THE ELECTRICAL NCCER test questions with 100%
correct answers 2025
Which Article of the NEC covers grounding? - ANSWER article 250
Which of the following is a 90 degree, explosion proof fitting? - ANSWER GUAL
What is a dropout plate? - ANSWER Metal plate with a curved surface for cable to follow as it
passes from the tray
All of the following are common service voltages in the United States EXCEPT: - ANSWER
372/575 3-PHASE, 4-WIRE
What does a GFCI breaker do? - ANSWER Opens a circuit to prevent operation of an electrical
device
What will happen when one or more coils in a winding are grounded? - ANSWER The motor will
automatically blow fuses
Eight incandescent lighting fixtures are to be installed. Each fixture is 120- volts, with a 200-watt
lamp. What is the total connected load? - ANSWER 13.3 amps
The must be grounded in a bussed gutter if used as the main service equipment. - ANSWER
Neutral busbar
When wall mounting cable tray, ensure that - ANSWER The building structure is strong enough
to support the tray system
,The purpose of sealing cable ends when reels of cable are in storage is - ANSWER To keep
moisture from creeping in
The outer covering on liguid-tight flexible metal conduit is used for - ANSWER A moisture seal
A good electrical connection should - ANSWER Be mechanically and electrically secure
The symbol normally used for duplex - ANSWER Circle with two parallel lines drawb through it
Disconnecting means are covered in - ANSWER NEC Section 110-22
In relation to switches, the term throw refers to the - ANSWER Number of internal operations
that a switch can perform
A 3-phase, 4-wire, 480v service requires ______ current transformer(s) - ANSWER 3
Services conductors and equipment are covered in - ANSWER NEC Article 230
The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits be ______
receptacles - ANSWER Grounding
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
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
correct answers 2025
Which Article of the NEC covers grounding? - ANSWER article 250
Which of the following is a 90 degree, explosion proof fitting? - ANSWER GUAL
What is a dropout plate? - ANSWER Metal plate with a curved surface for cable to follow as it
passes from the tray
All of the following are common service voltages in the United States EXCEPT: - ANSWER
372/575 3-PHASE, 4-WIRE
What does a GFCI breaker do? - ANSWER Opens a circuit to prevent operation of an electrical
device
What will happen when one or more coils in a winding are grounded? - ANSWER The motor will
automatically blow fuses
Eight incandescent lighting fixtures are to be installed. Each fixture is 120- volts, with a 200-watt
lamp. What is the total connected load? - ANSWER 13.3 amps
The must be grounded in a bussed gutter if used as the main service equipment. - ANSWER
Neutral busbar
When wall mounting cable tray, ensure that - ANSWER The building structure is strong enough
to support the tray system
,The purpose of sealing cable ends when reels of cable are in storage is - ANSWER To keep
moisture from creeping in
The outer covering on liguid-tight flexible metal conduit is used for - ANSWER A moisture seal
A good electrical connection should - ANSWER Be mechanically and electrically secure
The symbol normally used for duplex - ANSWER Circle with two parallel lines drawb through it
Disconnecting means are covered in - ANSWER NEC Section 110-22
In relation to switches, the term throw refers to the - ANSWER Number of internal operations
that a switch can perform
A 3-phase, 4-wire, 480v service requires ______ current transformer(s) - ANSWER 3
Services conductors and equipment are covered in - ANSWER NEC Article 230
The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits be ______
receptacles - ANSWER Grounding
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
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
