OHIO MAINTENANCE TECHNICIAN
EXAM – PRACTICE QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026
Q&A | INSTANT DOWNLOAD.
1. What is the primary function of preventive maintenance?
A. Repair equipment after failure
B. Reduce the likelihood of equipment breakdown
C. Increase equipment speed
D. Lower employee wages
Preventive maintenance is designed to maintain equipment before failures
occur, ensuring reliability and longevity.
2. Which of the following tools is used to measure electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Megger
An ammeter measures the flow of electrical current in amperes.
3. A bearing that reduces friction between rotating parts is called a:
A. Lock washer
B. Thread insert
C. Roller bearing
D. Rivet
Roller bearings use rolling elements to reduce friction and support rotating
parts.
4. Which device is used to protect an electric circuit from overcurrent?
A. Switch
, B. Relay
C. Fuse
D. Transformer
A fuse breaks the circuit when current exceeds a safe level, preventing
damage.
5. The unit of electrical resistance is:
A. Volt
B. Ohm
C. Ampere
D. Watt
Resistance is measured in ohms (Ω), as per Ohm’s Law.
6. What type of maintenance is performed after equipment has failed?
A. Preventive
B. Predictive
C. Corrective
D. Scheduled
Corrective maintenance restores equipment after a failure occurs.
7. Which instrument measures voltage?
A. Ammeter
B. Voltmeter
C. Caliper
D. Clamp meter
A voltmeter is used to measure electrical potential difference (voltage).
8. What color wire is typically used for ground in electrical systems?
A. Red
B. Blue
C. Green
D. White
Green wires are universally used for grounding in electrical systems.
9. A GFCI outlet protects against:
A. High voltage
B. Power surges
C. Electrical shock from ground faults
, D. Short circuits
Ground Fault Circuit Interrupters detect imbalances between hot and
neutral currents to prevent electric shocks.
10.What is the first step in troubleshooting an electrical circuit?
A. Replace components
B. Check all fuses
C. Verify power source and connections
D. Remove wires
Always confirm that the circuit has proper power and connections before
deeper testing.
11.Which tool is best for measuring inside diameters?
A. Micrometer
B. Inside caliper
C. Vernier scale
D. Straightedge
Inside calipers measure the inner diameter of holes or cylinders.
12.The formula for Ohm’s Law is:
A. P = I × R
B. V = I × R
C. R = P / I
D. I = P × V
Ohm’s Law defines the relationship between voltage (V), current (I), and
resistance (R).
13.Which device converts AC to DC?
A. Transformer
B. Resistor
C. Rectifier
D. Capacitor
A rectifier converts alternating current (AC) to direct current (DC).
14.The main purpose of lubrication in machinery is to:
A. Cool the motor
EXAM – PRACTICE QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026
Q&A | INSTANT DOWNLOAD.
1. What is the primary function of preventive maintenance?
A. Repair equipment after failure
B. Reduce the likelihood of equipment breakdown
C. Increase equipment speed
D. Lower employee wages
Preventive maintenance is designed to maintain equipment before failures
occur, ensuring reliability and longevity.
2. Which of the following tools is used to measure electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Megger
An ammeter measures the flow of electrical current in amperes.
3. A bearing that reduces friction between rotating parts is called a:
A. Lock washer
B. Thread insert
C. Roller bearing
D. Rivet
Roller bearings use rolling elements to reduce friction and support rotating
parts.
4. Which device is used to protect an electric circuit from overcurrent?
A. Switch
, B. Relay
C. Fuse
D. Transformer
A fuse breaks the circuit when current exceeds a safe level, preventing
damage.
5. The unit of electrical resistance is:
A. Volt
B. Ohm
C. Ampere
D. Watt
Resistance is measured in ohms (Ω), as per Ohm’s Law.
6. What type of maintenance is performed after equipment has failed?
A. Preventive
B. Predictive
C. Corrective
D. Scheduled
Corrective maintenance restores equipment after a failure occurs.
7. Which instrument measures voltage?
A. Ammeter
B. Voltmeter
C. Caliper
D. Clamp meter
A voltmeter is used to measure electrical potential difference (voltage).
8. What color wire is typically used for ground in electrical systems?
A. Red
B. Blue
C. Green
D. White
Green wires are universally used for grounding in electrical systems.
9. A GFCI outlet protects against:
A. High voltage
B. Power surges
C. Electrical shock from ground faults
, D. Short circuits
Ground Fault Circuit Interrupters detect imbalances between hot and
neutral currents to prevent electric shocks.
10.What is the first step in troubleshooting an electrical circuit?
A. Replace components
B. Check all fuses
C. Verify power source and connections
D. Remove wires
Always confirm that the circuit has proper power and connections before
deeper testing.
11.Which tool is best for measuring inside diameters?
A. Micrometer
B. Inside caliper
C. Vernier scale
D. Straightedge
Inside calipers measure the inner diameter of holes or cylinders.
12.The formula for Ohm’s Law is:
A. P = I × R
B. V = I × R
C. R = P / I
D. I = P × V
Ohm’s Law defines the relationship between voltage (V), current (I), and
resistance (R).
13.Which device converts AC to DC?
A. Transformer
B. Resistor
C. Rectifier
D. Capacitor
A rectifier converts alternating current (AC) to direct current (DC).
14.The main purpose of lubrication in machinery is to:
A. Cool the motor
