1|Page
NCCER ELECTRICAL EXAM PREP 2026
ALL QUESTIONS AND CORRECT
DETAILED ANSWERS ALREADY A
GRADED WITH EXPERT FEEDBACK
|NEW AND REVISED
A transformer with the primary of 400 turns and a secondary of 300
turns has a _____ - ANSWER- Step-down turns ratio of 4:3
The circular mil is based on the - ANSWER- Cross-sectional area of the
wire
Of the termination classes listed below, ____ is the only one that
provides a seal against external elements. - ANSWER- Class 1
Unless otherwise noted. the calculations in AC circuits _____ values. -
ANSWER- Rms
When the coil turns are increased the _____ - ANSWER- Induced
voltage is increased
As the temperature surrounding a self-regulating heating cable rises, the
____ - ANSWER- Resistance of the polymeric core increases
,2|Page
The motor type that has the highest starting torque is the ____ motor. -
ANSWER- Capacitor-start
For a given number of poles, the ____ determines the speed of an AC
motor. - ANSWER- Frequency
Both induction and synchronous motors operate on the principle of a
rotating ____ field - ANSWER- Magnetic
A transformer has 200 turns in the primary, 150 turns in the secondary,
and 120VAC applied to the primary. The voltage across the secondary
is: - ANSWER- 90Volts
The output capacity of a motor is rated in - ANSWER- Horsepower
The synchronous speed at which a pole, 60 Hz induction motor operates
is rpm. - ANSWER- 1,800
The sine of 0 degree is - ANSWER- 0
Meters used in AC circuits indicate the - ANSWER- Effective
The component labeled 7 in figure 1 is a(n) - ANSWER- End seal
,3|Page
In an AC circuit containing resistance only _____ will flow if the
resistance is 10 ohms and the voltage is 120V. - ANSWER- 12A
The _____ rotor types are generally rugged. - ANSWER- Squirrel cage
Proofs tests are made at_ of the original factory voltage. - ANSWER-
60%
Which type of heating cable cannot be cut and terminated in the field? -
ANSWER- Mineral insulated
The secondary of a CT under load should not be opened because of_. -
ANSWER- Induced high voltage
In a transformer ______ - ANSWER- Electromagnetic Induction Ocurs
When a ground rod is installed, the top of the rod must be positioned
______ grade. - ANSWER- Flush with or below
When making offset bends, the two kicks must be made perfectly
parallel or the resulting offset will have a _____ - ANSWER- Crooked
Bend
conduit that requires a 90 degree change in direction, except 42.All of
the following types of condulet may be used as a pulling point for _____
- ANSWER- C
, 4|Page
To be effective, a grounding system must limit the voltage on the
electrical system and protect it from all of the following, except _____ -
ANSWER- Undervoltage conditions
What is the MOST common service used in a temporary power panel? -
ANSWER- 120/240 volt, 1-phase, 3-wire
What are the 2 MOST common types of overcurrent protective devices?
- ANSWER- Circuit breakers and fuses
What instrument is used to perform an insulation-resistance test on a
480- volt motor winding? - ANSWER- Megohmmeter
Why is a seal installed in a run of conduit in a Class I location? -
ANSWER- Prevent the passage of explosive gases in the conduit
Which of the following is the correct formula for OHM's law? -
ANSWER- I=E/R
Which of the following testing instruments operated on the current
transformer principle? - ANSWER- Clamp-on ammeter
A 120/208 volt feeder consists of an 800 ft run of 500 kcmil aluminum
wire in conduit. This feeder has 5% voltage drop. What will the phase-
to-phase voltage be at the load end? - ANSWER- 197.60 volts
NCCER ELECTRICAL EXAM PREP 2026
ALL QUESTIONS AND CORRECT
DETAILED ANSWERS ALREADY A
GRADED WITH EXPERT FEEDBACK
|NEW AND REVISED
A transformer with the primary of 400 turns and a secondary of 300
turns has a _____ - ANSWER- Step-down turns ratio of 4:3
The circular mil is based on the - ANSWER- Cross-sectional area of the
wire
Of the termination classes listed below, ____ is the only one that
provides a seal against external elements. - ANSWER- Class 1
Unless otherwise noted. the calculations in AC circuits _____ values. -
ANSWER- Rms
When the coil turns are increased the _____ - ANSWER- Induced
voltage is increased
As the temperature surrounding a self-regulating heating cable rises, the
____ - ANSWER- Resistance of the polymeric core increases
,2|Page
The motor type that has the highest starting torque is the ____ motor. -
ANSWER- Capacitor-start
For a given number of poles, the ____ determines the speed of an AC
motor. - ANSWER- Frequency
Both induction and synchronous motors operate on the principle of a
rotating ____ field - ANSWER- Magnetic
A transformer has 200 turns in the primary, 150 turns in the secondary,
and 120VAC applied to the primary. The voltage across the secondary
is: - ANSWER- 90Volts
The output capacity of a motor is rated in - ANSWER- Horsepower
The synchronous speed at which a pole, 60 Hz induction motor operates
is rpm. - ANSWER- 1,800
The sine of 0 degree is - ANSWER- 0
Meters used in AC circuits indicate the - ANSWER- Effective
The component labeled 7 in figure 1 is a(n) - ANSWER- End seal
,3|Page
In an AC circuit containing resistance only _____ will flow if the
resistance is 10 ohms and the voltage is 120V. - ANSWER- 12A
The _____ rotor types are generally rugged. - ANSWER- Squirrel cage
Proofs tests are made at_ of the original factory voltage. - ANSWER-
60%
Which type of heating cable cannot be cut and terminated in the field? -
ANSWER- Mineral insulated
The secondary of a CT under load should not be opened because of_. -
ANSWER- Induced high voltage
In a transformer ______ - ANSWER- Electromagnetic Induction Ocurs
When a ground rod is installed, the top of the rod must be positioned
______ grade. - ANSWER- Flush with or below
When making offset bends, the two kicks must be made perfectly
parallel or the resulting offset will have a _____ - ANSWER- Crooked
Bend
conduit that requires a 90 degree change in direction, except 42.All of
the following types of condulet may be used as a pulling point for _____
- ANSWER- C
, 4|Page
To be effective, a grounding system must limit the voltage on the
electrical system and protect it from all of the following, except _____ -
ANSWER- Undervoltage conditions
What is the MOST common service used in a temporary power panel? -
ANSWER- 120/240 volt, 1-phase, 3-wire
What are the 2 MOST common types of overcurrent protective devices?
- ANSWER- Circuit breakers and fuses
What instrument is used to perform an insulation-resistance test on a
480- volt motor winding? - ANSWER- Megohmmeter
Why is a seal installed in a run of conduit in a Class I location? -
ANSWER- Prevent the passage of explosive gases in the conduit
Which of the following is the correct formula for OHM's law? -
ANSWER- I=E/R
Which of the following testing instruments operated on the current
transformer principle? - ANSWER- Clamp-on ammeter
A 120/208 volt feeder consists of an 800 ft run of 500 kcmil aluminum
wire in conduit. This feeder has 5% voltage drop. What will the phase-
to-phase voltage be at the load end? - ANSWER- 197.60 volts
