NEIEP 400 Final Review Latest Update 2026 | Exam Prep |
High-Yield Review Guide
1. What does the meter specification of ohms per volt indicate?
It indicates the input impedance of the meter.
It indicates the current rating of the meter.
It indicates the frequency response of the meter.
It indicates the voltage rating of the meter.
2. What is the recommended resistance of a motor or generator commutator to
ground when the brushes are raised?
Infinity
100 ohms
1 megaohm
Zero
3. Which statement describes synchronous speed?
the rotational speed of the field windings magnetic field on a
conduction motor
the rotational speed of the stator's magnetic field on an induction
motor
the rotational speed of the armature on a conduction motor
the rotational speed of the rotor on an induction motor
4. What is the standard unit of resistance used to express 2230Ω?
Watts
, Ohms
Amperes
Volts
5. Describe the role of the brake in an elevator system and what might happen
if it fails.
The brake generates power for the elevator; if it fails, the elevator will
stop working.
The brake holds the elevator in place; if it fails, the elevator may
move unexpectedly.
The brake controls the speed of the elevator; if it fails, the elevator will
descend too quickly.
The brake is used for maintenance; if it fails, the elevator will require
immediate servicing.
6. Synchronous speed in an AC Machine is most nearly defined as:
The speed at which the machine generates power
The speed at which the torque is maximum
The rotational speed of the motor
The rotational speed of the magnetic field
7. If a technician observes threading on the commutator of a DC motor during
maintenance, what steps should they take to address the issue?
Lubricate the commutator to reduce friction.
Inspect and replace the commutator if necessary.
Ignore the threading as it does not affect performance.
, Increase the voltage supplied to the motor.
8. If you are testing a DC motor and the voltage readings are consistently lower
than expected, what troubleshooting step should you take first?
Disconnect the power supply.
Increase the load on the motor.
Check the meter's calibration.
Replace the motor with a new one.
9. Describe how poor maintenance can lead to commutator problems in
motors.
Poor maintenance can cause wear and tear on the commutator,
leading to poor electrical contact and increased sparking.
Poor maintenance only affects the motor's efficiency, not the
commutator.
Poor maintenance has no effect on the commutator's performance.
Poor maintenance results in better lubrication, which prevents
commutator issues.
10. The substance between commutator bars is:
polyethylene
dielectric
copper plates
wax paper
mica
, 11. Which of the following is the most common cause of commutator problems?
current overload
improper brush seating
mica set too high between segments
brush pressure too light
12. What is the effect on a current-carrying wire placed in a magnetic field?
It heats up.
It becomes magnetized.
It experiences a force.
It stops conducting electricity.
13. Describe the significance of a resistance measurement of .250 MΩ in the
context of electrical systems.
A resistance of .250 MΩ indicates a relatively high resistance, which
can affect current flow in a circuit.
A resistance of .250 MΩ indicates a short circuit condition.
A resistance of .250 MΩ suggests a low impedance path for current.
A resistance of .250 MΩ is irrelevant in electrical measurements.
14. Changing the ___ applied to a DC motor changes the speed of the motor.
inductance
voltage
current
resistance
High-Yield Review Guide
1. What does the meter specification of ohms per volt indicate?
It indicates the input impedance of the meter.
It indicates the current rating of the meter.
It indicates the frequency response of the meter.
It indicates the voltage rating of the meter.
2. What is the recommended resistance of a motor or generator commutator to
ground when the brushes are raised?
Infinity
100 ohms
1 megaohm
Zero
3. Which statement describes synchronous speed?
the rotational speed of the field windings magnetic field on a
conduction motor
the rotational speed of the stator's magnetic field on an induction
motor
the rotational speed of the armature on a conduction motor
the rotational speed of the rotor on an induction motor
4. What is the standard unit of resistance used to express 2230Ω?
Watts
, Ohms
Amperes
Volts
5. Describe the role of the brake in an elevator system and what might happen
if it fails.
The brake generates power for the elevator; if it fails, the elevator will
stop working.
The brake holds the elevator in place; if it fails, the elevator may
move unexpectedly.
The brake controls the speed of the elevator; if it fails, the elevator will
descend too quickly.
The brake is used for maintenance; if it fails, the elevator will require
immediate servicing.
6. Synchronous speed in an AC Machine is most nearly defined as:
The speed at which the machine generates power
The speed at which the torque is maximum
The rotational speed of the motor
The rotational speed of the magnetic field
7. If a technician observes threading on the commutator of a DC motor during
maintenance, what steps should they take to address the issue?
Lubricate the commutator to reduce friction.
Inspect and replace the commutator if necessary.
Ignore the threading as it does not affect performance.
, Increase the voltage supplied to the motor.
8. If you are testing a DC motor and the voltage readings are consistently lower
than expected, what troubleshooting step should you take first?
Disconnect the power supply.
Increase the load on the motor.
Check the meter's calibration.
Replace the motor with a new one.
9. Describe how poor maintenance can lead to commutator problems in
motors.
Poor maintenance can cause wear and tear on the commutator,
leading to poor electrical contact and increased sparking.
Poor maintenance only affects the motor's efficiency, not the
commutator.
Poor maintenance has no effect on the commutator's performance.
Poor maintenance results in better lubrication, which prevents
commutator issues.
10. The substance between commutator bars is:
polyethylene
dielectric
copper plates
wax paper
mica
, 11. Which of the following is the most common cause of commutator problems?
current overload
improper brush seating
mica set too high between segments
brush pressure too light
12. What is the effect on a current-carrying wire placed in a magnetic field?
It heats up.
It becomes magnetized.
It experiences a force.
It stops conducting electricity.
13. Describe the significance of a resistance measurement of .250 MΩ in the
context of electrical systems.
A resistance of .250 MΩ indicates a relatively high resistance, which
can affect current flow in a circuit.
A resistance of .250 MΩ indicates a short circuit condition.
A resistance of .250 MΩ suggests a low impedance path for current.
A resistance of .250 MΩ is irrelevant in electrical measurements.
14. Changing the ___ applied to a DC motor changes the speed of the motor.
inductance
voltage
current
resistance
