Practice Exam Questions And Correct

High-Pressure Boiler Operator License Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a high-pressure boiler?
• To store steam
• To condense steam
• To generate low-pressure hot water
• To produce steam or heat at high pressure

Rationale: High-pressure boilers are designed to generate steam or heat

above 15 psi for power or process use.

• Which device prevents boiler pressure from exceeding safe limits?
• Fusible plug
• Safety valve
• Pressure gauge 1 / 3

• Steam trap

Rationale: Safety valves open automatically when pressure exceeds the set

point.

3. Steam pressure in a boiler is measured using a:

• Manometer
• Thermostat
• Bourdon tube pressure gauge
• Draft gauge

Rationale: Bourdon tube gauges are standard for boiler steam pressure

measurement.

4. The water level in a boiler should be checked using the:

• Sight glass
• Pressure switch
• Sight glass
• Steam trap

Rationale: Sight glasses allow the operator to visually confirm water level.

5. Low-water conditions in a boiler may result in:

• Improved efficiency
• Larger steam volume
• Overheating and possible boiler failure
• Lower pressure drop 2 / 3

Rationale: Without proper water coverage, boiler metal overheats and can

rupture.

6. The purpose of bottom blowdown is to:

• Reduce steam pressure
• Remove sludge and sediment
• Increase water level
• Test the safety valve

Rationale: Blowdown clears mud drum sediment to maintain efficiency and

safety.

• Which burner type uses mechanical means to atomize fuel oil?
• Atmospheric
• Pressure atomizing burner
• Rotary cup
• Surface combustion

Rationale: Pressure atomizing burners use pump pressure to break the oil

into droplets.

8. Draft in a boiler refers to:

• Steam movement
• Movement of air and flue gases through the boiler
• Cooling air intake
• Damper temperature

Rationale: Draft ensures proper combustion air and exhaust flow.

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