Ohio Millwright Certification Exam

Ohio Millwright Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• When leveling machinery, what is the primary purpose of using a

machinist’s precision level?

• To verify electrical grounding
• To ensure machinery is square
• To ensure machinery is perfectly level
• To check shaft alignment

Rationale: A precision level ensures the machine bed or base is

perfectly level to prevent uneven wear and operational issues.

2. A torque wrench is used to:

• Measure vibration in bearings
• Align couplings
• Apply precise tightening force to fasteners
• Check shaft runout 1 / 3

Rationale: Torque wrenches apply controlled force to bolts to avoid

over- or under-tightening.

• Which type of coupling is best for minor misalignment and flexibility?
• Rigid coupling
• Flexible coupling
• Jaw coupling
• Split coupling

Rationale: Flexible couplings absorb slight misalignment and reduce

stress on rotating shafts.

4. The primary purpose of a dial indicator is to measure:

• Bolt torque
• Shaft runout or alignment
• Lubrication viscosity
• Pipe diameter

Rationale: Dial indicators precisely measure small deviations in

movement or position.

5. When lifting heavy equipment, the best safety practice is to:

• Lift as quickly as possible
• Avoid using slings
• Use proper rigging and lifting equipment
• Estimate weight by appearance

Rationale: Proper rigging prevents dropping, tipping, or injury. 2 / 3

6. The primary function of shims under machinery bases is to:

• Increase friction
• Reduce vibration
• Adjust machine height and level
• Fasten the machine to the floor

Rationale: Shims change elevation to precisely level a machine.

7. V-belt tension that is too tight may cause:

• Belt slippage
• Premature bearing failure
• Increased belt life
• Lower vibration

Rationale: Overtight belts overload bearings, causing heat and

failure.

8. A laser alignment tool is primarily used to:

• Inspect bearings
• Align rotating shafts
• Measure belt tension
• Check motor RPM

Rationale: Laser systems provide precision shaft alignment.

9. The term “runout” refers to:

• Temperature rise in bearings
• Deviation from true circular rotation
• Incorrect belt size
• / 3