The electrical NCCER test Questions All
Solved Correctly 2025/2026
Which Article of the NEC covers grounding? - CORRECT ANSWER- article 250
Which of the following is a 90 degree, explosion proof fitting? - CORRECT ANSWER-
GUAL
What is a dropout plate? - CORRECT 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: -
CORRECT ANSWER- 372/575 3-PHASE, 4-WIRE
What does a GFCI breaker do? - CORRECT ANSWER- Opens a circuit to prevent
operation of an electrical device
What will happen when one or more coils in a winding are grounded? - CORRECT
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? - CORRECT ANSWER- 13.3 amps
The must be grounded in a bussed gutter if used as the main service equipment. -
CORRECT ANSWER- Neutral busbar
When wall mounting cable tray, ensure that - CORRECT 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 - CORRECT
ANSWER- To keep moisture from creeping in
The outer covering on liguid-tight flexible metal conduit is used for - CORRECT
ANSWER- A moisture seal
A good electrical connection should - CORRECT ANSWER- Be mechanically and
electrically secure
,The symbol normally used for duplex - CORRECT ANSWER- Circle with two parallel
lines drawb through it
Disconnecting means are covered in - CORRECT ANSWER- NEC Section 110-22
In relation to switches, the term throw refers to the - CORRECT ANSWER- Number of
internal operations that a switch can perform
A 3-phase, 4-wire, 480v service requires ______ current transformer(s) - CORRECT
ANSWER- 3
Services conductors and equipment are covered in - CORRECT ANSWER- NEC Article
230
The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits
be ______ receptacles - CORRECT ANSWER- Grounding
A transformer with the primary of 400 turns and a secondary of 300 turns has a _____ -
CORRECT ANSWER- Step-down turns ratio of 4:3
The circular mil is based on the - CORRECT ANSWER- Cross-sectional area of the
wire
Of the termination classes listed below, ____ is the only one that provides a seal
against external elements. - CORRECT ANSWER- Class 1
Unless otherwise noted. the calculations in AC circuits _____ values. - CORRECT
ANSWER- Rms
When the coil turns are increased the _____ - CORRECT ANSWER- Induced voltage is
increased
As the temperature surrounding a self-regulating heating cable rises, the ____ -
CORRECT ANSWER- Resistance of the polymeric core increases
The motor type that has the highest starting torque is the ____ motor. - CORRECT
ANSWER- Capacitor-start
For a given number of poles, the ____ determines the speed of an AC motor. -
CORRECT ANSWER- Frequency
, Both induction and synchronous motors operate on the principle of a rotating ____ field
- CORRECT 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: - CORRECT ANSWER-
90Volts
The output capacity of a motor is rated in - CORRECT ANSWER- Horsepower
The synchronous speed at which a pole, 60 Hz induction motor operates is rpm. -
CORRECT ANSWER- 1,800
The sine of 0 degree is - CORRECT ANSWER- 0
Meters used in AC circuits indicate the - CORRECT ANSWER- Effective
The component labeled 7 in figure 1 is a(n) - CORRECT ANSWER- End seal
In an AC circuit containing resistance only _____ will flow if the resistance is 10 ohms
and the voltage is 120V. - CORRECT ANSWER- 12A
The _____ rotor types are generally rugged. - CORRECT ANSWER- Squirrel cage
Proofs tests are made at_ of the original factory voltage. - CORRECT ANSWER- 60%
Which type of heating cable cannot be cut and terminated in the field? - CORRECT
ANSWER- Mineral insulated
The secondary of a CT under load should not be opened because of_. - CORRECT
ANSWER- Induced high voltage
In a transformer ______ - CORRECT ANSWER- Electromagnetic Induction Ocurs
When a ground rod is installed, the top of the rod must be positioned ______ grade. -
CORRECT ANSWER- Flush with or below
When making offset bends, the two kicks must be made perfectly parallel or the
resulting offset will have a _____ - CORRECT ANSWER- Crooked Bend
Solved Correctly 2025/2026
Which Article of the NEC covers grounding? - CORRECT ANSWER- article 250
Which of the following is a 90 degree, explosion proof fitting? - CORRECT ANSWER-
GUAL
What is a dropout plate? - CORRECT 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: -
CORRECT ANSWER- 372/575 3-PHASE, 4-WIRE
What does a GFCI breaker do? - CORRECT ANSWER- Opens a circuit to prevent
operation of an electrical device
What will happen when one or more coils in a winding are grounded? - CORRECT
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? - CORRECT ANSWER- 13.3 amps
The must be grounded in a bussed gutter if used as the main service equipment. -
CORRECT ANSWER- Neutral busbar
When wall mounting cable tray, ensure that - CORRECT 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 - CORRECT
ANSWER- To keep moisture from creeping in
The outer covering on liguid-tight flexible metal conduit is used for - CORRECT
ANSWER- A moisture seal
A good electrical connection should - CORRECT ANSWER- Be mechanically and
electrically secure
,The symbol normally used for duplex - CORRECT ANSWER- Circle with two parallel
lines drawb through it
Disconnecting means are covered in - CORRECT ANSWER- NEC Section 110-22
In relation to switches, the term throw refers to the - CORRECT ANSWER- Number of
internal operations that a switch can perform
A 3-phase, 4-wire, 480v service requires ______ current transformer(s) - CORRECT
ANSWER- 3
Services conductors and equipment are covered in - CORRECT ANSWER- NEC Article
230
The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits
be ______ receptacles - CORRECT ANSWER- Grounding
A transformer with the primary of 400 turns and a secondary of 300 turns has a _____ -
CORRECT ANSWER- Step-down turns ratio of 4:3
The circular mil is based on the - CORRECT ANSWER- Cross-sectional area of the
wire
Of the termination classes listed below, ____ is the only one that provides a seal
against external elements. - CORRECT ANSWER- Class 1
Unless otherwise noted. the calculations in AC circuits _____ values. - CORRECT
ANSWER- Rms
When the coil turns are increased the _____ - CORRECT ANSWER- Induced voltage is
increased
As the temperature surrounding a self-regulating heating cable rises, the ____ -
CORRECT ANSWER- Resistance of the polymeric core increases
The motor type that has the highest starting torque is the ____ motor. - CORRECT
ANSWER- Capacitor-start
For a given number of poles, the ____ determines the speed of an AC motor. -
CORRECT ANSWER- Frequency
, Both induction and synchronous motors operate on the principle of a rotating ____ field
- CORRECT 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: - CORRECT ANSWER-
90Volts
The output capacity of a motor is rated in - CORRECT ANSWER- Horsepower
The synchronous speed at which a pole, 60 Hz induction motor operates is rpm. -
CORRECT ANSWER- 1,800
The sine of 0 degree is - CORRECT ANSWER- 0
Meters used in AC circuits indicate the - CORRECT ANSWER- Effective
The component labeled 7 in figure 1 is a(n) - CORRECT ANSWER- End seal
In an AC circuit containing resistance only _____ will flow if the resistance is 10 ohms
and the voltage is 120V. - CORRECT ANSWER- 12A
The _____ rotor types are generally rugged. - CORRECT ANSWER- Squirrel cage
Proofs tests are made at_ of the original factory voltage. - CORRECT ANSWER- 60%
Which type of heating cable cannot be cut and terminated in the field? - CORRECT
ANSWER- Mineral insulated
The secondary of a CT under load should not be opened because of_. - CORRECT
ANSWER- Induced high voltage
In a transformer ______ - CORRECT ANSWER- Electromagnetic Induction Ocurs
When a ground rod is installed, the top of the rod must be positioned ______ grade. -
CORRECT ANSWER- Flush with or below
When making offset bends, the two kicks must be made perfectly parallel or the
resulting offset will have a _____ - CORRECT ANSWER- Crooked Bend
