NEIEP 400 Final Practice Test 2026 | Verified Answers |
Exam Prep
1. The material used for commutator brushes is mostly
Mica
Cast iron
Copper
Carbon
2. If unexpected readings are detected, what should you do?
Consider the possibility of instrument failure.
Contact the manufacturer of the monitoring device.
Immediately evacuate all personnel.
Ignore the results.
3. If a motor equipped with a field protective relay experiences a sudden
increase in current, what action will the relay likely take?
It will send an alert to the operator.
It will disconnect the motor to prevent damage.
It will increase the motor's power output.
It will continue to operate normally.
4. When it comes to motor and blower, lubricate the motor bearings at least
every ____ months with a few drops of good S.A.E. 20 motor oil.
Six
Three
, Two
Eight
5. Why is it important to disconnect the power supply before measuring
resistance?
To increase the resistance of the circuit.
To allow the circuit to function normally during measurement.
To prevent damage to the multimeter and ensure accurate readings.
To ensure the resistor is not overloaded.
6. What problem can occur if proper lubrication of a motor is not done on a
recommended time interval?
Bearings will burn with thick fumes
Bearings will burst with explosion
All of the above
Bearings will cease to move
7. What does the meter specification of ohms per volt indicate?
It indicates the voltage rating of the meter.
It indicates the current rating of the meter.
It indicates the resistance of the meter.
It indicates the input impedance of the meter.
8. If a 3 phase, 60 Hz motor has 4 poles, what is its synchronous speed?
3600 RPM
, 1800 RPM
1200 RPM
2400 RPM
9. What are the primary components that constitute a commutator film in
electrical systems?
Copper and graphite
Aluminum and rubber
Steel and plastic
Iron and silicon
10. If a motor is experiencing excessive sparking at the brushes, what role would
adjusting the interpoles play in resolving this issue?
Adjusting the interpoles would decrease the motor's efficiency.
Adjusting the interpoles would increase the motor's speed.
Adjusting the interpoles would help improve commutation and
reduce sparking.
Adjusting the interpoles would have no effect on sparking.
11. In a scenario where a motor shows signs of electrical leakage, which
procedure should be followed to ensure safety before conducting repairs?
Use an insulation resistance tester to check for leakage resistance.
Only check the motor's voltage supply.
Disconnect the motor and assume it is safe.
Immediately replace the motor without testing.
Exam Prep
1. The material used for commutator brushes is mostly
Mica
Cast iron
Copper
Carbon
2. If unexpected readings are detected, what should you do?
Consider the possibility of instrument failure.
Contact the manufacturer of the monitoring device.
Immediately evacuate all personnel.
Ignore the results.
3. If a motor equipped with a field protective relay experiences a sudden
increase in current, what action will the relay likely take?
It will send an alert to the operator.
It will disconnect the motor to prevent damage.
It will increase the motor's power output.
It will continue to operate normally.
4. When it comes to motor and blower, lubricate the motor bearings at least
every ____ months with a few drops of good S.A.E. 20 motor oil.
Six
Three
, Two
Eight
5. Why is it important to disconnect the power supply before measuring
resistance?
To increase the resistance of the circuit.
To allow the circuit to function normally during measurement.
To prevent damage to the multimeter and ensure accurate readings.
To ensure the resistor is not overloaded.
6. What problem can occur if proper lubrication of a motor is not done on a
recommended time interval?
Bearings will burn with thick fumes
Bearings will burst with explosion
All of the above
Bearings will cease to move
7. What does the meter specification of ohms per volt indicate?
It indicates the voltage rating of the meter.
It indicates the current rating of the meter.
It indicates the resistance of the meter.
It indicates the input impedance of the meter.
8. If a 3 phase, 60 Hz motor has 4 poles, what is its synchronous speed?
3600 RPM
, 1800 RPM
1200 RPM
2400 RPM
9. What are the primary components that constitute a commutator film in
electrical systems?
Copper and graphite
Aluminum and rubber
Steel and plastic
Iron and silicon
10. If a motor is experiencing excessive sparking at the brushes, what role would
adjusting the interpoles play in resolving this issue?
Adjusting the interpoles would decrease the motor's efficiency.
Adjusting the interpoles would increase the motor's speed.
Adjusting the interpoles would help improve commutation and
reduce sparking.
Adjusting the interpoles would have no effect on sparking.
11. In a scenario where a motor shows signs of electrical leakage, which
procedure should be followed to ensure safety before conducting repairs?
Use an insulation resistance tester to check for leakage resistance.
Only check the motor's voltage supply.
Disconnect the motor and assume it is safe.
Immediately replace the motor without testing.
