Oklahoma Industrial Maintenance
Mechanic Assessment Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf.
1. Which maintenance strategy is based primarily on scheduled
inspections, servicing, lubrication, and component replacement at
predetermined intervals to reduce the likelihood of unexpected
equipment failure?
A. Corrective maintenance
B. Predictive maintenance
C. Preventive maintenance
D. Emergency maintenance
Preventive maintenance is performed according to predetermined
schedules or usage intervals so that equipment can be serviced before
deterioration develops into a failure.
, 2. Before beginning maintenance on an electrically driven industrial
machine, which procedure provides the primary protection against
unexpected energization?
A. Increasing the motor overload setting
B. Applying lockout/tagout procedures
C. Opening the machine enclosure
D. Removing the drive belt
Lockout/tagout requires hazardous energy sources to be isolated, locked,
and verified before maintenance begins, preventing unexpected startup or
energy release.
3. What is the primary function of a mechanical bearing in industrial
machinery?
A. Increase electrical resistance
B. Store hydraulic pressure
C. Reduce friction between moving components
D. Increase shaft temperature
Bearings support rotating or moving components while reducing friction
and controlling the relative movement between machine parts.
4. Excessive vibration in a rotating machine is commonly associated with
which condition?
,A. Proper shaft alignment
B. Correct lubrication
C. Adequate foundation stiffness
D. Imbalance or misalignment
Rotational imbalance and shaft or coupling misalignment are common
sources of abnormal vibration and should be investigated during condition
monitoring.
5. When aligning two coupled shafts, which condition is being corrected
when the shafts are made collinear?
A. Angular velocity
B. Axial clearance
C. Shaft alignment
D. Bearing preload
Shaft alignment establishes the correct geometric relationship between
connected shafts, minimizing forces and vibration transmitted through the
coupling and bearings.
6. Which instrument is most appropriate for accurately measuring the
outside diameter of a small shaft?
A. Steel ruler
B. Feeler gauge
, C. Micrometer
D. Pipe wrench
A micrometer provides precise dimensional measurement and is commonly
used to determine shaft diameters and other close-tolerance dimensions.
7. What is the primary purpose of a dial indicator during machinery
alignment?
A. Measure electrical current
B. Determine lubricant viscosity
C. Detect small deviations in position or alignment
D. Measure hydraulic pressure
Dial indicators detect very small positional changes and are frequently
used to identify shaft runout and coupling alignment errors.
8. A belt-driven machine repeatedly throws its belt from the pulleys.
Which condition should be investigated first?
A. Excessive electrical voltage
B. Pulley misalignment or improper belt tension
C. Low hydraulic pressure
D. Excessive bearing insulation
Mechanic Assessment Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf.
1. Which maintenance strategy is based primarily on scheduled
inspections, servicing, lubrication, and component replacement at
predetermined intervals to reduce the likelihood of unexpected
equipment failure?
A. Corrective maintenance
B. Predictive maintenance
C. Preventive maintenance
D. Emergency maintenance
Preventive maintenance is performed according to predetermined
schedules or usage intervals so that equipment can be serviced before
deterioration develops into a failure.
, 2. Before beginning maintenance on an electrically driven industrial
machine, which procedure provides the primary protection against
unexpected energization?
A. Increasing the motor overload setting
B. Applying lockout/tagout procedures
C. Opening the machine enclosure
D. Removing the drive belt
Lockout/tagout requires hazardous energy sources to be isolated, locked,
and verified before maintenance begins, preventing unexpected startup or
energy release.
3. What is the primary function of a mechanical bearing in industrial
machinery?
A. Increase electrical resistance
B. Store hydraulic pressure
C. Reduce friction between moving components
D. Increase shaft temperature
Bearings support rotating or moving components while reducing friction
and controlling the relative movement between machine parts.
4. Excessive vibration in a rotating machine is commonly associated with
which condition?
,A. Proper shaft alignment
B. Correct lubrication
C. Adequate foundation stiffness
D. Imbalance or misalignment
Rotational imbalance and shaft or coupling misalignment are common
sources of abnormal vibration and should be investigated during condition
monitoring.
5. When aligning two coupled shafts, which condition is being corrected
when the shafts are made collinear?
A. Angular velocity
B. Axial clearance
C. Shaft alignment
D. Bearing preload
Shaft alignment establishes the correct geometric relationship between
connected shafts, minimizing forces and vibration transmitted through the
coupling and bearings.
6. Which instrument is most appropriate for accurately measuring the
outside diameter of a small shaft?
A. Steel ruler
B. Feeler gauge
, C. Micrometer
D. Pipe wrench
A micrometer provides precise dimensional measurement and is commonly
used to determine shaft diameters and other close-tolerance dimensions.
7. What is the primary purpose of a dial indicator during machinery
alignment?
A. Measure electrical current
B. Determine lubricant viscosity
C. Detect small deviations in position or alignment
D. Measure hydraulic pressure
Dial indicators detect very small positional changes and are frequently
used to identify shaft runout and coupling alignment errors.
8. A belt-driven machine repeatedly throws its belt from the pulleys.
Which condition should be investigated first?
A. Excessive electrical voltage
B. Pulley misalignment or improper belt tension
C. Low hydraulic pressure
D. Excessive bearing insulation
