South Carolina LP Gas Dealer/Installer Practice Exam
1. LP gas is primarily composed of:
A. Butane and propane
B. Methane only
C. Ethane and methane
D. Hydrogen and oxygen
Answer: A. Butane and propane
2. Which of the following is the boiling point of propane at atmospheric
pressure?
A. –44°F
B. 0°F
C. 32°F
D. –10°F
Answer: A. –44°F
3. The main purpose of a two-stage regulator system is to:
A. Increase gas pressure to the appliance
B. Reduce high cylinder/tank pressure to appliance pressure in two steps
C. Store excess propane
D. Prevent vaporization of propane
Answer: B. Reduce high cylinder/tank pressure to appliance pressure in
two steps
4. The odorant added to propane for leak detection is:
A. Sulfur dioxide
B. Ethyl mercaptan
C. Carbon monoxide
D. Methyl chloride
Answer: B. Ethyl mercaptan
5. NFPA 58 is the primary code governing:
A. Electrical wiring
B. LP gas storage and handling
C. Natural gas transmission pipelines
,D. Fire hydrant installations
Answer: B. LP gas storage and handling
6. Which type of piping is NOT approved for propane service?
A. Copper tubing (Type K or L)
B. Polyethylene plastic (PE) underground pipe (approved type)
C. Black iron pipe
D. PVC plastic pipe
Answer: D. PVC plastic pipe
7. The maximum filling percentage of a propane cylinder (by volume of
liquid) is typically:
A. 100%
B. 90%
C. 70%
D. 60%
Answer: B. 90%
8. DOT cylinders must be requalified after how many years?
A. 5 years
B. 12 years from manufacture, then every 5 years
C. Every 2 years
D. 15 years from manufacture
Answer: B. 12 years from manufacture, then every 5 years
9. The relief valve on an ASME propane tank is designed to:
A. Add more propane into the tank
B. Relieve excess internal pressure
C. Prevent odor fade
D. Reduce propane vaporization
Answer: B. Relieve excess internal pressure
10. A “pigtail” in propane installation refers to:
A. A relief valve extension
B. A flexible connector between the cylinder and regulator
C. A grounding conductor
D. A vent pipe extension
Answer: B. A flexible connector between the cylinder and regulator
11. When installing propane piping inside a building, joints must be:
A. Buried in concrete
B. Accessible or properly sealed
,C. Soldered only
D. Left untested
Answer: B. Accessible or properly sealed
12. Propane vapor is:
A. Heavier than air
B. Lighter than air
C. Same weight as air
D. Weightless
Answer: A. Heavier than air
13. A propane tank must be located at least how far from a building
opening (window/door)?
A. 1 foot
B. 3 feet
C. 5 feet
D. 10 feet
Answer: C. 5 feet
14. An underground propane tank must be coated and equipped with:
A. Galvanized paint
B. Rustproof aluminum
C. Cathodic protection (sacrificial anode or impressed current)
D. Stainless steel finish
Answer: C. Cathodic protection (sacrificial anode or impressed current)
15. A leak test after new installation or modification is performed with:
A. Soapy water or leak detection solution
B. Open flame
C. Matchstick method
D. Pressure release valve
Answer: A. Soapy water or leak detection solution
16. Propane vapor pressure inside a container is affected by:
A. Volume only
B. Temperature only
C. Both temperature and volume
D. Altitude only
Answer: B. Temperature only
17. What is the color coding for propane cylinders?
A. Red top, yellow body
, B. Blue top, black body
C. No federally mandated color, varies by company
D. Solid green
Answer: C. No federally mandated color, varies by company
18. A regulator vent must be installed:
A. Facing upward only
B. Protected from weather and dirt, oriented downward/outward
C. Inside sealed cabinet
D. Directly under eaves
Answer: B. Protected from weather and dirt, oriented downward/outward
19. Which type of thread is used on propane fittings?
A. NPT (National Pipe Thread)
B. ACME only
C. Machine screw threads
D. Metric threads
Answer: A. NPT (National Pipe Thread)
20. A properly adjusted appliance flame should be:
A. Yellow and lazy
B. Blue with a small yellow tip
C. Completely red
D. Orange and flickering
Answer: B. Blue with a small yellow tip
21. The liquid withdrawal valve on a propane tank is used primarily for:
A. Supplying appliances directly
B. Filling smaller cylinders
C. Pressure relief only
D. Removing impurities
Answer: B. Filling smaller cylinders
22. NFPA 54 is known as the:
A. National Electrical Code
B. National Fuel Gas Code
C. National Fire Code
D. Propane Cylinder Transport Code
Answer: B. National Fuel Gas Code
23. The first step before servicing a propane appliance is:
A. Disconnect regulator vent
1. LP gas is primarily composed of:
A. Butane and propane
B. Methane only
C. Ethane and methane
D. Hydrogen and oxygen
Answer: A. Butane and propane
2. Which of the following is the boiling point of propane at atmospheric
pressure?
A. –44°F
B. 0°F
C. 32°F
D. –10°F
Answer: A. –44°F
3. The main purpose of a two-stage regulator system is to:
A. Increase gas pressure to the appliance
B. Reduce high cylinder/tank pressure to appliance pressure in two steps
C. Store excess propane
D. Prevent vaporization of propane
Answer: B. Reduce high cylinder/tank pressure to appliance pressure in
two steps
4. The odorant added to propane for leak detection is:
A. Sulfur dioxide
B. Ethyl mercaptan
C. Carbon monoxide
D. Methyl chloride
Answer: B. Ethyl mercaptan
5. NFPA 58 is the primary code governing:
A. Electrical wiring
B. LP gas storage and handling
C. Natural gas transmission pipelines
,D. Fire hydrant installations
Answer: B. LP gas storage and handling
6. Which type of piping is NOT approved for propane service?
A. Copper tubing (Type K or L)
B. Polyethylene plastic (PE) underground pipe (approved type)
C. Black iron pipe
D. PVC plastic pipe
Answer: D. PVC plastic pipe
7. The maximum filling percentage of a propane cylinder (by volume of
liquid) is typically:
A. 100%
B. 90%
C. 70%
D. 60%
Answer: B. 90%
8. DOT cylinders must be requalified after how many years?
A. 5 years
B. 12 years from manufacture, then every 5 years
C. Every 2 years
D. 15 years from manufacture
Answer: B. 12 years from manufacture, then every 5 years
9. The relief valve on an ASME propane tank is designed to:
A. Add more propane into the tank
B. Relieve excess internal pressure
C. Prevent odor fade
D. Reduce propane vaporization
Answer: B. Relieve excess internal pressure
10. A “pigtail” in propane installation refers to:
A. A relief valve extension
B. A flexible connector between the cylinder and regulator
C. A grounding conductor
D. A vent pipe extension
Answer: B. A flexible connector between the cylinder and regulator
11. When installing propane piping inside a building, joints must be:
A. Buried in concrete
B. Accessible or properly sealed
,C. Soldered only
D. Left untested
Answer: B. Accessible or properly sealed
12. Propane vapor is:
A. Heavier than air
B. Lighter than air
C. Same weight as air
D. Weightless
Answer: A. Heavier than air
13. A propane tank must be located at least how far from a building
opening (window/door)?
A. 1 foot
B. 3 feet
C. 5 feet
D. 10 feet
Answer: C. 5 feet
14. An underground propane tank must be coated and equipped with:
A. Galvanized paint
B. Rustproof aluminum
C. Cathodic protection (sacrificial anode or impressed current)
D. Stainless steel finish
Answer: C. Cathodic protection (sacrificial anode or impressed current)
15. A leak test after new installation or modification is performed with:
A. Soapy water or leak detection solution
B. Open flame
C. Matchstick method
D. Pressure release valve
Answer: A. Soapy water or leak detection solution
16. Propane vapor pressure inside a container is affected by:
A. Volume only
B. Temperature only
C. Both temperature and volume
D. Altitude only
Answer: B. Temperature only
17. What is the color coding for propane cylinders?
A. Red top, yellow body
, B. Blue top, black body
C. No federally mandated color, varies by company
D. Solid green
Answer: C. No federally mandated color, varies by company
18. A regulator vent must be installed:
A. Facing upward only
B. Protected from weather and dirt, oriented downward/outward
C. Inside sealed cabinet
D. Directly under eaves
Answer: B. Protected from weather and dirt, oriented downward/outward
19. Which type of thread is used on propane fittings?
A. NPT (National Pipe Thread)
B. ACME only
C. Machine screw threads
D. Metric threads
Answer: A. NPT (National Pipe Thread)
20. A properly adjusted appliance flame should be:
A. Yellow and lazy
B. Blue with a small yellow tip
C. Completely red
D. Orange and flickering
Answer: B. Blue with a small yellow tip
21. The liquid withdrawal valve on a propane tank is used primarily for:
A. Supplying appliances directly
B. Filling smaller cylinders
C. Pressure relief only
D. Removing impurities
Answer: B. Filling smaller cylinders
22. NFPA 54 is known as the:
A. National Electrical Code
B. National Fuel Gas Code
C. National Fire Code
D. Propane Cylinder Transport Code
Answer: B. National Fuel Gas Code
23. The first step before servicing a propane appliance is:
A. Disconnect regulator vent
