Millwright Journeyman Certification
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
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1. What is the primary purpose of a millwright?
A. Electrical wiring
B. Installing and maintaining industrial machinery
C. Programming CNC machines
D. Painting equipment
Answer: B
Rationale: Millwrights specialize in installing, maintaining,
troubleshooting, and repairing industrial machinery.
2. Which tool is used to check shaft alignment?
A. Torque wrench
B. Dial indicator
C. Feeler gauge
D. Pipe wrench
Answer: B
Rationale: A dial indicator measures runout and alignment accuracy
between rotating components.
,3. What is the function of a key in a shaft assembly?
A. Reduce friction
B. Transmit torque
C. Seal components
D. Absorb vibration
Answer: B
Rationale: Keys lock rotating elements like gears or pulleys to shafts to
transmit torque.
4. Which type of bearing supports both radial and axial loads?
A. Ball bearing
B. Thrust bearing
C. Roller bearing
D. Journal bearing
Answer: A
Rationale: Ball bearings can handle both radial and axial loads depending
on design.
5. What is backlash in gear systems?
A. Gear overheating
B. Excessive lubrication
C. Clearance between mating teeth
D. Shaft misalignment
Answer: C
Rationale: Backlash is the small gap between gear teeth to allow smooth
operation.
6. What is the purpose of shimming?
A. Increase lubrication
B. Adjust alignment
C. Reduce noise
D. Clean surfaces
Answer: B
, Rationale: Shims are used to adjust alignment and positioning of
machinery components.
7. Which lubricant is best for high-speed bearings?
A. Grease
B. Oil
C. Water
D. Wax
Answer: B
Rationale: Oil provides better cooling and flow for high-speed
applications.
8. What is a common cause of bearing failure?
A. Proper lubrication
B. Misalignment
C. Correct installation
D. Balanced loads
Answer: B
Rationale: Misalignment causes uneven stress and premature bearing
wear.
9. What is the purpose of a coupling?
A. Reduce speed
B. Connect shafts
C. Increase torque
D. Store energy
Answer: B
Rationale: Couplings connect two shafts for power transmission.
10.Which instrument measures flatness?
A. Micrometer
B. Surface plate
C. Dial indicator
D. Caliper
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
1. What is the primary purpose of a millwright?
A. Electrical wiring
B. Installing and maintaining industrial machinery
C. Programming CNC machines
D. Painting equipment
Answer: B
Rationale: Millwrights specialize in installing, maintaining,
troubleshooting, and repairing industrial machinery.
2. Which tool is used to check shaft alignment?
A. Torque wrench
B. Dial indicator
C. Feeler gauge
D. Pipe wrench
Answer: B
Rationale: A dial indicator measures runout and alignment accuracy
between rotating components.
,3. What is the function of a key in a shaft assembly?
A. Reduce friction
B. Transmit torque
C. Seal components
D. Absorb vibration
Answer: B
Rationale: Keys lock rotating elements like gears or pulleys to shafts to
transmit torque.
4. Which type of bearing supports both radial and axial loads?
A. Ball bearing
B. Thrust bearing
C. Roller bearing
D. Journal bearing
Answer: A
Rationale: Ball bearings can handle both radial and axial loads depending
on design.
5. What is backlash in gear systems?
A. Gear overheating
B. Excessive lubrication
C. Clearance between mating teeth
D. Shaft misalignment
Answer: C
Rationale: Backlash is the small gap between gear teeth to allow smooth
operation.
6. What is the purpose of shimming?
A. Increase lubrication
B. Adjust alignment
C. Reduce noise
D. Clean surfaces
Answer: B
, Rationale: Shims are used to adjust alignment and positioning of
machinery components.
7. Which lubricant is best for high-speed bearings?
A. Grease
B. Oil
C. Water
D. Wax
Answer: B
Rationale: Oil provides better cooling and flow for high-speed
applications.
8. What is a common cause of bearing failure?
A. Proper lubrication
B. Misalignment
C. Correct installation
D. Balanced loads
Answer: B
Rationale: Misalignment causes uneven stress and premature bearing
wear.
9. What is the purpose of a coupling?
A. Reduce speed
B. Connect shafts
C. Increase torque
D. Store energy
Answer: B
Rationale: Couplings connect two shafts for power transmission.
10.Which instrument measures flatness?
A. Micrometer
B. Surface plate
C. Dial indicator
D. Caliper
