OHIO MAINTENANCE TECHNICIAN EXAM –200 UNIQUE
PRACTICE QUESTIONS WITH VERIFIED ANSWERS &
RATIONALES
1. What is the primary purpose of a ground fault circuit interrupter in
a wet environment?
A. Increase voltage
B. Protect equipment from surges
C. Protect personnel from electric shock
D. Measure current
Rationale: GFCIs detect small current imbalances and quickly interrupt
power to prevent shock.
2. Which maintenance strategy uses vibration analysis to predict
failures?
A. Reactive maintenance
B. Predictive maintenance
C. Preventive maintenance
D. Emergency maintenance
Rationale: Predictive maintenance relies on condition monitoring to
schedule repairs before failure.
3. What is the correct procedure when removing a lockout device
applied by another worker?
A. Cut the lock immediately
B. Follow the employer’s written removal procedure
C. Ask the operator to remove it
D. Wait until the next shift
Rationale: OSHA requires a specific documented procedure for
removing another person’s lock.
,4. Which tool is best for measuring the depth of a blind hole?
A. Outside micrometer
B. Depth micrometer
C. Feeler gauge
D. Telescoping gauge
Rationale: Depth micrometers measure the depth of holes and
recesses.
5. What does a yellow tag on a locked-out energy isolating device
indicate?
A. Equipment is safe to start
B. Equipment must not be operated
C. Equipment is due for inspection
D. Equipment is out of service for cleaning only
Rationale: A danger tag warns that the equipment must not be
energized.
6. Which of the following is a common cause of hydraulic pump
cavitation?
A. Restricted inlet flow
B. Excessive fluid viscosity
C. Too much filtration
D. High fluid level
Rationale: Restricted inlet flow lowers pressure and causes vapor
bubbles.
7. What is the function of a PLC input card?
A. Control external devices
B. Convert sensor signals to digital data
C. Supply power to the processor
,D. Store the program
Rationale: Input cards receive signals from sensors and convert them for
the PLC.
8. Which bearing type is designed primarily for radial loads?
A. Radial ball bearing
B. Thrust bearing
C. Cylindrical roller bearing
D. Needle bearing
Rationale: Radial ball bearings support loads perpendicular to the shaft.
9. What is the first step in troubleshooting a mechanical problem?
A. Replace parts
B. Verify the problem and gather information
C. Disassemble the machine
D. Adjust settings
Rationale: Effective troubleshooting begins with understanding
symptoms and history.
10. Which of the following is a sign of a failing chain drive?
A. Smooth operation
B. Elongation and tight spots
C. Correct tension
D. Even wear
Rationale: Chain elongation and tight spots indicate wear and need for
replacement.
11. What is the purpose of a pneumatic check valve?
A. Regulate air pressure
B. Allow flow in one direction only
C. Remove moisture
, D. Lubricate air tools
Rationale: Check valves prevent reverse flow in pneumatic circuits.
12. Which document should be consulted before handling an
unknown chemical?
A. Work order
B. Safety data sheet
C. Maintenance log
D. Purchase order
Rationale: The SDS provides hazard, handling, and emergency
information.
13. What is the main function of a centrifugal pump volute?
A. Seal the shaft
B. Convert velocity to pressure
C. Filter debris
D. Measure flow rate
Rationale: The volute casing converts kinetic energy into pressure.
14. Which of the following is a preventive maintenance task for a
gearbox?
A. Checking oil level and condition
B. Replacing gears annually
C. Rebuilding every month
D. Increasing load
Rationale: Regular oil checks prevent wear and overheating.
15. What does a steady red indicator on an HMI typically mean?
A. System is normal
B. Fault or alarm condition
C. System is in manual mode
PRACTICE QUESTIONS WITH VERIFIED ANSWERS &
RATIONALES
1. What is the primary purpose of a ground fault circuit interrupter in
a wet environment?
A. Increase voltage
B. Protect equipment from surges
C. Protect personnel from electric shock
D. Measure current
Rationale: GFCIs detect small current imbalances and quickly interrupt
power to prevent shock.
2. Which maintenance strategy uses vibration analysis to predict
failures?
A. Reactive maintenance
B. Predictive maintenance
C. Preventive maintenance
D. Emergency maintenance
Rationale: Predictive maintenance relies on condition monitoring to
schedule repairs before failure.
3. What is the correct procedure when removing a lockout device
applied by another worker?
A. Cut the lock immediately
B. Follow the employer’s written removal procedure
C. Ask the operator to remove it
D. Wait until the next shift
Rationale: OSHA requires a specific documented procedure for
removing another person’s lock.
,4. Which tool is best for measuring the depth of a blind hole?
A. Outside micrometer
B. Depth micrometer
C. Feeler gauge
D. Telescoping gauge
Rationale: Depth micrometers measure the depth of holes and
recesses.
5. What does a yellow tag on a locked-out energy isolating device
indicate?
A. Equipment is safe to start
B. Equipment must not be operated
C. Equipment is due for inspection
D. Equipment is out of service for cleaning only
Rationale: A danger tag warns that the equipment must not be
energized.
6. Which of the following is a common cause of hydraulic pump
cavitation?
A. Restricted inlet flow
B. Excessive fluid viscosity
C. Too much filtration
D. High fluid level
Rationale: Restricted inlet flow lowers pressure and causes vapor
bubbles.
7. What is the function of a PLC input card?
A. Control external devices
B. Convert sensor signals to digital data
C. Supply power to the processor
,D. Store the program
Rationale: Input cards receive signals from sensors and convert them for
the PLC.
8. Which bearing type is designed primarily for radial loads?
A. Radial ball bearing
B. Thrust bearing
C. Cylindrical roller bearing
D. Needle bearing
Rationale: Radial ball bearings support loads perpendicular to the shaft.
9. What is the first step in troubleshooting a mechanical problem?
A. Replace parts
B. Verify the problem and gather information
C. Disassemble the machine
D. Adjust settings
Rationale: Effective troubleshooting begins with understanding
symptoms and history.
10. Which of the following is a sign of a failing chain drive?
A. Smooth operation
B. Elongation and tight spots
C. Correct tension
D. Even wear
Rationale: Chain elongation and tight spots indicate wear and need for
replacement.
11. What is the purpose of a pneumatic check valve?
A. Regulate air pressure
B. Allow flow in one direction only
C. Remove moisture
, D. Lubricate air tools
Rationale: Check valves prevent reverse flow in pneumatic circuits.
12. Which document should be consulted before handling an
unknown chemical?
A. Work order
B. Safety data sheet
C. Maintenance log
D. Purchase order
Rationale: The SDS provides hazard, handling, and emergency
information.
13. What is the main function of a centrifugal pump volute?
A. Seal the shaft
B. Convert velocity to pressure
C. Filter debris
D. Measure flow rate
Rationale: The volute casing converts kinetic energy into pressure.
14. Which of the following is a preventive maintenance task for a
gearbox?
A. Checking oil level and condition
B. Replacing gears annually
C. Rebuilding every month
D. Increasing load
Rationale: Regular oil checks prevent wear and overheating.
15. What does a steady red indicator on an HMI typically mean?
A. System is normal
B. Fault or alarm condition
C. System is in manual mode
