NCCER PIPEFITTER TEST LATEST EXAM WITH CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL-DEFINED ANSWERS LATEST ALREADY GRADED A+ 2026
Question 1
What is the decimal equivalent of the fraction 1/4?
A) 0.15
B) 0.20
C) 0.25
D) 0.40
E) 0.50
Correct Answer: C) 0.25
Rationale: To convert a fraction to a decimal, divide the numerator by the denominator (1 ÷
4 = 0.25).
Question 2
When piping is field-routed to a pump, how must it be supported?
A) Attached to the pump casing
B) Supported by the motor mount
C) Independently supported
D) Tied to the suction flange
E) It does not require support if under 2 inches
Correct Answer: C) Independently supported
Rationale: Piping must be supported independently of the pump to prevent the weight and
stress of the pipe from causing misalignment or damage to the pump casing and bearings.
Question 3
Which of the following should be used to light a cutting torch safely?
A) A cigarette lighter
B) A match
C) A striker
D) A hot piece of metal
E) An open flame from another torch
Correct Answer: C) Striker
Rationale: A friction-based striker is the only approved tool for lighting a torch; using
lighters or matches brings the hand too close to the flame and poses an explosion risk.
Question 4
Where is the specific information required to install piping and associated items found?
A) The employee handbook
B) Standards and specifications
C) The tool room log
D) The shipping manifest
E) Oral instructions only
Correct Answer: B) Standards and specifications
, 2
Rationale: Standards and specifications provide the necessary technical details regarding
materials, tolerances, and installation procedures for a specific project.
Question 5
What is the proper procedure for handling damaged or broken tools on a job site?
A) Fix them with duct tape
B) Use them carefully until the shift ends
C) Place them back in the toolbox
D) Take them out of service
E) Give them to a helper
Correct Answer: D) Take them out of service
Rationale: Damaged tools are a safety hazard and must be removed from the work area and
tagged to prevent others from using them until they are repaired or replaced.
Question 6
What is the Inside Diameter (ID) of a 10-inch schedule 80 pipe?
A) 10 3/4"
B) 10"
C) 9 9/16"
D) 9 1/4"
E) 10 1/8"
Correct Answer: C) 9 9/16"
Rationale: For schedule 80 pipe, the wall thickness is greater than schedule 40, which
reduces the internal diameter. For a 10" nominal pipe, the ID is 9.5625 inches (9 9/16").
Question 7
The two steps involved in making up threaded joints are hand engagement and:
A) Hammer tightening
B) Wrench makeup
C) Heat shrinking
D) Solvent welding
E) Snap fitting
Correct Answer: B) Wrench makeup
Rationale: Threaded joints are first turned by hand to ensure the threads are not crossed,
followed by wrench makeup to achieve a leak-proof seal.
Question 8
Which action must be taken before a hydrostatic test is performed on a piping system?
A) Add more lubricant to the pump
B) Remove pressure relief valves
C) Close all vents
, 3
D) Increase the temperature of the fluid
E) Paint the joints
Correct Answer: B) Remove pressure relief valves
Rationale: Pressure relief valves must be removed or blinded off during a hydro test because
the test pressure usually exceeds the set point of the relief valve.
Question 9
How many ordinate lines are needed to lay out a cut for a 4-inch lateral riser on a 6-inch pipe?
A) 4
B) 6
C) 8
D) 12
E) 16
Correct Answer: C) 8
Rationale: Standard pipefitting layout for small to medium diameters typically utilizes 8
ordinate lines to ensure an accurate cut-line around the circumference.
Question 10
Who is the only person qualified to repair power tools?
A) The foreman
B) A journeyman pipefitter
C) A competent technician
D) The safety officer
E) Any employee with a screwdriver
Correct Answer: C) Competent technician
Rationale: Power tool repairs require specialized knowledge of electrical and mechanical
systems to ensure the tool remains safe for use.
Question 11
Which of the following plastic pipes is NOT joined by solvent welding?
A) PVC
B) CPVC
C) ABS
D) HDPE
E) PVC Schedule 80
Correct Answer: D) HDPE
Rationale: High-Density Polyethylene (HDPE) is typically joined by heat fusion or
mechanical fittings, as it is resistant to the chemicals found in standard solvent cements.
Question 12
The material placed in the bottom of a trench under the pipe to provide consistent support is
, 4
called:
A) Backfill
B) Bedding
C) Shoring
D) Silt
E) Gravel cap
Correct Answer: B) Bedding
Rationale: Bedding is the specific layer of material (often sand or fine gravel) used to level
the trench and support the pipe's weight evenly.
Question 13
What is the purpose of the 1/16" to 1/8" gap between the end of the pipe and the bottom of the
socket in a socket weld joint?
A) To allow for easier cleaning
B) To prevent weld cracking
C) To increase fluid flow
D) To make the pipe easier to turn
E) To allow for internal inspection
Correct Answer: B) Prevents weld cracking
Rationale: The gap allows for thermal expansion of the pipe during the welding process;
without it, the pipe would expand against the bottom of the socket and cause the cooling
weld to crack.
Question 14
When are rupture discs typically installed into a pipeline?
A) During the fabrication stage
B) After the first year of service
C) Before start-up of the system
D) Only during emergency repairs
E) After the system has reached maximum pressure
Correct Answer: C) Before start-up of the system
Rationale: Rupture discs are safety devices that must be in place before the system is
pressurized to protect against over-pressurization.
Question 15
Chain come-alongs are primarily designed for which type of movement?
A) Horizontal pulling only
B) Vertical lifting
C) Measuring pipe length
D) Bending small diameter tubing
E) Supporting scaffolding
CORRECTLY WELL-DEFINED ANSWERS LATEST ALREADY GRADED A+ 2026
Question 1
What is the decimal equivalent of the fraction 1/4?
A) 0.15
B) 0.20
C) 0.25
D) 0.40
E) 0.50
Correct Answer: C) 0.25
Rationale: To convert a fraction to a decimal, divide the numerator by the denominator (1 ÷
4 = 0.25).
Question 2
When piping is field-routed to a pump, how must it be supported?
A) Attached to the pump casing
B) Supported by the motor mount
C) Independently supported
D) Tied to the suction flange
E) It does not require support if under 2 inches
Correct Answer: C) Independently supported
Rationale: Piping must be supported independently of the pump to prevent the weight and
stress of the pipe from causing misalignment or damage to the pump casing and bearings.
Question 3
Which of the following should be used to light a cutting torch safely?
A) A cigarette lighter
B) A match
C) A striker
D) A hot piece of metal
E) An open flame from another torch
Correct Answer: C) Striker
Rationale: A friction-based striker is the only approved tool for lighting a torch; using
lighters or matches brings the hand too close to the flame and poses an explosion risk.
Question 4
Where is the specific information required to install piping and associated items found?
A) The employee handbook
B) Standards and specifications
C) The tool room log
D) The shipping manifest
E) Oral instructions only
Correct Answer: B) Standards and specifications
, 2
Rationale: Standards and specifications provide the necessary technical details regarding
materials, tolerances, and installation procedures for a specific project.
Question 5
What is the proper procedure for handling damaged or broken tools on a job site?
A) Fix them with duct tape
B) Use them carefully until the shift ends
C) Place them back in the toolbox
D) Take them out of service
E) Give them to a helper
Correct Answer: D) Take them out of service
Rationale: Damaged tools are a safety hazard and must be removed from the work area and
tagged to prevent others from using them until they are repaired or replaced.
Question 6
What is the Inside Diameter (ID) of a 10-inch schedule 80 pipe?
A) 10 3/4"
B) 10"
C) 9 9/16"
D) 9 1/4"
E) 10 1/8"
Correct Answer: C) 9 9/16"
Rationale: For schedule 80 pipe, the wall thickness is greater than schedule 40, which
reduces the internal diameter. For a 10" nominal pipe, the ID is 9.5625 inches (9 9/16").
Question 7
The two steps involved in making up threaded joints are hand engagement and:
A) Hammer tightening
B) Wrench makeup
C) Heat shrinking
D) Solvent welding
E) Snap fitting
Correct Answer: B) Wrench makeup
Rationale: Threaded joints are first turned by hand to ensure the threads are not crossed,
followed by wrench makeup to achieve a leak-proof seal.
Question 8
Which action must be taken before a hydrostatic test is performed on a piping system?
A) Add more lubricant to the pump
B) Remove pressure relief valves
C) Close all vents
, 3
D) Increase the temperature of the fluid
E) Paint the joints
Correct Answer: B) Remove pressure relief valves
Rationale: Pressure relief valves must be removed or blinded off during a hydro test because
the test pressure usually exceeds the set point of the relief valve.
Question 9
How many ordinate lines are needed to lay out a cut for a 4-inch lateral riser on a 6-inch pipe?
A) 4
B) 6
C) 8
D) 12
E) 16
Correct Answer: C) 8
Rationale: Standard pipefitting layout for small to medium diameters typically utilizes 8
ordinate lines to ensure an accurate cut-line around the circumference.
Question 10
Who is the only person qualified to repair power tools?
A) The foreman
B) A journeyman pipefitter
C) A competent technician
D) The safety officer
E) Any employee with a screwdriver
Correct Answer: C) Competent technician
Rationale: Power tool repairs require specialized knowledge of electrical and mechanical
systems to ensure the tool remains safe for use.
Question 11
Which of the following plastic pipes is NOT joined by solvent welding?
A) PVC
B) CPVC
C) ABS
D) HDPE
E) PVC Schedule 80
Correct Answer: D) HDPE
Rationale: High-Density Polyethylene (HDPE) is typically joined by heat fusion or
mechanical fittings, as it is resistant to the chemicals found in standard solvent cements.
Question 12
The material placed in the bottom of a trench under the pipe to provide consistent support is
, 4
called:
A) Backfill
B) Bedding
C) Shoring
D) Silt
E) Gravel cap
Correct Answer: B) Bedding
Rationale: Bedding is the specific layer of material (often sand or fine gravel) used to level
the trench and support the pipe's weight evenly.
Question 13
What is the purpose of the 1/16" to 1/8" gap between the end of the pipe and the bottom of the
socket in a socket weld joint?
A) To allow for easier cleaning
B) To prevent weld cracking
C) To increase fluid flow
D) To make the pipe easier to turn
E) To allow for internal inspection
Correct Answer: B) Prevents weld cracking
Rationale: The gap allows for thermal expansion of the pipe during the welding process;
without it, the pipe would expand against the bottom of the socket and cause the cooling
weld to crack.
Question 14
When are rupture discs typically installed into a pipeline?
A) During the fabrication stage
B) After the first year of service
C) Before start-up of the system
D) Only during emergency repairs
E) After the system has reached maximum pressure
Correct Answer: C) Before start-up of the system
Rationale: Rupture discs are safety devices that must be in place before the system is
pressurized to protect against over-pressurization.
Question 15
Chain come-alongs are primarily designed for which type of movement?
A) Horizontal pulling only
B) Vertical lifting
C) Measuring pipe length
D) Bending small diameter tubing
E) Supporting scaffolding
