MILLWRIGHT JOURNEYMAN
CERTIFICATION EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. What is the primary responsibility of a millwright?
A. Electrical wiring
B. Fabrication of concrete
C. Installation and maintenance of industrial machinery
D. HVAC system design
Rationale: Millwrights specialize in installing, aligning, maintaining, and
repairing industrial machinery.
2. Which tool is most commonly used to check shaft alignment?
A. Tape measure
B. Spirit level
C. Dial indicator
D. Vernier caliper
Rationale: Dial indicators provide precise measurement for shaft and
coupling alignment.
3. What type of bearing is best suited for high radial loads?
A. Thrust bearing
B. Needle bearing
C. Roller bearing
D. Ball bearing
Rationale: Roller bearings distribute loads over a larger surface area,
handling high radial loads effectively.
,4. Which lubricant property indicates resistance to flow?
A. Flash point
B. Density
C. Viscosity
D. Pour point
Rationale: Viscosity measures a lubricant’s resistance to flow.
5. The main purpose of a coupling is to:
A. Reduce friction
B. Change speed
C. Connect two rotating shafts
D. Absorb heat
Rationale: Couplings transmit torque between aligned or slightly
misaligned shafts.
6. Which fastener is designed to resist loosening under vibration?
A. Flat washer
B. Hex bolt
C. Lock nut
D. Lag screw
Rationale: Lock nuts are designed to maintain tension under vibration.
7. What unit is commonly used to measure torque?
A. Pascal
B. Joule
C. Newton-meter
D. Watt
Rationale: Torque is measured as force times distance, commonly in
Newton-meters.
8. What causes excessive vibration in rotating equipment?
A. Proper lubrication
B. Correct alignment
C. Imbalance
D. Stable foundation
Rationale: Imbalance creates uneven centrifugal forces, leading to
vibration.
, 9. Which gear type is best for transmitting motion between parallel shafts?
A. Bevel gear
B. Worm gear
C. Spur gear
D. Hypoid gear
Rationale: Spur gears are designed for parallel shaft applications.
10.What safety device prevents machinery from starting during maintenance?
A. Fuse
B. Grounding wire
C. Lockout/tagout device
D. Circuit breaker
Rationale: Lockout/tagout ensures equipment remains de-energized
during servicing.
11.Which material is commonly used for machine bases due to vibration
damping?
A. Aluminum
B. Steel
C. Cast iron
D. Copper
Rationale: Cast iron absorbs vibration better than most metals.
12.What is the purpose of shimming machinery?
A. Increase speed
B. Reduce heat
C. Achieve proper alignment and level
D. Improve lubrication
Rationale: Shims are used to fine-tune alignment and leveling.
13.Which hand tool is used to cut internal threads?
A. Die
B. Reamer
C. Tap
D. File
Rationale: Taps are designed for cutting internal threads.
CERTIFICATION EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. What is the primary responsibility of a millwright?
A. Electrical wiring
B. Fabrication of concrete
C. Installation and maintenance of industrial machinery
D. HVAC system design
Rationale: Millwrights specialize in installing, aligning, maintaining, and
repairing industrial machinery.
2. Which tool is most commonly used to check shaft alignment?
A. Tape measure
B. Spirit level
C. Dial indicator
D. Vernier caliper
Rationale: Dial indicators provide precise measurement for shaft and
coupling alignment.
3. What type of bearing is best suited for high radial loads?
A. Thrust bearing
B. Needle bearing
C. Roller bearing
D. Ball bearing
Rationale: Roller bearings distribute loads over a larger surface area,
handling high radial loads effectively.
,4. Which lubricant property indicates resistance to flow?
A. Flash point
B. Density
C. Viscosity
D. Pour point
Rationale: Viscosity measures a lubricant’s resistance to flow.
5. The main purpose of a coupling is to:
A. Reduce friction
B. Change speed
C. Connect two rotating shafts
D. Absorb heat
Rationale: Couplings transmit torque between aligned or slightly
misaligned shafts.
6. Which fastener is designed to resist loosening under vibration?
A. Flat washer
B. Hex bolt
C. Lock nut
D. Lag screw
Rationale: Lock nuts are designed to maintain tension under vibration.
7. What unit is commonly used to measure torque?
A. Pascal
B. Joule
C. Newton-meter
D. Watt
Rationale: Torque is measured as force times distance, commonly in
Newton-meters.
8. What causes excessive vibration in rotating equipment?
A. Proper lubrication
B. Correct alignment
C. Imbalance
D. Stable foundation
Rationale: Imbalance creates uneven centrifugal forces, leading to
vibration.
, 9. Which gear type is best for transmitting motion between parallel shafts?
A. Bevel gear
B. Worm gear
C. Spur gear
D. Hypoid gear
Rationale: Spur gears are designed for parallel shaft applications.
10.What safety device prevents machinery from starting during maintenance?
A. Fuse
B. Grounding wire
C. Lockout/tagout device
D. Circuit breaker
Rationale: Lockout/tagout ensures equipment remains de-energized
during servicing.
11.Which material is commonly used for machine bases due to vibration
damping?
A. Aluminum
B. Steel
C. Cast iron
D. Copper
Rationale: Cast iron absorbs vibration better than most metals.
12.What is the purpose of shimming machinery?
A. Increase speed
B. Reduce heat
C. Achieve proper alignment and level
D. Improve lubrication
Rationale: Shims are used to fine-tune alignment and leveling.
13.Which hand tool is used to cut internal threads?
A. Die
B. Reamer
C. Tap
D. File
Rationale: Taps are designed for cutting internal threads.
