EPA 608 Core Actual Test 500 Questions and Correct

EPA 608 Core Actual Test 500 Questions and Correct Answers - Graded A+

What is the leading cause of refrigeration accidents leading to death?

• Phosgene gas inhalation
• Oxygen deprivation
• Freezing to death
• Electrocution - CORRECT ANSWER-b. Oxygen deprivation

What personal protective equipment should you wear when handling refrigerants?

• Safety glasses
• Butyl-lined protective gloves
• Safety shoes
• All the above - CORRECT ANSWER-d. All the above

What are the risks of inhaling (breathing in) refrigerants?

• Refrigerants can be deadly if inhaled or allowed to be heated
• Refrigerants inert and harmless if inhaled
• Refrigerants are only dangerous if heated
• Refrigerants can be safe if heated - CORRECT ANSWER-a. Refrigerants can be deadly if inhaled or

allowed to be heated

What are the requirements under ASHRAE standard 15-1994?

• Requires a refrigerant sensor that will sound an alarm and

automatically start a ventilation system in occupied equipment rooms where refrigerant (regardless of refrigerant type) from a leak will concentrate.

• Requires a refrigerant sensor that will sound an alarm and automatically

start a ventilation system in occupied equipment rooms where R-123 from a leak will concentrate

• Requires a refrigerant sensor that will sound an alarm and automatically 1 / 4

start a ventilation system in occupied equipment rooms where R-11 from a leak will concentrate

• Requires a refrigerant sensor that will sound an alarm and automatically

start a ventilation system in occupied equipment rooms where R-12 from a leak will concentrate - CORRECT ANSWER-a. Requires a refrigerant sensor that will sound an alarm and automatically start a ventilation system in occupied equipment rooms where refrigerant (regardless of refrigerant type) from a leak will concentrate.

Under what conditions will alarm and ventilation sound under ASHRAE standard

15-1994?

• The alarm will sound before the TLV-TWA (Threshold Limit Value -

Time weighted Average) is exceeded (oxygen deprivation level).

• The alarm will sound after the TLV-TWA (Threshold Limit Value - Time

weighted Average) is exceeded (oxygen deprivation level).

• The alarm will sound before when any leak is detected
• The alarm will sound before when any leak in excess of 100 PPM is

detected - CORRECT ANSWER-a. The alarm will sound before the TLV-TWA (Threshold Limit Value - Time weighted Average) is exceeded (oxygen deprivation level).

What is the safest rating of a refrigerant according to the ASHRAE scale?

• A-1 is considered the safest refrigerant while B-3 is the least safe
• B-1 is considered the safest refrigerant while A-3 is the least safe
• B-3 is considered the safest refrigerant while A-1 is the least safe
• None of the above. - CORRECT ANSWER-a. A-1 is considered the safest refrigerant while B-3 is the

least safe

Why should oxygen or compressed air never be used to test leak a system?

• Oxygen or compressed air, when mixed with refrigerants, can cause

an explosion

• Oxygen or compressed air contain moisture and will contaminate the 2 / 4

system

• Oxygen or compressed air can't be detected by leak checking tools
• None of the above - CORRECT ANSWER-a. Oxygen or compressed air, when mixed with

refrigerants, can cause an explosion

When using nitrogen to charge a system, what piece of equipment should it be charged through and where should a relief valve be located?

• Charge through a refrigeration manifold with a relief valve on the nitrogen

cylinder

• Charge through a pressure regulator (make sure the nitrogen

cylinder has a regulator on it) and insert a relief valve downstream line from the pressure regulator

• Install a relief valve prior to the pressure regulator.
• None of the above - CORRECT ANSWER-b. Charge through a pressure regulator (make sure the

nitrogen cylinder has a regulator on it) and insert a relief valve downstream line from the pressure regulator

Where can you find the appropriate test pressures for a system?

• ARI directory
• Data plate on the low-side pressure valve
• Manufactures certified test data
• None of the above - CORRECT ANSWER-b. Data plate on the low-side pressure valve

What are the two conditions to be aware of in observing relief valves?

• NOT to be installed in series.
• Be replaced if corrosion build-up is found within the body of a relief valve.
• a and b
• None of the above - CORRECT ANSWER-c. a and b

What can happen to refrigerants if they are exposed to direct flame or other 3 / 4

excessive heat?

• Change into toxic materials like phosgene gas
• Explode
• a and b
• All of the above - CORRECT ANSWER-a. Change into toxic materials like phosgene gas

Before welding, cutting or brazing a refrigerant line, what should be done?

• Read MSDS sheet
• Evacuate all refrigerant
• Run a constant flow of refrigerant through it while welding
• None of the above - CORRECT ANSWER-b. Evacuate all refrigerant

In case of a major refrigerant leak, what actions should be taken?

• Stop the leak
• Close any valves
• Turn off any open flames
• Immediately vacate and ventilate the area or use Self Contained Breathing Apparatus (SCBA). -

CORRECT ANSWER-d. Immediately vacate and ventilate the area or use Self Contained Breathing Apparatus (SCBA).

What types of cylinders can be used for recovery and how can you visually identify them?

• Nitrogen marked nitrogen
• Cylinders of the appropriate color for the refrigerant being used
• Cylinders marked "RECOVERY"
• Yellow tops and gray bodies - CORRECT ANSWER-d. Yellow tops and gray bodies

How often should refillable cylinders be hydrostatically tested?

• Every 5 years
• Every 3 years
• Every 2 years
• Every year - CORRECT ANSWER-a. Every 5 years
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