Propane Practice Tests Exam With 100% Correct Answers 2024

PROPANE PRACTICE TESTS EXAM
WITH 100% CORRECT ANSWERS 2024
SECTION 1: GENERAL SAFETY & PROPERTY (Questions 1–10)
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1. Which odorant is added to propane to give it a distinct smell?
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A) Methanethiol (mercaptan)
cx cx



B) Chlorine
cx



C) Ammonia
cx



D) Sulfur dioxide
cx cx




Correct Answer: A cx cx




2. The Lower Flammable Limit (LFL) of propane in air is approximately:
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A) 1.5%
cx



B) 2.1%
cx



C) 5.3%
cx



D) 9.5%
cx




Correct Answer: B cx cx




3. In the event of a propane leak inside a building, the first action should be:
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A) Open all windows and doors
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B) Evacuate everyone and call 911/fire department from a safe distance
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C) Turn off the main gas supply at the tank
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D) Use a match to find the leak
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Correct Answer: B cx cx




4. Propane vapor is heavier than air. Where will it accumulate?
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A) Near the ceiling
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B) At the highest point of the room
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C) At floor level or in low areas
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D) Evenly throughout the space
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Correct Answer: C cx cx




5. Which NFPA standard is the primary reference for the storage and handling of liquefied petroleum
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gases?

,A) NFPA 54
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B) NFPA 58
cx cx



C) NFPA 70 (NEC)
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D) NFPA 72
cx cx




Correct Answer: B cx cx




6. When working on a propane system, personal protective equipment (PPE) should include at minim
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um:
A) Safety glasses and steel-toe boots
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B) Flame-resistant clothing and gloves
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C) Hearing protection
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D) All of the above
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Correct Answer: D cx cx




7. A Class B fire (flammable liquids/gases) on a propane system should be extinguished with:
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A) Water spray
cx cx



B) Dry chemical (e.g., Purple K) or CO₂
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C) Foam only
cx cx



D) Sand only
cx cx




Correct Answer: B cx cx




8. The maximum allowable filling capacity of a propane cylinder (by liquid volume) is:
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A) 80%
cx



B) 85%
cx



C) 90%
cx



D) 95%
cx




Correct Answer: A (80% is the legal limit to allow expansion)
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9. What color is a properly painted residential propane tank (above-ground)?
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A) Red
cx



B) Yellow
cx



C) White or light-reflective colors (silver/beige)
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D) Black
cx




Correct Answer: C cx cx

,10. If you smell propane while entering a building, you should:
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A) Turn on a light switch to see
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B) Use your cell phone inside the building
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C) Leave immediately and do not operate any electrical devices
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D) Open the furnace to ventilate
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Correct Answer: C cx cx




SECTION 2: REGULATORS & PRESSURE CONTROL (Questions 11–18)
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11. A typical residential propane first-
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stage regulator reduces tank pressure from approximately 200 psi to:
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A) 0.5 psi
cx cx



B) 5–10 psi
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C) 50–60 psi
cx cx



D) 100 psi
cx cx




Correct Answer: B (Typical first-stage outlet: 10 psi)
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12. The purpose of a second-stage regulator is to:
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A) Increase gas pressure for appliances
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B) Reduce pressure to 11 inches of water column (WC)
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C) Measure gas flow
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D) Shut off gas in an emergency
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Correct Answer: B cx cx




13. A "vent limiter" on a regulator is designed to:
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A) Increase flow during high demand
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B) Automatically close if the vent is blocked
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C) Limit the amount of gas released if the diaphragm fails
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D) Reduce noise
cx cx




Correct Answer: C cx cx




14. What is the standard manifold pressure for most natural gas appliances converted to propane?
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A) 3.5" WC
cx cx



B) 7" WC
cx cx



C) 11" WC
cx cx



D) 14" WC
cx cx




Correct Answer: C (11" WC is standard for propane)
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, 15. Regulator freeze-up is usually caused by:
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A) Water in the gas stream
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B) Over-pressurization
cx



C) Excessive ambient heat
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D) Improper mounting angle
cx cx cx




Correct Answer: A cx cx




16. An integral two-stage regulator is typically used on:
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A) Large industrial tanks
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B) Cylinders (e.g., BBQ tanks)
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C) Underground storage
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D) Main distribution lines
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Correct Answer: B cx cx




17. The maximum allowable pressure drop across a regulator during full load is generally:
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A) 1" WC
cx cx



B) 2" WC
cx cx



C) 5" WC
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D) No drop is allowed
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Correct Answer: A (NFPA 58 allows 1" WC max drop)
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18. Which test is used to check regulator lock-up pressure?
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A) Leak test
cx cx



B) Pressure decay test
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C) Static pressure test with no flow
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D) Flow capacity test
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Correct Answer: C cx cx




SECTION 3: PIPE SIZING & INSTALLATION (Questions 19–28)
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19. In a propane piping system, the total equivalent length (TEL) includes:
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A) Only straight pipe
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B) Straight pipe plus fittings and valves
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C) Only the longest run
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D) Vertical runs only
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Correct Answer: B cx cx