OHIO MAINTENANCE TECHNICIAN EXAM COMPLETE EXAM
QUESTIONS AND VERIFIED ANSWERS | 2026–2027 LATEST
UPDATE | GUARANTEED PASS | DETAILED RATIONALES |
FULL STUDY GUIDE | EXAM PREP | PRACTICE TEST |
CERTIFICATION PREPARATION
SECTION ONE: QUESTIONS 1–100
1. A technician is preparing to service a conveyor motor that has jammed mid-shift. According to
OSHA's Control of Hazardous Energy standard, what must occur before any maintenance work
begins?
A) The technician should notify the supervisor and begin work immediately.
B) The energy source must be isolated, locked out, and tagged.
C) The conveyor should be restarted to verify the jam.
D) A work order must be submitted to the maintenance department.
Correct Answer: B) The energy source must be isolated, locked out, and tagged.
Rationale: OSHA 29 CFR 1910.147 requires that hazardous energy be isolated and controlled before
servicing. Lockout/tagout prevents unexpected energization or release of stored energy. Notification
is important but is not the primary protective step. Restarting a jammed conveyor risks injury. Work
orders are administrative, not safety controls.
2. During routine inspection of a commercial HVAC unit, a technician discovers the compressor is
drawing higher-than-normal amperage while running. Which condition is most likely responsible?
A) The refrigerant charge is slightly low.
B) The condenser coil is clean and free-flowing.
C) The compressor is experiencing mechanical binding or bearing wear.
D) The thermostat is set to a lower temperature than usual.
Correct Answer: C) The compressor is experiencing mechanical binding or bearing wear.
Rationale: Increased amperage draw typically indicates the compressor is working harder due to
mechanical resistance. Bearing wear or internal binding forces the motor to draw more current. Low
refrigerant charge reduces load, not increases it. A clean condenser improves efficiency. Thermostat
settings affect runtime, not amperage draw.
3. A maintenance technician notices a slight vibration and humming noise from a recently installed
three-phase motor. Which factor should be investigated first?
A) The start capacitor may have failed.
B) The motor may be misaligned with the driven load.
,C) The refrigerant charge may be low.
D) The bearing may be completely seized.
Correct Answer: B) The motor may be misaligned with the driven load.
Rationale: Vibration and humming in three-phase motors commonly result from misalignment or
voltage imbalance. Misalignment causes uneven loading and vibration. A failed start capacitor
affects single-phase motors. Refrigerant charge is unrelated to motor vibration. A seized bearing
would prevent rotation entirely.
4. While testing cooling tower water, a technician finds the pH level at 8.5. What is the most
appropriate corrective action?
A) Add acid to lower the pH into the optimal range.
B) Add caustic soda to raise the pH further.
C) Take no action since 8.5 is acceptable.
D) Shut down the tower immediately and drain the system.
Correct Answer: A) Add acid to lower the pH into the optimal range.
Rationale: Cooling tower water should typically maintain pH between 6.5 and 8.0. A reading of 8.5
indicates alkalinity that promotes scale formation on heat exchange surfaces. Acid addition lowers
pH. Caustic soda raises pH, worsening the condition. Immediate shutdown is unnecessary as 8.5 is not
an emergency.
5. A plumbing inspection reveals a P-trap beneath a sink. What is the primary purpose of this
component?
A) To provide a cleanout access point for blockages.
B) To regulate the flow rate of wastewater.
C) To create a water seal that blocks sewer gas entry.
D) To allow manual shutoff of the water supply.
Correct Answer: C) To create a water seal that blocks sewer gas entry.
Rationale: The P-trap retains a small volume of water that forms a barrier against sewer gases
entering the building. Cleanouts are separate fittings. Flow regulation is not a trap function. Shutoff
valves are located on supply lines. The water seal is the essential sanitary function.
6. A gas water heater exhibits rust accumulation at its base. What does this condition most likely
indicate?
A) The water heater has reached the end of its service life and must be replaced.
B) The anode rod needs replacement but the tank is sound.
C) The pilot light needs adjustment.
D) The water heater will soon lose its structural integrity.
Correct Answer: A) The water heater has reached the end of its service life and must be replaced.
,Rationale: Rust at the base of a gas water heater typically signals internal tank corrosion and
leakage. This is a structural failure rather than a cosmetic issue. Water leaking near the burner can
extinguish the pilot, creating a gas hazard. Replacement is the safe and appropriate action.
7. What is the correct method for checking and adjusting tension on a V-belt drive system?
A) Apply maximum tension to prevent any slippage.
B) Visually inspect the belt and tighten until snug.
C) Use a belt tension gauge and follow manufacturer specifications.
D) Tighten the belt until it has no measurable deflection.
Correct Answer: C) Use a belt tension gauge and follow manufacturer specifications.
Rationale: Proper belt tension ensures efficient power transmission and bearing longevity. A
calibrated tension gauge or frequency meter provides accurate measurement. Maximum tension
accelerates bearing wear. Visual inspection alone is imprecise. Zero deflection is excessive and
damages components.
8. A single-phase motor hums but fails to start. Which condition is the most likely cause?
A) An open winding in the motor.
B) A locked rotor or mechanical binding.
C) Excessively high line voltage.
D) A properly functioning start capacitor.
Correct Answer: B) A locked rotor or mechanical binding.
Rationale: A humming motor that does not rotate indicates the rotor is unable to turn despite current
flowing. Mechanical binding or a locked rotor causes high starting current and overheating. An open
winding would prevent any current flow. High voltage is uncommon. A functional capacitor would
assist starting.
9. When using a fire extinguisher on a small electrical fire, what is the correct sequence according
to the PASS method?
A) Pull, Aim, Squeeze, Sweep.
B) Push, Alert, Spray, Stop.
C) Point, Assess, Secure, Spray.
D) Prepare, Activate, Suppress, Survey.
Correct Answer: A) Pull, Aim, Squeeze, Sweep.
Rationale: The PASS technique is the standard method for fire extinguisher operation. Pull the pin,
Aim at the base of the fire, Squeeze the handle, and Sweep side to side. This sequence ensures
effective application. The other options are fabricated mnemonics without industry recognition.
10. A thermal imaging scan reveals a warm circuit breaker under normal load. What is the most
appropriate maintenance response?
, A) Replace the breaker with a higher amperage unit.
B) Tighten connections and schedule a thermal inspection.
C) Ignore the condition if the breaker is not tripping.
D) Shut down the entire panel and call an electrician immediately.
Correct Answer: B) Tighten connections and schedule a thermal inspection.
Rationale: Warm breakers often indicate high-resistance connections from loose terminations.
Tightening connections addresses the immediate cause. Thermal imaging identifies other potential
hot spots. Installing oversized breakers violates code. Ignoring the condition risks fire. Immediate
shutdown is excessive unless imminent danger exists.
11. According to OSHA lockout/tagout procedures, who must be notified before equipment is shut
down for servicing?
A) Only the maintenance supervisor.
B) Affected employees who operate the equipment.
C) The local electrical utility.
D) No notification is required if the shutdown is brief.
Correct Answer: B) Affected employees who operate the equipment.
Rationale: Affected employees must be notified before shutdown so they understand the equipment
is being serviced and do not attempt to restart it. This prevents accidental energization. Supervisor
notification is separate. Utility notification is unrelated. Even brief shutdowns require notification.
12. When measuring resistance with a multimeter, what must be done before connecting the test
leads?
A) Set the meter to measure AC voltage.
B) De-energize the circuit completely.
C) Connect the leads to the current jacks.
D) Increase the range to maximum.
Correct Answer: B) De-energize the circuit completely.
Rationale: Resistance measurements require a de-energized circuit because the ohmmeter uses its
internal battery to measure resistance. Applying external voltage damages the meter and creates
shock hazards. AC voltage settings measure voltage, not resistance. Current jacks are for current
measurement. Maximum range does not address the safety requirement.
13. Which location in a dwelling unit is NOT typically required to have GFCI protection?
A) Bathroom receptacles.
B) Garage receptacles.
C) Bedroom receptacles.
QUESTIONS AND VERIFIED ANSWERS | 2026–2027 LATEST
UPDATE | GUARANTEED PASS | DETAILED RATIONALES |
FULL STUDY GUIDE | EXAM PREP | PRACTICE TEST |
CERTIFICATION PREPARATION
SECTION ONE: QUESTIONS 1–100
1. A technician is preparing to service a conveyor motor that has jammed mid-shift. According to
OSHA's Control of Hazardous Energy standard, what must occur before any maintenance work
begins?
A) The technician should notify the supervisor and begin work immediately.
B) The energy source must be isolated, locked out, and tagged.
C) The conveyor should be restarted to verify the jam.
D) A work order must be submitted to the maintenance department.
Correct Answer: B) The energy source must be isolated, locked out, and tagged.
Rationale: OSHA 29 CFR 1910.147 requires that hazardous energy be isolated and controlled before
servicing. Lockout/tagout prevents unexpected energization or release of stored energy. Notification
is important but is not the primary protective step. Restarting a jammed conveyor risks injury. Work
orders are administrative, not safety controls.
2. During routine inspection of a commercial HVAC unit, a technician discovers the compressor is
drawing higher-than-normal amperage while running. Which condition is most likely responsible?
A) The refrigerant charge is slightly low.
B) The condenser coil is clean and free-flowing.
C) The compressor is experiencing mechanical binding or bearing wear.
D) The thermostat is set to a lower temperature than usual.
Correct Answer: C) The compressor is experiencing mechanical binding or bearing wear.
Rationale: Increased amperage draw typically indicates the compressor is working harder due to
mechanical resistance. Bearing wear or internal binding forces the motor to draw more current. Low
refrigerant charge reduces load, not increases it. A clean condenser improves efficiency. Thermostat
settings affect runtime, not amperage draw.
3. A maintenance technician notices a slight vibration and humming noise from a recently installed
three-phase motor. Which factor should be investigated first?
A) The start capacitor may have failed.
B) The motor may be misaligned with the driven load.
,C) The refrigerant charge may be low.
D) The bearing may be completely seized.
Correct Answer: B) The motor may be misaligned with the driven load.
Rationale: Vibration and humming in three-phase motors commonly result from misalignment or
voltage imbalance. Misalignment causes uneven loading and vibration. A failed start capacitor
affects single-phase motors. Refrigerant charge is unrelated to motor vibration. A seized bearing
would prevent rotation entirely.
4. While testing cooling tower water, a technician finds the pH level at 8.5. What is the most
appropriate corrective action?
A) Add acid to lower the pH into the optimal range.
B) Add caustic soda to raise the pH further.
C) Take no action since 8.5 is acceptable.
D) Shut down the tower immediately and drain the system.
Correct Answer: A) Add acid to lower the pH into the optimal range.
Rationale: Cooling tower water should typically maintain pH between 6.5 and 8.0. A reading of 8.5
indicates alkalinity that promotes scale formation on heat exchange surfaces. Acid addition lowers
pH. Caustic soda raises pH, worsening the condition. Immediate shutdown is unnecessary as 8.5 is not
an emergency.
5. A plumbing inspection reveals a P-trap beneath a sink. What is the primary purpose of this
component?
A) To provide a cleanout access point for blockages.
B) To regulate the flow rate of wastewater.
C) To create a water seal that blocks sewer gas entry.
D) To allow manual shutoff of the water supply.
Correct Answer: C) To create a water seal that blocks sewer gas entry.
Rationale: The P-trap retains a small volume of water that forms a barrier against sewer gases
entering the building. Cleanouts are separate fittings. Flow regulation is not a trap function. Shutoff
valves are located on supply lines. The water seal is the essential sanitary function.
6. A gas water heater exhibits rust accumulation at its base. What does this condition most likely
indicate?
A) The water heater has reached the end of its service life and must be replaced.
B) The anode rod needs replacement but the tank is sound.
C) The pilot light needs adjustment.
D) The water heater will soon lose its structural integrity.
Correct Answer: A) The water heater has reached the end of its service life and must be replaced.
,Rationale: Rust at the base of a gas water heater typically signals internal tank corrosion and
leakage. This is a structural failure rather than a cosmetic issue. Water leaking near the burner can
extinguish the pilot, creating a gas hazard. Replacement is the safe and appropriate action.
7. What is the correct method for checking and adjusting tension on a V-belt drive system?
A) Apply maximum tension to prevent any slippage.
B) Visually inspect the belt and tighten until snug.
C) Use a belt tension gauge and follow manufacturer specifications.
D) Tighten the belt until it has no measurable deflection.
Correct Answer: C) Use a belt tension gauge and follow manufacturer specifications.
Rationale: Proper belt tension ensures efficient power transmission and bearing longevity. A
calibrated tension gauge or frequency meter provides accurate measurement. Maximum tension
accelerates bearing wear. Visual inspection alone is imprecise. Zero deflection is excessive and
damages components.
8. A single-phase motor hums but fails to start. Which condition is the most likely cause?
A) An open winding in the motor.
B) A locked rotor or mechanical binding.
C) Excessively high line voltage.
D) A properly functioning start capacitor.
Correct Answer: B) A locked rotor or mechanical binding.
Rationale: A humming motor that does not rotate indicates the rotor is unable to turn despite current
flowing. Mechanical binding or a locked rotor causes high starting current and overheating. An open
winding would prevent any current flow. High voltage is uncommon. A functional capacitor would
assist starting.
9. When using a fire extinguisher on a small electrical fire, what is the correct sequence according
to the PASS method?
A) Pull, Aim, Squeeze, Sweep.
B) Push, Alert, Spray, Stop.
C) Point, Assess, Secure, Spray.
D) Prepare, Activate, Suppress, Survey.
Correct Answer: A) Pull, Aim, Squeeze, Sweep.
Rationale: The PASS technique is the standard method for fire extinguisher operation. Pull the pin,
Aim at the base of the fire, Squeeze the handle, and Sweep side to side. This sequence ensures
effective application. The other options are fabricated mnemonics without industry recognition.
10. A thermal imaging scan reveals a warm circuit breaker under normal load. What is the most
appropriate maintenance response?
, A) Replace the breaker with a higher amperage unit.
B) Tighten connections and schedule a thermal inspection.
C) Ignore the condition if the breaker is not tripping.
D) Shut down the entire panel and call an electrician immediately.
Correct Answer: B) Tighten connections and schedule a thermal inspection.
Rationale: Warm breakers often indicate high-resistance connections from loose terminations.
Tightening connections addresses the immediate cause. Thermal imaging identifies other potential
hot spots. Installing oversized breakers violates code. Ignoring the condition risks fire. Immediate
shutdown is excessive unless imminent danger exists.
11. According to OSHA lockout/tagout procedures, who must be notified before equipment is shut
down for servicing?
A) Only the maintenance supervisor.
B) Affected employees who operate the equipment.
C) The local electrical utility.
D) No notification is required if the shutdown is brief.
Correct Answer: B) Affected employees who operate the equipment.
Rationale: Affected employees must be notified before shutdown so they understand the equipment
is being serviced and do not attempt to restart it. This prevents accidental energization. Supervisor
notification is separate. Utility notification is unrelated. Even brief shutdowns require notification.
12. When measuring resistance with a multimeter, what must be done before connecting the test
leads?
A) Set the meter to measure AC voltage.
B) De-energize the circuit completely.
C) Connect the leads to the current jacks.
D) Increase the range to maximum.
Correct Answer: B) De-energize the circuit completely.
Rationale: Resistance measurements require a de-energized circuit because the ohmmeter uses its
internal battery to measure resistance. Applying external voltage damages the meter and creates
shock hazards. AC voltage settings measure voltage, not resistance. Current jacks are for current
measurement. Maximum range does not address the safety requirement.
13. Which location in a dwelling unit is NOT typically required to have GFCI protection?
A) Bathroom receptacles.
B) Garage receptacles.
C) Bedroom receptacles.
