Millwright Journeyman Certification Exam
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. Which of the following is the primary function of a millwright?
A. Electrical wiring
B. Precision machinery installation and maintenance
C. Carpentry
D. Welding
Answer: B
Rationale: A millwright’s main role is installing, maintaining, and
repairing industrial machinery and equipment with precision. While
millwrights may perform related tasks like welding or electrical work,
these are secondary to their primary function.
2. When aligning a shaft using a dial indicator, the acceptable
misalignment is usually measured in:
A. Inches
B. Millimeters
, C. Thousandths of an inch
D. Centimeters
Answer: C
Rationale: Shaft alignment requires extremely precise measurements,
typically in thousandths of an inch, to prevent excessive wear,
vibration, and premature failure of machinery.
3. A V-belt drive that is slipping is most likely caused by:
A. Correct belt tension
B. Worn pulleys or belt
C. Proper alignment
D. Lubricated bearings
Answer: B
Rationale: Slippage in a V-belt drive generally results from worn belts
or pulleys, incorrect tension, or improper alignment. Lubrication of
bearings does not affect belt grip.
4. Which type of crane is most commonly used for lifting heavy
machinery in a shop environment?
A. Overhead bridge crane
B. Jib crane
C. Gantry crane
D. Tower crane
,Answer: A
Rationale: Overhead bridge cranes are standard in shops and factories
for moving heavy equipment along a fixed path. Jib cranes and gantry
cranes are used in smaller or portable applications, while tower cranes
are for construction.
5. A keyway in a shaft is used to:
A. Reduce vibration
B. Lock components to the shaft
C. Allow thermal expansion
D. Prevent corrosion
Answer: B
Rationale: Keyways are slots machined into a shaft to accept a key
that locks components like gears or pulleys in place, transmitting
torque effectively.
6. Before welding a machine frame, a millwright should always:
A. Apply lubricant
B. Verify machine level and alignment
C. Paint the frame
D. Measure electrical resistance
Answer: B
Rationale: Welding can distort metal; verifying the level and
, alignment beforehand ensures the final installation meets precision
requirements.
7. What type of fit is commonly used for coupling two shafts that
require easy assembly and disassembly?
A. Interference fit
B. Clearance fit
C. Transition fit
D. Shrink fit
Answer: B
Rationale: Clearance fits provide enough space to assemble and
disassemble shafts and couplings without forcing components, while
interference fits are permanent.
8. When using a torque wrench, the correct procedure is to:
A. Use the wrench like a hammer
B. Apply force slowly until the desired torque is reached
C. Exceed the wrench’s maximum rating for accuracy
D. Turn the wrench rapidly
Answer: B
Rationale: Torque wrenches must be used with controlled force to
achieve precise torque settings; rapid or excessive force can damage
the wrench or fastener.
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which of the following is the primary function of a millwright?
A. Electrical wiring
B. Precision machinery installation and maintenance
C. Carpentry
D. Welding
Answer: B
Rationale: A millwright’s main role is installing, maintaining, and
repairing industrial machinery and equipment with precision. While
millwrights may perform related tasks like welding or electrical work,
these are secondary to their primary function.
2. When aligning a shaft using a dial indicator, the acceptable
misalignment is usually measured in:
A. Inches
B. Millimeters
, C. Thousandths of an inch
D. Centimeters
Answer: C
Rationale: Shaft alignment requires extremely precise measurements,
typically in thousandths of an inch, to prevent excessive wear,
vibration, and premature failure of machinery.
3. A V-belt drive that is slipping is most likely caused by:
A. Correct belt tension
B. Worn pulleys or belt
C. Proper alignment
D. Lubricated bearings
Answer: B
Rationale: Slippage in a V-belt drive generally results from worn belts
or pulleys, incorrect tension, or improper alignment. Lubrication of
bearings does not affect belt grip.
4. Which type of crane is most commonly used for lifting heavy
machinery in a shop environment?
A. Overhead bridge crane
B. Jib crane
C. Gantry crane
D. Tower crane
,Answer: A
Rationale: Overhead bridge cranes are standard in shops and factories
for moving heavy equipment along a fixed path. Jib cranes and gantry
cranes are used in smaller or portable applications, while tower cranes
are for construction.
5. A keyway in a shaft is used to:
A. Reduce vibration
B. Lock components to the shaft
C. Allow thermal expansion
D. Prevent corrosion
Answer: B
Rationale: Keyways are slots machined into a shaft to accept a key
that locks components like gears or pulleys in place, transmitting
torque effectively.
6. Before welding a machine frame, a millwright should always:
A. Apply lubricant
B. Verify machine level and alignment
C. Paint the frame
D. Measure electrical resistance
Answer: B
Rationale: Welding can distort metal; verifying the level and
, alignment beforehand ensures the final installation meets precision
requirements.
7. What type of fit is commonly used for coupling two shafts that
require easy assembly and disassembly?
A. Interference fit
B. Clearance fit
C. Transition fit
D. Shrink fit
Answer: B
Rationale: Clearance fits provide enough space to assemble and
disassemble shafts and couplings without forcing components, while
interference fits are permanent.
8. When using a torque wrench, the correct procedure is to:
A. Use the wrench like a hammer
B. Apply force slowly until the desired torque is reached
C. Exceed the wrench’s maximum rating for accuracy
D. Turn the wrench rapidly
Answer: B
Rationale: Torque wrenches must be used with controlled force to
achieve precise torque settings; rapid or excessive force can damage
the wrench or fastener.
