BCTC Industrial Maintenance
Technology AMTEC (NOCTI
Mechatronic) Review| questions|
with complete solutions
Course
NOCTI
Original practice questions modeled on common industrial maintenance/mechatronics
competency areas.
1. What is the primary purpose of preventive maintenance?
A. Repair equipment only after failure
B. Reduce the likelihood of equipment failure through scheduled maintenance
C. Increase machine operating speed
D. Eliminate the need for inspections
Correct Answer: B. Reduce the likelihood of equipment failure through scheduled
maintenance
Solution: Preventive maintenance involves planned inspections, lubrication, adjustments, and
component replacement performed at predetermined intervals. Its purpose is to identify and
correct developing problems before they cause major equipment failure.
,2. Which instrument is commonly used to measure electrical resistance?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Frequency meter
Correct Answer: C. Ohmmeter
Solution: An ohmmeter measures resistance in ohms. Resistance testing should normally be
performed with the circuit de-energized to prevent damage to the meter and provide a valid
reading.
3. According to Ohm's law, voltage is equal to:
A. Current ÷ resistance
B. Current × resistance
C. Resistance ÷ current
D. Current + resistance
Correct Answer: B. Current × resistance
Solution: Ohm's law is V = I × R, where V is voltage, I is current, and R is resistance.
4. A 24 V circuit has a resistance of 12 Ω. What current flows through the circuit?
A. 0.5 A
B. 2 A
C. 12 A
D. 36 A
,Correct Answer: B. 2 A
Solution: Using I = V/R:
24 V ÷ 12 Ω = 2 A
5. What is the main function of a fuse?
A. Increase voltage
B. Store electrical energy
C. Protect a circuit from excessive current
D. Convert AC to DC
Correct Answer: C. Protect a circuit from excessive current
Solution: A fuse contains a conductive element designed to melt when excessive current flows,
opening the circuit and protecting wiring and equipment.
6. What is the purpose of a relay in an industrial control circuit?
A. Mechanically support a motor
B. Use one electrical signal to control another circuit
C. Measure pressure
D. Store compressed air
Correct Answer: B. Use one electrical signal to control another circuit
Solution: A relay is an electrically operated switching device. A relatively small control current
can operate contacts that switch another circuit.
7. Which component converts electrical energy into mechanical rotational energy?
, A. Transformer
B. Electric motor
C. Resistor
D. Capacitor
Correct Answer: B. Electric motor
Solution: An electric motor converts electrical energy into mechanical energy, producing torque
and rotation.
8. What is the purpose of a motor overload relay?
A. Protect against excessive motor current over time
B. Increase motor speed
C. Reverse motor rotation automatically
D. Convert AC into DC
Correct Answer: A. Protect against excessive motor current over time
Solution: An overload relay protects a motor from sustained overcurrent conditions that can
cause overheating and winding damage. It is different from a short-circuit protective device.
9. Which device is commonly used to detect the presence of a metal object without physical
contact?
A. Inductive proximity sensor
B. Thermocouple
C. Float switch
D. Pressure gauge
Technology AMTEC (NOCTI
Mechatronic) Review| questions|
with complete solutions
Course
NOCTI
Original practice questions modeled on common industrial maintenance/mechatronics
competency areas.
1. What is the primary purpose of preventive maintenance?
A. Repair equipment only after failure
B. Reduce the likelihood of equipment failure through scheduled maintenance
C. Increase machine operating speed
D. Eliminate the need for inspections
Correct Answer: B. Reduce the likelihood of equipment failure through scheduled
maintenance
Solution: Preventive maintenance involves planned inspections, lubrication, adjustments, and
component replacement performed at predetermined intervals. Its purpose is to identify and
correct developing problems before they cause major equipment failure.
,2. Which instrument is commonly used to measure electrical resistance?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Frequency meter
Correct Answer: C. Ohmmeter
Solution: An ohmmeter measures resistance in ohms. Resistance testing should normally be
performed with the circuit de-energized to prevent damage to the meter and provide a valid
reading.
3. According to Ohm's law, voltage is equal to:
A. Current ÷ resistance
B. Current × resistance
C. Resistance ÷ current
D. Current + resistance
Correct Answer: B. Current × resistance
Solution: Ohm's law is V = I × R, where V is voltage, I is current, and R is resistance.
4. A 24 V circuit has a resistance of 12 Ω. What current flows through the circuit?
A. 0.5 A
B. 2 A
C. 12 A
D. 36 A
,Correct Answer: B. 2 A
Solution: Using I = V/R:
24 V ÷ 12 Ω = 2 A
5. What is the main function of a fuse?
A. Increase voltage
B. Store electrical energy
C. Protect a circuit from excessive current
D. Convert AC to DC
Correct Answer: C. Protect a circuit from excessive current
Solution: A fuse contains a conductive element designed to melt when excessive current flows,
opening the circuit and protecting wiring and equipment.
6. What is the purpose of a relay in an industrial control circuit?
A. Mechanically support a motor
B. Use one electrical signal to control another circuit
C. Measure pressure
D. Store compressed air
Correct Answer: B. Use one electrical signal to control another circuit
Solution: A relay is an electrically operated switching device. A relatively small control current
can operate contacts that switch another circuit.
7. Which component converts electrical energy into mechanical rotational energy?
, A. Transformer
B. Electric motor
C. Resistor
D. Capacitor
Correct Answer: B. Electric motor
Solution: An electric motor converts electrical energy into mechanical energy, producing torque
and rotation.
8. What is the purpose of a motor overload relay?
A. Protect against excessive motor current over time
B. Increase motor speed
C. Reverse motor rotation automatically
D. Convert AC into DC
Correct Answer: A. Protect against excessive motor current over time
Solution: An overload relay protects a motor from sustained overcurrent conditions that can
cause overheating and winding damage. It is different from a short-circuit protective device.
9. Which device is commonly used to detect the presence of a metal object without physical
contact?
A. Inductive proximity sensor
B. Thermocouple
C. Float switch
D. Pressure gauge
