Apprentice Pipefitter Licensing Examination
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a pipefitter in industrial settings?
A. Electrical wiring installation
B. Installation and maintenance of piping systems
C. Structural steel fabrication
D. HVAC refrigeration charging
Correct Answer: B
Pipefitters specialize in the layout, assembly, installation, and
maintenance of piping systems that transport liquids, gases, and
sometimes solids. This includes working in industrial plants,
power stations, and manufacturing facilities. The other options
describe different trades such as electricians,
welders/ironworkers, and HVAC technicians.
,2. Which tool is most commonly used to measure pipe diameter?
A. Micrometer
B. Pipe wrench
C. Caliper
D. Hacksaw
Correct Answer: C
Calipers are designed to accurately measure internal and
external dimensions, including pipe diameters. Pipe wrenches
are for turning pipes, micrometers measure very small precision
components, and hacksaws are cutting tools.
3. What does NPS stand for in piping terminology?
A. Nominal Pipe Size
B. New Pipe Standard
C. National Pressure System
D. Normal Pipe Strength
Correct Answer: A
NPS refers to Nominal Pipe Size, a North American standard used
to define pipe dimensions. It does not directly correspond to
actual measured diameter but is a standardized reference.
,4. Which material is most commonly used for high-pressure steam
lines?
A. PVC
B. Copper
C. Carbon steel
D. Aluminum
Correct Answer: C
Carbon steel is widely used in high-pressure steam systems due
to its strength, heat resistance, and durability. PVC and copper
cannot withstand high steam pressures, and aluminum is not
suitable for such high-temperature applications.
5. What is the function of a pipe thread sealant?
A. To lubricate cutting tools
B. To prevent leaks in threaded joints
C. To increase pipe diameter
D. To strengthen pipe walls
Correct Answer: B
Thread sealants such as Teflon tape or pipe dope are used to fill
gaps in threaded connections to prevent leaks. They do not affect
pipe strength or diameter.
, 6. Which type of valve is best for fully stopping or allowing flow?
A. Globe valve
B. Gate valve
C. Check valve
D. Relief valve
Correct Answer: B
Gate valves are designed for on/off control of flow, providing
minimal restriction when fully open. Globe valves regulate flow,
check valves prevent backflow, and relief valves control pressure.
7. What is the standard unit for measuring pipe pressure?
A. Liters
B. Pascals or PSI
C. Meters per second
D. Gallons
Correct Answer: B
Pressure in piping systems is measured in Pascals (SI unit) or PSI
(pounds per square inch) in imperial systems.
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a pipefitter in industrial settings?
A. Electrical wiring installation
B. Installation and maintenance of piping systems
C. Structural steel fabrication
D. HVAC refrigeration charging
Correct Answer: B
Pipefitters specialize in the layout, assembly, installation, and
maintenance of piping systems that transport liquids, gases, and
sometimes solids. This includes working in industrial plants,
power stations, and manufacturing facilities. The other options
describe different trades such as electricians,
welders/ironworkers, and HVAC technicians.
,2. Which tool is most commonly used to measure pipe diameter?
A. Micrometer
B. Pipe wrench
C. Caliper
D. Hacksaw
Correct Answer: C
Calipers are designed to accurately measure internal and
external dimensions, including pipe diameters. Pipe wrenches
are for turning pipes, micrometers measure very small precision
components, and hacksaws are cutting tools.
3. What does NPS stand for in piping terminology?
A. Nominal Pipe Size
B. New Pipe Standard
C. National Pressure System
D. Normal Pipe Strength
Correct Answer: A
NPS refers to Nominal Pipe Size, a North American standard used
to define pipe dimensions. It does not directly correspond to
actual measured diameter but is a standardized reference.
,4. Which material is most commonly used for high-pressure steam
lines?
A. PVC
B. Copper
C. Carbon steel
D. Aluminum
Correct Answer: C
Carbon steel is widely used in high-pressure steam systems due
to its strength, heat resistance, and durability. PVC and copper
cannot withstand high steam pressures, and aluminum is not
suitable for such high-temperature applications.
5. What is the function of a pipe thread sealant?
A. To lubricate cutting tools
B. To prevent leaks in threaded joints
C. To increase pipe diameter
D. To strengthen pipe walls
Correct Answer: B
Thread sealants such as Teflon tape or pipe dope are used to fill
gaps in threaded connections to prevent leaks. They do not affect
pipe strength or diameter.
, 6. Which type of valve is best for fully stopping or allowing flow?
A. Globe valve
B. Gate valve
C. Check valve
D. Relief valve
Correct Answer: B
Gate valves are designed for on/off control of flow, providing
minimal restriction when fully open. Globe valves regulate flow,
check valves prevent backflow, and relief valves control pressure.
7. What is the standard unit for measuring pipe pressure?
A. Liters
B. Pascals or PSI
C. Meters per second
D. Gallons
Correct Answer: B
Pressure in piping systems is measured in Pascals (SI unit) or PSI
(pounds per square inch) in imperial systems.
