MN Boiler license 2024 Exam Questions with Complete Solutions
1) In a natural draft furnance, the amount of draft is affected by the____. Heigh of the sack Size of the induced draft fan Size of the forced draft fan Boiler steam pressure “The correct answer is “”height of the stack.”” In a natural draft furnace, the amount of draft (the flow of air through the furnace) is influenced by the height of the stack. A taller stack creates a greater pressure difference between the inside and outside of the furnace, resulting in a stronger draft. This helps to ensure proper combustion and efficient operation of the furnace.”
2) What two scales does a pressure control have? 0 to 20 psi and 0 to 15 psi Cut in pressure and differential pressure 0 to 10 psi and 0 to 20 ps None of these A pressure control typically has two scales: cut-in pressure and differential pressure. Cut-in pressure refers to the minimum pressure at which the control starts to act, while differential pressure is the difference between the cut-in and cut-out pressures. The given answer correctly identifies these two scales, making it the correct choice.
3) What conditions are necessare to cause a furnace explosion? Too much aire Not enough air Accumulation of unburned fuel, oxygen and an igition source To much fuel A furnace explosion can occur when there is an accumulation of unburned fuel, oxygen, and an ignition source. If there is an excess amount of unburned fuel in the furnace, it can create a highly flammable environment. Additionally, the presence of oxygen is necessary for combustion to take place. Finally, an ignition source such as a spark or flame is needed to initiate the explosion. Therefore, all three conditions – accumulation of unburned fuel, oxygen, and an ignition source – are necessary for a furnace explosion to occur.
4) Can a low water condition occur in a hot water heating type boiler? No, because the boiler is completely filled with water Yes, for numerous reasons No , because there is water in the expansion tank For only test A low water condition can occur in a hot water heating type boiler for numerous reasons. Even though the boiler is initially filled with water, it is possible for the water level to drop below the required level due to leaks, evaporation, or improper maintenance. This can lead to overheating and potential damage to the boiler. Therefore, it is important to regularly monitor the water level in the boiler and take necessary measures to prevent a low water condition.
5) Heating surface is defined as: A hot surface The surface used for heating Water on one side hot gas on the other side. Make sure firing heat “The correct answer is “”Water on one side hot gas on the other side.”” This statement accurately defines heating surface as a surface where water is present on one side and hot gas is present on the other side. This arrangement allows for heat transfer from the hot gas to the water, resulting in heating.”
6) The purpose of the spring in safety valve is_____. Help lift the testing lever Help open the valve at blowing pressure Close the valve disc against the seat Force the valve to open at the correct pressure The purpose of the spring in a safety valve is to help open the valve at blowing pressure. The spring provides the necessary force to overcome the pressure inside the system and lift the valve disc, allowing the release of excess pressure. This ensures that the valve opens at the correct pressure, preventing any potential damage or hazards that may occur if the pressure exceeds safe limits.
7) In order form a fuel to burn it must be heated to: 212 f At least 1000 f Its ignition temperture 160 f “To form a fuel to burn, it must be heated to its ignition temperature. This is the minimum temperature required for the fuel to undergo combustion and start burning. Heating the fuel to a temperature below its ignition temperature will not initiate the burning process. Therefore, the correct answer is “”Its ignition temperature.”””
8) When hot combustion gases travel through boiler tubes that are surrounded by boiler water, the boiler is called a _ Boiler. Watertube Cast Iron High-return temperature Firetube “A firetube boiler is a type of boiler where hot combustion gases pass through tubes that are surrounded by boiler water. In this design, the heat from the gases is transferred to the water, resulting in the production of steam. This type of boiler is commonly used in industrial applications where high steam production is required. The other options mentioned, such as watertube and cast iron boilers, have different designs and mechanisms for heat transfer. The term “”high-return temperature”” does not accurately describe the type of boiler.” 9) Vacuum is expressed in what? 2 or more Inches of mercury (HG) “The weight of water per vertical foot (.433 psi per vertical foot) H = V x .433 = PSI” Both A and B Vacuum in a boiler system is typically expressed in inches of mercury (inHg) or as the weight of water per vertical foot, which is approximately 0.433 psi per vertical foot. So, both options A and B are correct ways to express vacuum in a boiler context.
10) Modulating combustion controls_____. Regulate the steam and feedwater supply Regulate the burner firing rate Control the oil atomizer Control the backdraft damper Modulating combustion controls are responsible for regulating the steam and feedwater supply in a combustion system. These controls adjust the flow of steam and feedwater to maintain the desired temperature and pressure levels in the system. By modulating the supply, the controls ensure that the combustion process is optimized for efficiency and safety. This helps to maintain a stable and controlled combustion process, resulting in efficient energy production.
11) In accordance with the ststutes of State of Minnesota, one boiler horsepower for steam-coil-type generators is equal to . 100 cu ft of natural gas consumed 5 sq ft of boiler heating surface 10 sq ft of boiler heating surface 100 sq ft of boiler heating surface According to the statutes of the State of Minnesota, one boiler horsepower for steam-coil-type generators is equal to 5 sq ft of boiler heating surface. 12) is the flow of air or gases of comustion caused by a difference in pressure between two points. Flow Draft Furnance velocity Uptake Draft is the correct answer because it refers to the flow of air or gases of combustion caused by a difference in pressure between two points. It is commonly used in the context of ventilation systems or chimneys, where the difference in pressure creates a flow of air or gases. The other options, such as flow, furnace velocity, and uptake, do not specifically refer to this concept of pressure-induced airflow.
13) The main purpose of installing insulation on steam system piping is to____. Prevent heat loss Give the pipe a neat appearance Prevent injury to personnel due to contact with the hot surfaces of the pipe Provide a surface that will retain paint Insulation is installed on steam system piping primarily to prevent heat loss. This is important because steam carries thermal energy, and if the heat is allowed to escape from the pipes, it can result in energy wastage and reduced efficiency of the system. Insulation helps to maintain the desired temperature of the steam and prevents it from cooling down too quickly. It also helps to conserve energy and reduce operating costs.
14) A siphon tube is necessary to_____. Prevent steam from reaching the safety valve disc Prevent water from entering a steam gauge Drain water from a bourdon tube Keep steam out of a bourdon tube A siphon tube is necessary to prevent water from entering a steam gauge. This is because steam gauges are designed to measure the pressure of steam, and if water were to enter the gauge, it could cause damage or inaccurate readings. The siphon tube helps to create a barrier between the steam and the gauge, allowing only steam to pass through and preventing any water from entering.
15) The combustion elements in the fuels are—–. carbon hydrogen Carbon , nitrogen Ash, hydrogen Mercury, ash, carbon, hydrogen The correct answer is carbon and hydrogen. Combustion is a chemical reaction that occurs when a fuel combines with oxygen to produce heat and light. In this process, the carbon and hydrogen atoms in the fuel are oxidized, releasing energy. Therefore, carbon and hydrogen are the essential elements present in fuels for combustion to occur.
16) A test connection between the siphon tube and the boiler pressure gauge is need to . Unplug the siphone tube when the boiler is in operation A test sample of steam for carryover and purity Be abble to clean the siphon Test steam temperture at the pressure shown on the gauge The test connection between the siphon tube and the boiler pressure gauge is needed to test the steam temperature at the pressure shown on the gauge. This connection allows for accurate measurement of the steam temperature and ensures that it is consistent with the pressure indicated on the gauge. This is important for monitoring and maintaining the proper functioning of the boiler system. 17) In a steam boiler system, the unit that turns the burner on and off based on steam pressure is the Aqustat bpressure control Pressure control Potentiomete Modulator control The correct answer is Pressure control. In a steam boiler system, the pressure control unit is responsible for turning the burner on and off based on the steam pressure. It monitors the pressure levels and activates the burner when the pressure falls below a certain threshold, ensuring that there is enough steam to meet the demand. Similarly, it shuts off the burner when the pressure exceeds a certain limit to prevent any damage or unsafe conditions. The pressure control unit plays a crucial role in maintaining the optimal pressure levels in the steam boiler system. 18) When a safety valve opens and closes rapidly it is referred to as: a chatteringb poppingc blow backd pressuring Chattering Popping Blow Back Pressuring Chattering is the correct answer because when a safety valve opens and closes rapidly, it produces a chattering sound. This can occur due to high pressure fluctuations or mechanical issues with the valve. Chattering can be harmful as it can cause damage to the valve and compromise its effectiveness in relieving excess pressure. 19) A high pressure boiler of 25 HP should be checked every? 4 hours 8 Hours 24 Hours 48 hours A high pressure boiler of 25 HP should be checked every 24 hours. This is because high pressure boilers require regular monitoring and maintenance to ensure their safe and efficient operation. Checking the boiler every 24 hours allows for timely detection of any potential issues or malfunctions, allowing for prompt repairs or adjustments to be made. Regular checks also help to ensure that the boiler is operating within safe parameters, minimizing the risk of accidents or failures. 20) Try lever test (safety valve) must be tested every days? Performed to determine if a safety valve opens at the proper pressure within allowable tolerances and should be performed annuallyl. A bent tube between the boiler and boiler fitting that provides a water seal to prevent contact with steam. 30 days with the boiler at a minimum of 75% of the safety valve set pressure. The last 4 Hours The lever test, also known as the safety valve test, is performed to ensure that a safety valve opens at the correct pressure within acceptable limits. This test should be conducted annually. According to the given answer, the lever test should be performed every 30 days, with the boiler operating at a minimum of 75% of the safety valve set pressure. This frequency ensures that the safety valve is regularly checked and remains in proper working condition to prevent any potential hazards.
21) Air that is mixed with the fuel at / or in the burner is called: Secondary air Primary air Mixable air Excess Air Primary air refers to the air that is mixed with the fuel at or in the burner. It is the initial air supply that is required for the combustion process to take place. Primary air helps in the proper mixing of fuel and air, ensuring efficient and controlled combustion. It plays a crucial role in determining the flame stability, flame shape, and overall combustion performance.
22) The correct procedure for blowing down a high pressure boiler is to open_____. The quick-opening valve first and close it last The slow-opening valve first and close it last Both blowdown valves partway at first to warm up blowdown lines The check valve first and then glove valve The correct procedure for blowing down a high pressure boiler is to open the quick-opening valve first and close it last. This is because the quick-opening valve allows for a rapid release of pressure and water from the boiler, which helps to remove any sediment or impurities. By opening it first, any buildup or blockages can be cleared effectively. Closing it last ensures that all the blowdown process is complete and the system is properly drained.
23) A Special Engineer is expected to be competent, take charge of, and be responsible for the safe operation and maintenance of all classes of boiler of not more than HP and their appurtenances. 50 100 25 175 A Special Engineer is responsible for the safe operation and maintenance of boilers. The maximum horsepower (HP) limit for the boilers that a Special Engineer can handle is not more than 50 HP. This means that they are expected to have the necessary competence and take charge of ensuring the safe operation and maintenance of boilers up to this horsepower capacity.
24) What is the minimum size drain required on a water colum? 1 inch 3/4 inc 1/2 inch 1/4 inc The minimum size drain required on a water column is 3/4 inch. This means that the drain should have a diameter of 3/4 inch in order to effectively drain the water column.
25) The purpose of a steam trap is to____. Allow air to accumulate in the steam line Prevent steam from flowing in the steam line Remove air and condensate from stean line Allow water in the steam lines to accumulate A steam trap is a device used in steam systems to remove air and condensate from the steam line. As steam condenses into water, it can cause damage to the system and reduce its efficiency. The steam trap helps to remove this condensate and any air present in the line, ensuring that only steam flows through the system. This helps to maintain the proper functioning of the steam system and prevent any potential damage or inefficiencies.
26) A low-water cutoof (LWCO) prevents boiler damage by_____. Cutting off the fuel supply to prevent overheating of any part of the furnance Cutting off the fuel supply to the boiler until normal water level is restored, then automatically restarting the fuel supply Reducing the fuel supply in proportion to a reduced feedwater suplly Reducing feedwater supply when the fuel supply is low A low-water cutoff (LWCO) prevents boiler damage by cutting off the fuel supply to prevent overheating of any part of the furnace. This is important because if the water level in the boiler drops too low, it can expose the heating surfaces and cause them to overheat, leading to potential damage or even failure of the boiler. By cutting off the fuel supply, the LWCO ensures that the boiler does not continue to operate without sufficient water, protecting it from overheating and potential damage.
27) The shief engineer of a high pressure boiler plant of over 200 HP must stay within______of the boiler room at all times during the shief. 500 ft 100 ft 1500 ft 2000 ft The chief engineer of a high-pressure boiler plant of over 200 HP must stay within 500 ft of the boiler room at all times during the shift. This distance requirement ensures that the chief engineer is in close proximity to the boiler room, allowing them to monitor and respond to any potential issues or emergencies promptly. It also ensures that the chief engineer can easily access the necessary equipment and resources in case of any maintenance or operational needs. By staying within 500 ft of the boiler room, the chief engineer can effectively oversee the operations and safety of the boiler plant.
28) Vacuum is expressed in what? Centimetres in hours 5 inches Inches of mercury (HG) Pull the steam The correct answer is inches of mercury (HG). This is because vacuum is commonly expressed in inches of mercury (HG), which refers to the measurement of the pressure exerted by a vacuum. It is a unit of measurement used to describe the level of vacuum in various systems and is often used in industries such as engineering and physics.
29) The boiling point of water within a pressurized boiler will_____. Increase as the pressure in the boiler increases Increase as the pressure in the boiler decreases Always be 212 0F Be lower or higher depending on the altitude The boiling point of water in a pressurized boiler increases as the pressure inside the boiler increases. This is a well-established principle in thermodynamics, where higher pressure leads to a higher boiling point for a given substance. In summary, as the pressure goes up, the boiling point of water within the boiler also goes up.
30) On a steam or hot boiler, the safety valve or safety relief valve could be tested by? They do not need to be tsted Lifting the lever on the valve or raising the pressure until they operate Increase the temperature until they operate Decrease temperature when boiler is fire The correct answer is lifting the lever on the valve or raising the pressure until they operate. Safety valves or safety relief valves on steam or hot boilers need to be tested periodically to ensure that they are functioning properly. This can be done by manually lifting the lever on the valve or by increasing the pressure until the valve operates and releases the excess pressure. This testing is important to ensure the safety of the boiler and prevent any potential accidents or damage.
31) Try cocks on a water calumn are used to_____. Check the temperture of the water in the column Blow down the water coumn check the water level in the boiler Blow down impurities from the column Cocks on a water column are used to check the water level in the boiler. These cocks are valves that allow operators to visually inspect the water level and ensure it is at the desired level for safe and efficient operation of the boiler.
32) The first sequence in the series of automatic bgurner controls is: Igniction Purging To make up the gas switch Startup on low fire “The correct answer is “”purging”” because in the sequence of automatic burner controls, purging is the first step that occurs before ignition. Purging refers to the process of removing any residual gas or air from the combustion chamber to ensure a safe and efficient ignition. Once purging is complete, the ignition process can take place, followed by making up the gas switch and finally starting up the burner on low fire.”
33) Why is a pigtail or siphon required in steam pressure gauge lines? To prevent water hammer To protect the gauge from a high temperature To reduce the pressure Fusion on the boiler A pigtail or siphon is required in steam pressure gauge lines to protect the gauge from a high temperature. Steam can reach very high temperatures, and without a pigtail or siphon, the hot steam could directly come in contact with the gauge, causing damage or inaccurate readings. The pigtail or siphon acts as a barrier, allowing the steam to cool down before reaching the gauge, ensuring its proper functioning and longevity.
34) Sensible heat is_________. The sum of latent heat plus the heat of evaporation Not a form of energy Able to cause a change in temperature The heat of fusion Sensible heat refers to the heat energy that is transferred to or from a substance, resulting in a change in its temperature. It is the heat energy that can be sensed or felt. Unlike latent heat, which is associated with phase changes (such as the heat of evaporation or fusion), sensible heat directly affects the temperature of a substance. Therefore, it is able to cause a change in temperature.
35) What is the minimum size bottom blowdown line used on a mini or miniature boiler? 1/4 inch 1/2 inc 3/4 inch 1 inch The minimum size bottom blowdown line used on a mini or miniature boiler is 1/2 inch.
36) The document governing boiler fitting and valves is the____code. ASME National Boiler Pressure Valve ASHRAE The correct answer is ASME. ASME stands for the American Society of Mechanical Engineers, which is responsible for developing and maintaining standards and codes for various mechanical engineering practices. ASME Boiler and Pressure Vessel Code specifically governs the design, fabrication, and inspection of boilers, pressure vessels, and related equipment. Therefore, ASME is the appropriate code for governing boiler fitting and valves.
37) High Pressure Boiler has MAWP of 15 PSI and over 6 boiler horsepower 35.4 Lbs Control for special action 160 PSI “The correct answer is “”15 PSI and over 6 boiler horsepower.”” This is because a High Pressure Boiler is defined as a boiler that operates at a pressure greater than 15 pounds per square inch (PSI) and has a power output of over 6 boiler horsepower. Therefore, any boiler that meets both of these criteria can be classified as a High Pressure Boiler.”
38) Rules goerning the construction of power boiler are set out in_____. ASME Code Section I ASME Code Section II ASME Code Section Viii, Division 1 CSA B-51 The correct answer is ASME Code Section I. This section of the ASME Code specifically deals with the construction of power boilers. It provides guidelines and regulations for the design, fabrication, installation, inspection, and testing of power boilers. It ensures that power boilers are constructed in a safe and reliable manner, meeting all necessary standards and requirements.
39) If wate in the gauge glass is not visible because of failure of the feed water supply, what should be done? Add water immediately through the manual fill line Shut off the fuel to the burner and secure the boiler Notify the boiler inspector but continue to run the boiler Notify to the sherief In the given situation, if the water in the gauge glass is not visible due to a failure in the feed water supply, it indicates a potential danger. Shutting off the fuel to the burner and securing the boiler is the correct course of action to prevent any further damage or accidents. This will stop the heat source and ensure the boiler is not operating without sufficient water supply. Notifying the boiler inspector is also important for further investigation and necessary repairs.
40) The main purpose for chemically treating boiler feedwater is to_____. Prevent rust from forming on the boiler outside surface Increase heat transfer Produce cleaner steam Protect the boiler internal surfaces from the impurities in feedwater The main purpose for chemically treating boiler feedwater is to protect the boiler internal surfaces from the impurities in feedwater. This is because impurities in the feedwater can cause scaling, corrosion, and fouling on the internal surfaces of the boiler, which can reduce its efficiency and lifespan. By treating the feedwater chemically, these impurities can be controlled and prevented from causing damage to the boiler.
41) A watertube boiler is a boiler that has_____. Water on the outside of the tubes and hot gas on the inside of the tubes Water on inside of the tubes and hot gas on the outside of the tubes Cold water on the outside the tubes and hot water on the inside of the tubes Cold air on the outside of the tubes and hot gases on the inside of the tubes A watertube boiler is a type of boiler that has water flowing inside the tubes while hot gases or flames surround the outside of the tubes. This design allows for efficient heat transfer and steam generation.
42) When heat is tranferred by the flow of fluids, it is know as_____. Radiation Convection Conduction Excavation Convection is the correct answer because it refers to the transfer of heat through the movement of fluids, such as liquids or gases. In convection, heat is transferred by the circulation of the fluid, which causes warmer particles to rise and cooler particles to sink, creating a continuous flow. This process is commonly observed in everyday life, such as when heat is transferred from a stove to a pot of water or when warm air rises and cool air sinks in a room.
43) The feedwater line cotain_____. Check valve between a stop valve the rest of feedwater line Check valve between a stop valve and a boiler Stop valve only Two syop valves “The correct answer is “”check valve between a stop valve and a boiler””. This means that the feedwater line contains a check valve, which is a type of valve that allows the flow of fluid in one direction only. It is located between a stop valve and a boiler, which ensures that water flows from the feedwater line into the boiler and prevents any backflow.”
44) What are trycocks used for? They are used to determine the water level in the boiler if the gauge glass is not working The quick opening valve is opened first and closed last Small particles of water are carried into the steam lines. Discharges water at a controlled rate to regulate proper chemical concentration in the boiler water. Trycocks are valves used to determine the water level in the boiler when the gauge glass is not functioning properly. By opening the trycocks, the operator can visually inspect the water level and ensure it is at the desired level for safe and efficient boiler operation. This is important as maintaining the correct water level helps prevent damage to the boiler and ensures optimal performance.
45) When heat transfer occurs by travelling through metal, it is known as . Radiation Conduction Convection Diffusuion When heat transfer occurs by traveling through metal, it is known as conduction. Conduction is the process of heat transfer through direct contact between particles or molecules within a material, such as a metal. In metals, heat is primarily transferred through the movement of free electrons, which carry thermal energy from the hotter region to the cooler region of the material.
46) The boiler heating surface__. Is smaller in watertube boiler than in the firetube Does not affect the capacity of a boiler Can be used to determine the boiler capacity Is smaller in firetube boiler than in watertube boiler The heating surface of a boiler refers to the area of the boiler that is exposed to the heat produced by the combustion of fuel. In general, the heating surface of a watertube boiler is smaller than that of a firetube boiler. This is because in a watertube boiler, the water is contained inside the tubes, which are surrounded by the hot gases. This allows for a more efficient transfer of heat from the gases to the water. In contrast, in a firetube boiler, the water surrounds the tubes, resulting in a larger heating surface area. Therefore, the statement that the heating surface is smaller in a watertube boiler than in a firetube boiler is correct.
47) The most important valve on a boiler is the_____ Valve. Check Safety Blowdown Drain The most important valve on a boiler is the safety valve because it is responsible for releasing excess pressure that could potentially cause an explosion. This valve is designed to automatically open when the pressure inside the boiler exceeds a certain limit, ensuring the safety of the boiler and its surroundings. Without a functioning safety valve, the boiler could become highly dangerous and pose a serious risk to both property and human life.
48) _ is any solid impurity in water that cannot be dissolved. Ph Dissolved flocculant Suspended matter A dissolved solid Suspended matter refers to any solid impurity in water that cannot be dissolved. This can include particles such as silt, clay, or organic matter that remain suspended in the water without dissolving. These particles are typically larger in size and do not dissolve due to their insolubility. Suspended matter can affect the clarity and quality of water, and it is often removed through filtration or sedimentation processes. 49) On steam boiler what is used to reduce the amount of movement of the water so the operator can get reading of the water level in the gauge glass? Tricoks Water column Cross tee’s Level valve A water column is used to reduce the amount of movement of the water in a steam boiler. This allows the operator to obtain a clear and accurate reading of the water level in the gauge glass. The water column acts as a buffer, preventing rapid fluctuations in water level caused by the movement of steam and water within the boiler. It provides a stable and steady supply of water to the gauge glass, ensuring that the operator can easily monitor the water level. 50) The purpose of a valve on a steam boiler is to: To regulate and control an even amount os steam pressure To regulate the blow back To prevent the boiler from exceeding its MAWP To regulate pressure in the boiler The purpose of a valve on a steam boiler is to prevent the boiler from exceeding its MAWP (Maximum Allowable Working Pressure). This is important to ensure the safety of the boiler and prevent any potential damage or accidents. By regulating the pressure within the boiler, the valve helps maintain a safe operating condition and prevents any excessive pressure buildup. 51) The evaporative capacity of a steam boiler is stated as pound of steam per_. Second Minute Hour Day The evaporative capacity of a steam boiler is typically measured in terms of the amount of steam it can produce per hour. This measurement is important as it helps determine the efficiency and productivity of the boiler. By stating the evaporative capacity in pounds of steam per hour, it provides a standardized unit of measurement that allows for easy comparison and evaluation of different boilers.
52) A steam boiler operating control is used to control the_____. Steam pressure boiler Gas pressure to the burner Boiler furnance pressure Setpoint on the safety valve “The correct answer is “”setpoint on the safety valve.”” A steam boiler operating control is responsible for maintaining the desired pressure within the boiler. It does this by adjusting the setpoint on the safety valve, which is the point at which the valve opens to release excess pressure. By controlling the setpoint, the operating control ensures that the pressure in the boiler remains within safe limits, preventing any potential damage or accidents.”
53) What is the function of an automatic city water city feeder on a low pressure boiler? To add water to the feed water tank To control the water level of the tank To cool the boiler water dow To take action to put water in te boiler The function of an automatic city water feeder on a low pressure boiler is to control the water level of the tank. This device is responsible for monitoring the water level in the tank and automatically adding water when necessary to maintain the desired level. It helps to ensure that the boiler always has enough water to operate efficiently and safely.
54) Before filling a boiler with water, the licensed engenieer should ensure that_____. Tha bowdown valves are open The safety valves is gagged The flame scanner has been tested The feedwater temperature is at least 211 farangith Before filling a boiler with water, the licensed engineer should ensure that the flame scanner has been tested. This is important because the flame scanner is responsible for detecting the presence and quality of the flame inside the boiler. Testing the flame scanner ensures that it is functioning properly and can accurately detect any issues with the flame, such as instability or extinguishment. This helps to prevent potential hazards and ensures the safe operation of the boiler.
55) A hydrostatic test is a mandatory requirement when a new boiler is installed in the State of minnesot. The test pressure requirement must no exceed _ time the maximum allowable working pressure. 1.2 1.5 2.0 3.0 The hydrostatic test is a necessary procedure for new boiler installations in Minnesota. During this test, the pressure is increased to ensure that the boiler can withstand the maximum allowable working pressure. The test pressure requirement should not exceed 1.5 times the maximum allowable working pressure. This ensures a safety margin and ensures that the boiler is capable of operating under normal conditions without any risk of failure due to excessive pressure. 56) Why is a safety valve sealed? To prevent damage to the safety valve To prevent tampering with pressure and capacity To allow for blow back To protect to spring The safety valve is sealed to prevent tampering with pressure and capacity. This ensures that the valve operates at the correct pressure and capacity, which is crucial for maintaining the safety of the system or equipment it is installed in. If the valve is tampered with, it could lead to incorrect pressure levels or capacity, potentially causing damage or accidents. By sealing the valve, unauthorized individuals are prevented from making any adjustments that could compromise the safety and functionality of the system. 57) The minnimun passing score for a Minnesota engineer’s license examination si__%. 50 60 70 80 The minimum passing score for a Minnesota engineer’s license examination is 70%. This means that in order to obtain an engineer’s license in Minnesota, a candidate must achieve a score of at least 70% on the examination.
58) “With regard to steam boiler, the letters “”HRT”” mean_____.” Highly regulated temperature Hot return tubes Horizontal return tubular Highly regulated treatment “The letters “”HRT”” in the context of a steam boiler refer to “”Horizontal return tubular.”” This term describes a specific type of boiler design where the flue gases travel horizontally through a series of tubes before returning to the front of the boiler. This design allows for efficient heat transfer and is commonly used in small to medium-sized boilers.”
59) When used, a quick-opening blowdown valve be located_______. Nearest to the boiler On top of safety valve Nearest of the exit Close to the steam drum A quick-opening blowdown valve should be located nearest to the boiler because it is used to rapidly remove impurities and sediment from the boiler water. By placing it closest to the boiler, it allows for efficient and immediate discharge of the water, preventing any build-up of harmful substances.
60) The safety valve test must not be used unless_____. Another licensed engineer is present The boiler inspector rquest it There is no load on the boiler The pressure is at about 75% of valve popping pressure The safety valve test should not be performed unless another licensed engineer is present. This is important because safety valve testing involves releasing high pressure steam, which can be dangerous if not handled properly. Having another licensed engineer present ensures that there is an experienced professional who can assist and supervise the test, minimizing the risk of accidents and ensuring the safety of everyone involved.
61) A low-water fuel cutoff (LWCO) is used on a boiler to prevent_____. Damage to the radial stays in the steam dome The fire from shutting off too quickly and damaging the boiler Shutting off the water when there is no fuel Damage due to burner overfiring The low-water fuel cutoff (LWCO) is used on a boiler to prevent damage due to burner overfiring. This safety device is designed to shut off the burner when the water level in the boiler drops below a certain point. If the burner continues to fire without sufficient water, it can cause overheating and damage to the boiler. The LWCO helps to protect the boiler from this potential harm by shutting off the burner before it can overfire.
62) Black smoke can be caused by_____. Isufficient combustion air Boiler pressure that is to high Too much nitrogen in the air Too much carbon in the fuel Black smoke can be caused by insufficient combustion air. When there is not enough air available for combustion, the fuel does not burn completely, resulting in the production of black smoke. This can occur in various combustion processes, such as in boilers or engines. The incomplete combustion leads to the release of unburned carbon particles, which appear as black smoke. Increasing the supply of combustion air can help to ensure more complete combustion and reduce the formation of black smoke.
63) Boiler Stays_____. Are used to support tube sheets in a boiler Are used in the watertube boilers only Have to be replaced every two years Are used to anchor the boiler to the floor Boiler stays are used to support tube sheets in a boiler. Tube sheets are important components in a boiler that hold the tubes in place. The stays provide additional support to ensure that the tube sheets remain stable and secure. Without the stays, the tube sheets may become weak and fail, leading to potential safety hazards and operational issues. Therefore, it is essential to use boiler stays to support the tube sheets and maintain the integrity of the boiler system.
64) The maerial used most frequently for piping is____. Noferrous Cast iron Stainless steel Low carbon steel Stainless steel is the material used most frequently for piping due to its excellent corrosion resistance, durability, and strength. It is resistant to rust, stains, and oxidation, making it suitable for various applications, including water supply, gas lines, and chemical processing. Stainless steel pipes also have a smooth inner surface, which helps to reduce friction and improve flow efficiency. Additionally, stainless steel is easy to clean and maintain, making it a popular choice in industries where hygiene is crucial, such as food and pharmaceuticals.
65) Boiler water with a PH of 6 is considered_____. Alkaline Basic Acid Neutral Boiler water with a pH of 6 is considered acidic. The pH scale ranges from 0 to 14, with 7 being neutral. Anything below 7 is considered acidic, while anything above 7 is considered alkaline or basic. Since the pH of 6 is below 7, it falls into the acidic range.
66) The maximum pressure allowed in a low pressure hot water boiler is no more than psig. 5 15 25 160 The maximum pressure allowed in a low pressure hot water boiler is 160 psig. This means that the pressure inside the boiler should not exceed 160 pounds per square inch gauge. This limit is set to ensure the safety and proper functioning of the boiler, as exceeding this pressure could lead to damage or even explosion. 67) The funtion of a flame device is to shut off the . Fuel supply when the pressure gets too high Fuel supply when the burner flame goes out Fuel supple when the fuel temperture is high Feedwater supply to the boiler when the fuel supply fails “The correct answer is “”fuel supply when the burner flame goes out””. A flame device is designed to detect the presence of a burner flame. If the flame goes out, it signals the device to shut off the fuel supply, preventing any potential hazards or accidents. This ensures that the fuel is not continuously flowing without a flame, which could lead to gas leaks or other dangerous situations.”
68) In accordance with the statutes of the State of Minnesota, each electric boiler horsepower is equal to________Kilowatts. 10 32.5 100 760 According to the statutes of the State of Minnesota, each electric boiler horsepower is equal to 10 Kilowatts.
69) Improper drainage of steam lines could_____. Cause low pressure in the steam lines Cause high pressure in the steam lines Result in low steam flow Result in high steam flow Improper drainage of steam lines can result in high steam flow. When steam lines are not properly drained, condensate can accumulate and restrict the flow of steam. This accumulation of condensate can cause an increase in pressure within the steam lines, leading to a higher steam flow.
70) A way to determine is safety vlave on a boiler has sufficient capacity is to_______. Check the valve laber Check the boiler Inspector Lift the test lever Check with the ASME Code To determine if a safety valve on a boiler has sufficient capacity, one should check with the ASME Code. The ASME Code sets the standards and regulations for the design, construction, and operation of boilers and pressure vessels. It provides guidelines for the sizing and selection of safety valves based on factors such as the boiler’s capacity, pressure, and type. By checking with the ASME Code, one can ensure that the safety valve meets the required capacity to effectively protect the boiler from overpressure situations.
71) Each boiler in a battery (piped together sharing the same common header) must have: Two or more safety valves on each boiler A main steam stop A chimney and breeching to each boiler Two or more types of fuel A main steam stop is necessary in each boiler in a battery because it allows for the control and regulation of the flow of steam. This stop valve is essential for shutting off the supply of steam to the system, preventing any potential accidents or damage. It serves as a safety measure to ensure that the steam flow can be quickly and effectively stopped when needed.
72) As steam pressure increases, there is a correponding increase in the . Boiling temperature of the water in the boiler Amount of superheat from the boiler Quality os steam discharged from the boiler Stack temperture As steam pressure increases, there is a corresponding increase in the boiling temperature of the water in the boiler. This is because higher pressure raises the boiling point of water, causing it to require more heat to reach its boiling temperature. Therefore, as the steam pressure increases, the boiling temperature of the water in the boiler also increases. 73) The ph of the boiler water should be kept. Neutral Slightly acidic At 10.0 to 11.5 7.0 to 8.8 The pH of the boiler water should be kept neutral to prevent corrosion and scale formation. A neutral pH helps to maintain the balance between acidity and alkalinity, ensuring the water does not become too acidic or alkaline. This is important as acidic water can cause corrosion of the boiler components, while alkaline water can lead to scale buildup. Therefore, maintaining a neutral pH level is crucial for the efficient and safe operation of the boiler.
74) What is the internal resistance to the flow of fuel oil? Flash Pint Viscosity Option 3 Fire point Viscosity is the correct answer because it refers to the internal resistance to the flow of fuel oil. Viscosity is a measure of a fluid’s resistance to flow, and it determines how easily the fuel oil can flow through pipes, valves, and other components of a fuel system. A higher viscosity indicates a thicker and more resistant fluid, while a lower viscosity indicates a thinner and less resistant fluid. Therefore, the viscosity of fuel oil directly affects its ability to flow efficiently within a system.
75) A check valve is a valve that_____. Shuts off flow after a predetermined time Allows flow in two directions Allows flow a regular intervals Allows flow in one direction only A check valve is a type of valve that allows the flow of fluid or gas in one direction only. It is designed to prevent backflow or reverse flow, ensuring that the fluid or gas can only move in a single direction. This is achieved through the use of a mechanism that closes the valve when the flow tries to reverse. Check valves are commonly used in plumbing systems, oil and gas pipelines, and various industrial applications to prevent the unwanted backflow of fluids.
76) Boiler equipped with 2 LWCO’s must have what on the auxiliary LWCO? Alarm Manual reset Flow Switch Check valve A boiler equipped with 2 Low Water Cut Offs (LWCOs) must have a manual reset on the auxiliary LWCO. This means that if the water level falls below the set point on the auxiliary LWCO, it will not automatically reset itself. Instead, a manual action is required to reset the LWCO and restore the boiler’s operation. This is an important safety feature as it ensures that any issues with the water level are properly addressed and not ignored or overlooked.
77) What device prevents city water from flowing back to the city supply Backflow Preventer Safty Valave Low water cut off Siphon A backflow preventer is a device that prevents city water from flowing back into the city supply. It is designed to protect the public water supply from potential contaminants or pollutants that may enter the water system due to backflow. Backflow can occur when there is a change in pressure in the water supply system, causing water to flow in the opposite direction. The backflow preventer ensures that water only flows in one direction, preventing any contamination of the city water supply.
78) A high pressure boiler must have two means of feet water supply if it exceeds HP. 50 100 175 500 A high pressure boiler must have two means of feed water supply if it exceeds 50 HP or 500 square feet. This means that if the boiler has a horsepower rating greater than 500, it is required to have two separate methods for supplying water. This is likely to ensure that there is a backup system in place in case one supply method fails, ensuring continuous operation and safety of the boiler.
79) MAWP is measured in Pound per hours PSI pounds per square inch Option 3 LBS by pression The correct answer is PSI pounds per square inch. PSI is the unit of measurement for pressure, specifically the amount of force exerted on a surface area of one square inch. This unit is commonly used to measure the maximum allowable working pressure (MAWP) of a system or equipment, such as in industrial applications or for pressure vessels. The other options mentioned, such as pound per hours (Pound/h) and LBS by pression, are not correct units for measuring pressure and are unrelated to MAWP.
80) The low-water cotoff (LWCO) is a divice fitted to the boiler to shut off the____. Fedd water supply is the fuel supply is to low Feed water supply is the boiler pressure becomes too high Fuel supply to the burners when water level in the boiler is low Fuel supply when water temperture is below normal The low-water cutoff (LWCO) is a device fitted to the boiler to shut off the fuel supply to the burners when the water level in the boiler is low. This is important because if the water level in the boiler drops too low, it can expose the heating surfaces to excessive heat, leading to potential damage or even a boiler explosion. By shutting off the fuel supply, the LWCO helps prevent this dangerous situation and ensures the boiler operates safely.
81) Combustion is_____. Chemical combination of incompatible chemicals in contact with each other Chemical combination of the elements of fuel with oxygen Spontaneos reaction of toxic or hazardous materials Chemical carbon absorption preocess Combustion is the chemical combination of the elements of fuel with oxygen. During combustion, a fuel (such as wood, gasoline, or natural gas) reacts with oxygen in the presence of heat to produce carbon dioxide, water, and energy. This process is commonly used to generate heat or power in various applications, such as in engines or heating systems.
82) The best method of testing a low-water fuel cutoff (LWCO) is to______. Blow the low-water fuel cutoff down through the water column until the burner shuts off. Lower the water level in the boiler to the level where the burner should cut out Manually trip the cutoff linkage to shut off the burner Blow down the float chamber to determine in the burner will cut out The best method of testing a low-water fuel cutoff (LWCO) is to blow down the float chamber to determine if the burner will cut out. This involves releasing some water from the float chamber to simulate a low-water condition. If the LWCO is functioning properly, it should detect the low water level and shut off the burner to prevent any damage or accidents. This method allows for a controlled test without actually lowering the water level in the boiler or manually tripping the cutoff linkage.
83) What is the unit called that controls the starting and stopping of the burner by sensing the temperature of the water in a hot water boiler? Aqua stat Pressure troll Vapor stat Flow control valve The unit that controls the starting and stopping of the burner by sensing the temperature of the water in a hot water boiler is called an aqua stat. It is responsible for maintaining the desired temperature by regulating the burner operation based on the water temperature.
84) The first and most important task for the boiler operator when entering a boiler room is to check the _ of all boiler on line. Water level Flame condition Pump operation Check valve is open When entering a boiler room, the first and most important task for the boiler operator is to check the water level of all boilers online. This is crucial because maintaining the correct water level in a boiler is essential for its safe and efficient operation. If the water level is too low, it can expose the boiler’s heating surfaces, leading to overheating and potential damage. On the other hand, if the water level is too high, it can cause water carryover into the steam system, leading to water hammer and other operational issues. Therefore, regularly checking and maintaining the proper water level is critical for the safe and effective functioning of the boiler. 85) The evaporation of 34.5 pounds of water per hour from and at a temperature of 212 f is defined as: The latent heat of evaporation One boiler horsepower An evaporation Both evaporation and fusion One boiler horsepower is defined as the evaporation of 34.5 pounds of water per hour from and at a temperature of 212°F. This means that one boiler horsepower is the amount of heat energy required to convert 34.5 pounds of water into steam at 212°F in one hour. 86) Continuos blowdown systems are udes in boiler_. For hot water heating systems To help control the water level in the steam drum To help control the dissolved solids concentration To help in the reduction of gas impurities Continuos blowdown systems are used in boilers to help control the dissolved solids concentration. Dissolved solids in boiler water can lead to various problems such as scaling, corrosion, and foaming. By continuously removing a small amount of water from the boiler, the concentration of dissolved solids is reduced, ensuring that the water remains within acceptable limits. This helps to maintain the efficiency and longevity of the boiler system.
87) Which formula is used to determine the efficiecy of the boiler based on heat absorption? A swp = ts xt x eff output divided by the input e=mc squared Input divided by output The efficiency of the boiler based on heat absorption is determined by calculating the output divided by the input. This formula allows us to understand how effectively the boiler is absorbing and utilizing heat energy. By dividing the output (the amount of useful work or heat produced by the boiler) by the input (the amount of fuel or energy supplied to the boiler), we can determine the efficiency of the boiler in converting the input energy into useful output energy.
88) The float chamber of the low water fuel cutoff (LWCO) is frequently blown down to prevent the_____. Float chamber from collecting sediment Electrict wiring from deteriorating Mercury switch from oxidizing Float from moving The float chamber of the low water fuel cutoff (LWCO) is frequently blown down to prevent sediment from collecting in it. This is important because if sediment collects in the float chamber, it can interfere with the proper functioning of the LWCO. The sediment can cause the float to become stuck or hinder its movement, which can lead to incorrect water level readings and potentially result in a failure of the LWCO to shut off the fuel supply when the water level is too low. Regularly blowing down the float chamber helps to prevent sediment buildup and ensures the LWCO operates effectively.
89) A gauge glass can be attached to a______Column, wich is attached to a boiler. Pressure Alarm Water Level A gauge glass can be attached to a water column, which is attached to a boiler. This allows for the monitoring and measurement of the water level in the boiler. By having a gauge glass attached to the water column, operators can easily see the water level and ensure that it is at the appropriate level for safe and efficient boiler operation.
90) Large high pressure utility boiler use_______ Natural Draft Balance Draft Induced draft Forced Draft Large high pressure utility boilers use natural draft for several reasons. Natural draft relies on the buoyancy of hot gases to create a pressure difference, which allows for the removal of combustion products and the supply of fresh air. This method is cost-effective, as it does not require additional mechanical equipment. Additionally, natural draft provides a stable and reliable flow of air, ensuring efficient combustion and heat transfer.
91) A high pressure boiler have two means of feed water supply if it exceeds_____horsepower: 50 100 125 500 A high pressure boiler requires two means of feed water supply if it exceeds 50 horsepower. This is likely because high pressure boilers operate at higher pressures and temperatures, which can result in a higher demand for water. Having two means of feed water supply ensures that there is a backup system in place in case one fails or is unable to meet the demand. This helps to maintain the safe and efficient operation of the boiler.
92) Valve should be used if a valve is required in a steam line from throttling action. Gate Check Plug Globe A globe valve should be used if a valve is required in a steam line for throttling action. Globe valves are designed to regulate flow by gradually opening or closing the valve, allowing for precise control of the fluid passing through. They are commonly used in applications where throttling or regulating the flow is necessary, such as in steam lines. Unlike gate valves, which are mainly used for full flow or shut-off, globe valves provide better control and can handle the high pressures and temperatures typically found in steam lines. Therefore, a globe valve is the correct choice in this scenario. 93) Furnace explosings are caused by a build up of combustible gases, or vapors in the combustion chamber, what is the term used to remedy this condition? Clearing Moduling Purging Huddling Purging is the term used to remedy the condition of a build-up of combustible gases or vapors in the combustion chamber of a furnace. Purging involves removing or clearing out these gases by introducing a flow of fresh air or inert gas into the chamber. This process helps to prevent any potential explosions or hazards that may occur due to the accumulation of combustible substances. 94) A cross tee fitting is used on boiler column connections to. Ensure heavy fitting are used Allow for easier draining Install vent valves Access the connecting piping for cleaning A cross tee fitting is used on boiler column connections to access the connecting piping for cleaning. This allows for maintenance and cleaning of the pipes connected to the boiler, ensuring that they remain free from debris and blockages, which can be crucial for the proper functioning of the boiler system.
95) How often should safety valaves be tested on a low pressure boiler? Daily Annually Quaterly (90 days) Monthly Safety valves should be tested on a low-pressure boiler every quarter, or every 90 days. This regular testing ensures that the safety valves are functioning properly and can release excess pressure to prevent any potential accidents or damage. Testing them quarterly allows for timely identification and correction of any issues that may arise, ensuring the continued safety and efficiency of the boiler system.
96) How does a pressuretrol attahed to the steam space of a boiler control the burner operation? On pressure increase-stars the burner On pressure decrease – starts the burner Stops the burner when it up to temperature Starts the burner when it up the temperture A pressuretrol attached to the steam space of a boiler controls the burner operation by starting the burner when there is a decrease in pressure. When the pressure in the steam space decreases below a certain set point, the pressuretrol activates the burner to increase the pressure back to the desired level. This helps maintain the optimal pressure in the boiler and ensures efficient and safe operation.
97) A _ valve is valve that permits fluid flow in only one direction and closes automatically to prevent black flow Butterfy Gate Check Globe A check valve is a type of valve that allows fluid to flow in only one direction and automatically closes to prevent backflow. It is designed to ensure that fluid can only move in a single direction, preventing any reverse flow or backflow. This is achieved through a mechanism that closes the valve when the fluid tries to flow in the opposite direction, effectively blocking any backflow. 98) A_____blowdown is performed to remove sludge from a boiler Surface Water cloumn Botton Low water fuel cuoff A bottom blowdown is performed to remove sludge from a boiler. This process involves draining a small amount of water from the bottom of the boiler to remove any sediment or sludge that may have settled there. This helps to prevent the build-up of impurities and maintain the efficiency and performance of the boiler. 99) Minnesota state satatute defines a year as_ for low pressure boiler 1750 hrs 2000 hrs 12 months- to include the heating season 1250 hrs “The correct answer is “”12 months- to include the heating season.”” According to Minnesota state statute, a year for low pressure boilers is defined as 12 months, specifically to include the heating season. This means that the boilers must be maintained and operated for the duration of the heating season, which typically spans 12 months.”
100) In a boiler, heat is transferred from the burning fuel to the water by________. Convection, expansion, radiation Contraction, conduction, expansion Convection, conduction, radiation Radiation, contraction, conduction In a boiler, heat is transferred from the burning fuel to the water through convection, conduction, and radiation. Convection is the transfer of heat through the movement of fluids or gases, such as the hot gases rising and the cooler water sinking in the boiler. Conduction is the transfer of heat through direct contact, such as the hot metal of the boiler transferring heat to the water. Radiation is the transfer of heat through electromagnetic waves, such as the heat radiating from the burning fuel to the surrounding surfaces and the water.
101) Other that a safety relief valve what other safety device should be installed on a hot water heating boiler? City water fill valve Low water fuel cut out A feed water regulator One pass make sure only A low water fuel cut out is an essential safety device that should be installed on a hot water heating boiler. This device is designed to monitor the water level in the boiler and automatically shut off the fuel supply if the water level drops below a certain point. This is important because if the water level is too low, it can lead to overheating and potentially cause a boiler explosion. By installing a low water fuel cut out, it helps to prevent this dangerous situation and ensures the safe operation of the boiler.
102) “For the porpuse of the boiler and pressure vessel statutes, “”a year”” is considered to be a least_______hr.” 1200 1845 1960 2000 “The correct answer is 2000. In the context of the boiler and pressure vessel statutes, “”a year”” is considered to be at least 2000 hours. This means that any equipment covered by these statutes must operate for a minimum of 2000 hours per year to comply with the regulations.”
103) On a steam boiler system, why are bottom blow down valves installed at the lowest point of the waterside of boilers? To remove sludge and sediment To remove make up water To prevent corrosion Option 4 Bottom blow down valves are installed at the lowest point of the waterside of boilers to remove sludge and sediment. Sludge and sediment can accumulate at the bottom of the boiler over time, which can lead to reduced efficiency and potential damage to the boiler. By installing bottom blow down valves at the lowest point, these impurities can be periodically flushed out, ensuring the boiler operates at optimal conditions and minimizing the risk of corrosion and other issues.
104) A bottom blowdown system can be equipped with slow-opening and quick-opening valves, with the quick-opening valve located_____. Closest to the boiler opened first Farthest from the boiler and opened first Closest to the boiler and opened first Farthest fron the boiler and opened last In a bottom blowdown system, the quick-opening valve is located closest to the boiler and is opened first. This is because the quick-opening valve allows for a rapid release of high-pressure steam and water from the boiler, which helps to quickly remove impurities and sediment from the bottom of the boiler. Opening the quick-opening valve first ensures that the majority of the impurities are flushed out efficiently. The slow-opening valve, on the other hand, is opened last and allows for a slower and more controlled release of steam and water to prevent any sudden pressure changes in the boiler.
105) A logbook must be maintained in the boiler room by the_______. A chief engineer of operating engineer designee Owner Plant Manager Special Engineer A logbook must be maintained in the boiler room by the chief engineer or an operating engineer designee. This is because the logbook is a record of important information regarding the boiler’s operation, maintenance, and any incidents or repairs that occur. The chief engineer or their designee is responsible for overseeing the boiler room and ensuring its proper functioning, so it is their duty to keep the logbook updated and accurate. The logbook serves as a valuable resource for tracking the boiler’s performance and ensuring compliance with safety regulations.
106) Expantision bends or joins are installed in piping systems to____. Allow for correct piping drainage Alloe for pressure increases Allow for expansion and contraction of piping without causing damage Protect against water hammer damage Expansion bends or joints are installed in piping systems to allow for the expansion and contraction of the pipes without causing damage. As the temperature of the fluid inside the pipes changes, the pipes expand or contract. If there are no expansion joints, the pipes may become overstressed and can lead to leaks, cracks, or other forms of damage. Therefore, the purpose of these expansion joints is to accommodate the thermal expansion and contraction of the pipes, ensuring the integrity and longevity of the piping system.
107) When testing the LWFCO on steam boiler, the burner should be firing-why? To see if the flam pops To see if the burner shuts off To make sure the burner stars in the low fire position To control pin in the boiler The reason the burner should be firing when testing the LWFCO on a steam boiler is to see if the burner shuts off. This is important because the LWFCO (Low Water Fuel Cut-Off) is a safety feature that shuts off the burner if the water level in the boiler drops below a certain point. By testing if the burner shuts off when the LWFCO is activated, it ensures that the safety mechanism is functioning correctly and will prevent any potential accidents or damage caused by low water levels in the boiler.
108) According to the minnesota statutes, a high pressure boiler plant of 51 to 500 horsepower may be left in operation unattended by an operating for no more than_____consecutive hours when the permises are occupied by employees of the public? Two Three Four Six According to the Minnesota statutes, a high pressure boiler plant of 51 to 500 horsepower may be left in operation unattended by an operator for no more than two consecutive hours when the premises are occupied by employees of the public.
109) Foaming in a boiler may be caused by_____. A high concetration of dissolved solids in the boiler water Feedwater that is too soft A water level that is kept too low Boiler water that is too acidic Foaming in a boiler may be caused by a high concentration of dissolved solids in the boiler water. When the concentration of dissolved solids, such as salts and minerals, becomes too high, it can lead to the formation of foam. This foam can interfere with the normal operation of the boiler, causing issues such as reduced heat transfer efficiency, increased corrosion, and potential damage to the boiler system. Therefore, it is important to maintain proper water treatment and control the level of dissolved solids to prevent foaming in the boiler.
110) Licenses granted must be displayed in _. The Parking lot close to th exit A conspicuous place in the engine or boiler room The chief Engineer’s Office The plant Manager’s Office Licenses granted must be displayed in a conspicuous place in the engine or boiler room. This is important for safety and compliance purposes as it allows easy visibility and access to the licenses for inspection by authorities or relevant personnel. Placing the licenses in the engine or boiler room ensures that they are readily available for verification and also serves as a reminder for the operators to adhere to the necessary regulations and procedures.
111) In accordance with the statutes of the State of Minnesota , one Boiler horspawer for conventional boiler is equal to______. 10 cu of natural gas consumed 10 sq ft of boiler heating surface 25 sq ft of boiler tubing 1000 Btu per hour According to the statutes of the State of Minnesota, one Boiler horsepower for a conventional boiler is equal to 10 sq ft of boiler heating surface.
112) A hydrostactic test test is considered to be a____ test that is used to determine if the component works as designed. Tensile Bend Proof Destructive A hydrostatic test is considered to be a proof test that is used to determine if the component works as designed. This test involves filling the component with a liquid, usually water, and applying pressure to check for any leaks or failures. It is called a proof test because it provides evidence or proof that the component can withstand the intended operating conditions without any issues.
113) The purpose oh the lever on a safety valve is? To close the disc against the seat Adjus the valve blow down pressure to test the operation Force the valve open at the correct pressure The lever on a safety valve is used to test the operation of the valve. By manually operating the lever, the valve can be forced open at the correct pressure to ensure that it is functioning properly. This allows for regular testing and maintenance of the safety valve to ensure its reliability in case of an emergency.
114) For high pressure boiler, a year is defined as: 12 months 1000 hrs 2000 hrs 2500 hrs A high pressure boiler is a type of boiler that operates at a high pressure level. It requires regular maintenance and inspections to ensure its safe and efficient operation. The correct answer, 2000 hrs, suggests that for a high pressure boiler, a year is defined as the duration of 2000 hours. This means that the boiler should undergo maintenance and inspections every 2000 hours of operation to ensure its optimal performance and prevent any potential issues or breakdowns.
115) An example of the transfer of heat by radiation is_______. The heating effect of the sum on the earth Using an electric heater whit a fan The handle of frying pan becoming hot on a stove Siverware becoming hot in a diswashing machine Radiation is the transfer of heat in the form of electromagnetic waves, and the heating effect of the sun’s radiation on the Earth is a classic example of heat transfer by radiation. The other options involve different methods of heat transfer, such as conduction or convection.
116) Heat that brings about a change of sate without causing a change in temperature is_______. Measured by the thermometer The sum of sensible heat latent heat Called latent heat Called sensible heat “Latent heat refers to the heat energy absorbed or released during a phase change, such as the conversion of a substance from a solid to a liquid or from a liquid to a gas, without any change in temperature. It is called latent heat because it is hidden or “”latent”” within the substance and does not directly affect the temperature. This heat is responsible for the changes in state, such as melting or evaporation, and is measured separately from sensible heat, which is the heat that causes a change in temperature.”
117) In a steam boiler system, what is the term used for replacing the water that has been lost by blowing down the boiler or through leaks in the system? Make up water Concense Feed replacement Air supplies “In a steam boiler system, “”make up water”” is the term used for replacing the water that has been lost by blowing down the boiler or through leaks in the system. This is necessary to maintain the desired water level and pressure in the boiler.”
118) In a deaerator, dissolved gases are removed from the water by_____. Cooling water Forncing the water through organic screens and venting the gases to the atmosphere Scrubbing the feedwater through gravel beds Heating the water In a deaerator, dissolved gases are removed from the water by forcing the water through organic screens and venting the gases to the atmosphere. This process allows the dissolved gases to be separated from the water and released into the air, resulting in purified water. Cooling water, scrubbing the feedwater through gravel beds, and heating the water are not the methods used to remove dissolved gases in a deaerator.
119) Purpose of a safety valve on a steam boiler is to Regulate or control an even amount of steam pressure Regulate the blow back Prevent the pressure in a steam boiler from exceeding its maximum allowable working pressure. Protect the boiler The purpose of a safety valve on a steam boiler is to prevent the pressure in the boiler from exceeding its maximum allowable working pressure. This is important because if the pressure exceeds the maximum limit, it can lead to a catastrophic failure of the boiler, causing damage and potentially endangering lives. The safety valve acts as a safeguard by releasing excess pressure, ensuring that it stays within safe limits and preventing any potential accidents.
120) What is the primary purpose of a safety valve in a boiler? To regulate fuel flow To control water temperature To release excess steam pressure To monitor water level A safety valve in a boiler is a critical safety device designed to prevent excessive pressure buildup by releasing steam when the pressure exceeds a safe level. This helps prevent boiler explosions and ensures the safe operation of the boiler system.
121) Whn the boiler heating surface cannot be discerned, the boiler horsepower shall be determinated by dividing the Btu imput by__________. 42,500 67,000 75,000 150,000 The correct answer is 67,000. When the boiler heating surface cannot be discerned, the boiler horsepower is determined by dividing the Btu input by 67,000. This means that for every 67,000 Btu input, there is one boiler horsepower.
122) Boiler baffles are used_____. To direct the flue gases through the boiler furnance To increase the stack temperture In every boiler furnance To reduce heat transfer Boiler baffles are used to direct the flue gases through the boiler furnace.
123) Internal water treatment_____. Is used with low pressure boiler only Consists of chemicals added to the boiler feedwater Consits of a coagulant added to a settling tank Measures the ph of the feedwater Internal water treatment consists of chemicals added to the boiler feedwater in order to prevent scale formation, corrosion, and microbial growth. These chemicals help to maintain the quality of the water and protect the boiler and its components from damage. By adding the appropriate chemicals, the water treatment process helps to improve the efficiency and longevity of the boiler system.
124) The two general desings of electric boiler are the_____types. Firetube and Watertube AC and DC Electrode and Resistance Grounded and Ungraunded The correct answer is Electrode and Resistance. Electric boilers can be classified into two general designs based on their heating element: electrode and resistance. In electrode boilers, the water is heated by passing an electric current through electrodes immersed in the water. Resistance boilers, on the other hand, use electrical resistance to generate heat, typically through heating elements made of materials with high electrical resistance. These two designs offer different advantages and are suitable for different applications.
125) Convection is a method of heat transfer where the movement of fluids is due solely to the_______. Surface pressure Flow of fluids Difference in heationg time Gravitational differences Convection is a method of heat transfer where the movement of fluids is due solely to the flow of fluids. In convection, heat is transferred through the bulk movement of the fluid itself, as opposed to conduction where heat is transferred through direct contact between particles. This flow of fluids occurs because of the differences in temperature and density within the fluid, causing the warmer, less dense fluid to rise and the cooler, denser fluid to sink. This continuous circulation of fluid allows for the transfer of heat from one location to another.
126) The main function of a gas burner is to_____. Reagulate the gas flow into furnance Blow the gas into the furnance Mix the gas with combustion air Regulate amount of excess air The main function of a gas burner is to mix the gas with combustion air. This is an essential process in order to achieve proper combustion and efficient burning of the gas. By mixing the gas with the combustion air, the burner ensures that the fuel is evenly distributed and properly ignited, resulting in a controlled and efficient combustion process. This is crucial for achieving optimal heating or energy production in furnaces or other gas-powered systems.
127) What should be posted in the boiler room? Boiler logs Boilers licenses Inspection certificates or examination certificates Both B and C In a boiler room, it is necessary to post both Boiler licenses and Inspection certificates or examination certificates. Posting the boiler licenses ensures that the boiler operators are properly qualified and licensed to operate the boilers. On the other hand, posting the inspection certificates or examination certificates indicates that the boilers have been inspected and are in compliance with safety regulations. Therefore, both B and C should be posted in the boiler room to ensure proper documentation and compliance.
128) A high pressure steam boiler is a boiler with an MAWP of more than_____psi. 10 15 20 25 A high pressure steam boiler is a boiler that is designed to operate at a maximum allowable working pressure (MAWP) of more than 15 psi. This means that the boiler is capable of generating steam at a higher pressure, which can be used for various industrial applications that require high pressure steam. A MAWP of 15 psi or higher ensures that the boiler can handle the increased pressure without any safety concerns.
129) Handhole and manhole opening_____. Permit inspection, cleaning and repairs Require a cast iron reinforcing ring Are not require on low pressure hot water boiler Are used for draining the boiler “Handhole and manhole openings in a boiler permit inspection, cleaning, and repairs.
These openings allow access to the interior of the boiler, facilitating necessary maintenance activities such as inspections, cleaning to remove sediment or scale buildup, and repairs to any components or parts as needed to ensure the safe and efficient operation of the boiler.”
130) When a hydrostatic test of a boiler exceeds the maximum allowable working pressure each safety valve, if left attached to the boiler, should: Be held to its seat by screwing down the compressions spring Have its valve disc held to its seat by means of testing clamp or” gag Be set above the maximum allowable working pressure Continues sent fluid in draft “When a hydrostatic test of a boiler exceeds the maximum allowable working pressure, each safety valve should have its valve disc held to its seat by means of a testing clamp or “”gag””. This is necessary to prevent the safety valve from opening and releasing pressure during the test. By holding the valve disc to its seat, the safety valve remains closed and ensures that the pressure in the boiler does not exceed the maximum allowable working pressure.”
131) What chemical is used as an oxygen scavenger? Sodium sulfite Sodium hydroxide Sodium nitrite Sulfate nitrate Sodium sulfite is used as an oxygen scavenger because it has the ability to react with and remove oxygen from a system. It is commonly used in water treatment processes and in food preservation to prevent oxidation and spoilage. Sodium sulfite is a reducing agent, meaning it can donate electrons to oxygen molecules, effectively neutralizing its presence. This makes it an effective choice for scavenging oxygen and maintaining the quality and stability of various products and systems.