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NCCER Industrial Maintenance
Machanic| Exam Review 2025/2026|
Updated Questions and Answers
A maintenance tech is troubleshooting a pump that's vibrating more than usual after startup.
Could be misalignment between the motor and pump shaft. Happens a lot if the base
wasn't shimmed right or bolts got loose.
You're sent to fix a gearbox that's leaking oil at the seal.
Most likely the shaft seal's worn out or damaged. Could also be overfilled or pressurized
too much.
During an inspection, a tech notices belt dust around a V-belt drive.
Usually means the belt's slipping or misaligned. Might be too loose or running on worn
pulleys.
An air compressor keeps short cycling even when demand is steady.
Probably the pressure switch is faulty or set too close to cut-in/cut-out. Could also be a
tank leak.
A motor keeps overheating after running for just a few minutes.
Could be a blocked cooling fan, overloaded conditions, or bad bearings causing extra
friction.
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A tech notices pitting on gear teeth in a reducer.
That’s often from poor lubrication — wrong oil type, contaminated oil, or just not
enough of it.
A bearing keeps failing early even though it's the right size and type.
Might be due to poor installation — like hammering it in — or contamination like dust
and water.
A conveyor keeps drifting to one side during operation.
Usually means the belt's out of alignment or tension isn't even across the pulleys.
While checking a hydraulic system, the cylinder extends slowly under load.
Could be internal leakage in the cylinder or the pump not generating enough pressure.
A centrifugal pump isn’t building pressure even though it’s spinning.
Most likely the impeller's damaged, or the pump’s not primed and is just spinning air.
While doing preventive maintenance, a tech hears a high-pitched whining from a motor.
Could be bearing issues or electrical imbalance in the windings. Needs checking fast.
NCCER Industrial Maintenance
Machanic| Exam Review 2025/2026|
Updated Questions and Answers
A maintenance tech is troubleshooting a pump that's vibrating more than usual after startup.
Could be misalignment between the motor and pump shaft. Happens a lot if the base
wasn't shimmed right or bolts got loose.
You're sent to fix a gearbox that's leaking oil at the seal.
Most likely the shaft seal's worn out or damaged. Could also be overfilled or pressurized
too much.
During an inspection, a tech notices belt dust around a V-belt drive.
Usually means the belt's slipping or misaligned. Might be too loose or running on worn
pulleys.
An air compressor keeps short cycling even when demand is steady.
Probably the pressure switch is faulty or set too close to cut-in/cut-out. Could also be a
tank leak.
A motor keeps overheating after running for just a few minutes.
Could be a blocked cooling fan, overloaded conditions, or bad bearings causing extra
friction.
, 2
A tech notices pitting on gear teeth in a reducer.
That’s often from poor lubrication — wrong oil type, contaminated oil, or just not
enough of it.
A bearing keeps failing early even though it's the right size and type.
Might be due to poor installation — like hammering it in — or contamination like dust
and water.
A conveyor keeps drifting to one side during operation.
Usually means the belt's out of alignment or tension isn't even across the pulleys.
While checking a hydraulic system, the cylinder extends slowly under load.
Could be internal leakage in the cylinder or the pump not generating enough pressure.
A centrifugal pump isn’t building pressure even though it’s spinning.
Most likely the impeller's damaged, or the pump’s not primed and is just spinning air.
While doing preventive maintenance, a tech hears a high-pitched whining from a motor.
Could be bearing issues or electrical imbalance in the windings. Needs checking fast.
