INDUSTRIAL MAINTENANCE MECHANIC
CERTIFICATION EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF
1.
What is the primary function of a coupling in a mechanical system?
A) To increase torque
B) To connect two shafts for power transmission
C) To reduce vibration only
D) To support bearings
Couplings connect two rotating shafts to transmit power while allowing
slight misalignment.
2.
What tool is commonly used to check shaft alignment?
A) Feeler gauge
B) Dial indicator
C) Micrometer
D) Torque wrench
Dial indicators measure shaft runout and misalignment with high
precision.
,3.
Which type of bearing uses rolling elements such as balls or rollers?
A) Sleeve bearing
B) Anti-friction bearing
C) Thrust washer
D) Journal bearing
Anti-friction bearings reduce friction by rolling rather than sliding.
4.
What is the function of a mechanical seal?
A) To increase lubrication
B) To prevent leakage of fluids along rotating shafts
C) To reduce vibration
D) To support shaft load
Mechanical seals prevent fluid leakage between rotating and stationary
components.
5.
The unit of power most commonly used in mechanical systems is:
A) Joule
B) Newton
C) Horsepower
D) Volt
Horsepower is the standard unit of mechanical power output.
6.
,Which instrument is used to measure the tension of a belt?
A) Micrometer
B) Feeler gauge
C) Belt tension gauge
D) Vernier caliper
Belt tension gauges measure proper tension to prevent slippage or
bearing wear.
7.
Which alignment method uses laser beams to measure shaft
misalignment?
A) Rim and face method
B) Reverse dial method
C) Laser alignment method
D) Optical plumb method
Laser alignment provides the highest accuracy and speed for shaft
alignment.
8.
What type of maintenance is performed at regular intervals regardless
of condition?
A) Predictive
B) Preventive
C) Corrective
D) Reactive
Preventive maintenance is scheduled to reduce equipment breakdown
risk.
, 9.
Which instrument measures rotational speed?
A) Manometer
B) Tachometer
C) Pyrometer
D) Barometer
Tachometers measure RPM (revolutions per minute) of rotating
equipment.
10.
Which of the following is a sign of bearing failure?
A) Smooth operation
B) Steady temperature
C) Excessive vibration and noise
D) Normal lubrication
Noise and vibration indicate worn bearing surfaces or lack of
lubrication.
11.
What is the typical cause of a belt slipping on a pulley?
A) Tight belt tension
B) Insufficient belt tension
C) Misaligned bearings
D) Lubrication on pulley
Low tension or oil contamination causes belt slippage.
12.
CERTIFICATION EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF
1.
What is the primary function of a coupling in a mechanical system?
A) To increase torque
B) To connect two shafts for power transmission
C) To reduce vibration only
D) To support bearings
Couplings connect two rotating shafts to transmit power while allowing
slight misalignment.
2.
What tool is commonly used to check shaft alignment?
A) Feeler gauge
B) Dial indicator
C) Micrometer
D) Torque wrench
Dial indicators measure shaft runout and misalignment with high
precision.
,3.
Which type of bearing uses rolling elements such as balls or rollers?
A) Sleeve bearing
B) Anti-friction bearing
C) Thrust washer
D) Journal bearing
Anti-friction bearings reduce friction by rolling rather than sliding.
4.
What is the function of a mechanical seal?
A) To increase lubrication
B) To prevent leakage of fluids along rotating shafts
C) To reduce vibration
D) To support shaft load
Mechanical seals prevent fluid leakage between rotating and stationary
components.
5.
The unit of power most commonly used in mechanical systems is:
A) Joule
B) Newton
C) Horsepower
D) Volt
Horsepower is the standard unit of mechanical power output.
6.
,Which instrument is used to measure the tension of a belt?
A) Micrometer
B) Feeler gauge
C) Belt tension gauge
D) Vernier caliper
Belt tension gauges measure proper tension to prevent slippage or
bearing wear.
7.
Which alignment method uses laser beams to measure shaft
misalignment?
A) Rim and face method
B) Reverse dial method
C) Laser alignment method
D) Optical plumb method
Laser alignment provides the highest accuracy and speed for shaft
alignment.
8.
What type of maintenance is performed at regular intervals regardless
of condition?
A) Predictive
B) Preventive
C) Corrective
D) Reactive
Preventive maintenance is scheduled to reduce equipment breakdown
risk.
, 9.
Which instrument measures rotational speed?
A) Manometer
B) Tachometer
C) Pyrometer
D) Barometer
Tachometers measure RPM (revolutions per minute) of rotating
equipment.
10.
Which of the following is a sign of bearing failure?
A) Smooth operation
B) Steady temperature
C) Excessive vibration and noise
D) Normal lubrication
Noise and vibration indicate worn bearing surfaces or lack of
lubrication.
11.
What is the typical cause of a belt slipping on a pulley?
A) Tight belt tension
B) Insufficient belt tension
C) Misaligned bearings
D) Lubrication on pulley
Low tension or oil contamination causes belt slippage.
12.
