Mechanical Journeyman License Exam

Mechanical Journeyman License Exam Practice Test (Entry-Level) Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a mechanical code?

a) To provide design aesthetics

b) To establish safety and performance standards

c) To ensure public health and safety through mechanical system

regulation

d) To reduce project costs

Rationale: The mechanical code ensures systems are installed safely,

protecting public health and safety by regulating installation and maintenance practices.

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• What type of piping is typically used for natural gas distribution inside

buildings?

a) PVC

b) Copper Type M

c) Black steel pipe

d) Galvanized steel

Rationale: Black steel is used for gas because it resists corrosion and is

approved for natural gas distribution.

• Which fitting is used to connect two pipes of different diameters?

a) Coupling

b) Elbow

c) Reducer

d) Union

Rationale: A reducer fitting transitions between different pipe sizes,

ensuring flow continuity.

4. The term “CFM” stands for:

a) Cubic Feet of Metal

b) Cubic Feet per Minute

c) Central Flow Measurement

d) Cubic Fluid Motion 2 / 4

Rationale: CFM measures air volume flow rate in HVAC systems, crucial for

ventilation design.

• Which tool is used to cut copper tubing cleanly?

a) Hacksaw

b) Tubing cutter

c) Reciprocating saw

d) Pipe reamer

Rationale: A tubing cutter provides a smooth, square cut essential for leak-

free joints.

• What is the typical color of natural gas piping?

a) Blue

b) Red

c) Yellow

d) Green

Rationale: Yellow is the standardized color for gas lines to indicate

combustible contents.

• What type of valve allows flow in only one direction?

a) Gate valve

b) Globe valve 3 / 4

c) Check valve

d) Ball valve

Rationale: A check valve prevents backflow, maintaining unidirectional

fluid movement.

• In HVAC systems, what does “BTU” measure?

a) Electrical power

b) Pressure

c) Heat energy

d) Air volume

Rationale: BTU stands for British Thermal Unit, representing heat energy

required to raise water temperature.

• Which gas is most commonly used for leak testing refrigeration systems?

a) Nitrogen

b) Oxygen

c) Carbon dioxide

d) Nitrogen with trace refrigerant

Rationale: Dry nitrogen with trace refrigerant prevents contamination and

allows leak detection.

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