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The electrical NCCER test Questions with Detailed
Verified Answers
Which Article of the NEC covers grounding? Ans: ✓ ✓ ✓ article 250
Which of the following is a 90 degree, explosion proof fitting? Ans: ✓ ✓ ✓ GUAL
What is a dropout plate? Ans: ✓ ✓ ✓ 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: Ans: ✓ ✓ ✓ 372/575
3-PHASE, 4-WIRE
What does a GFCI breaker do? Ans: ✓ ✓ ✓ Opens a circuit to prevent operation of an electrical
device
What will happen when one or more coils in a winding are grounded? Ans: ✓ ✓ ✓ 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? Ans: ✓ ✓ ✓ 13.3 amps
The must be grounded in a bussed gutter if used as the main service equipment. Ans: ✓ ✓ ✓
Neutral busbar
When wall mounting cable tray, ensure that Ans: ✓ ✓ ✓ 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 Ans: ✓ ✓ ✓ To keep
moisture from creeping in
The outer covering on liguid-tight flexible metal conduit is used for Ans: ✓ ✓ ✓ A moisture seal
A good electrical connection should Ans: ✓ ✓ ✓ Be mechanically and electrically secure
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The symbol normally used for duplex Ans: ✓ ✓ ✓ Circle with two parallel lines drawb through it
Disconnecting means are covered in Ans: ✓ ✓ ✓ NEC Section 110-22
In relation to switches, the term throw refers to the Ans: ✓ ✓ ✓ Number of internal operations
that a switch can perform
A 3-phase, 4-wire, 480v service requires ______ current transformer(s) Ans: ✓ ✓ ✓ 3
Services conductors and equipment are covered in Ans: ✓ ✓ ✓ NEC Article 230
The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits be ______
receptacles Ans: ✓ ✓ ✓ Grounding
A transformer with the primary of 400 turns and a secondary of 300 turns has a _____ Ans: ✓ ✓ ✓
Step-down turns ratio of 4:3
The circular mil is based on the Ans: ✓ ✓ ✓ Cross-sectional area of the wire
Of the termination classes listed below, ____ is the only one that provides a seal against external
elements. Ans: ✓ ✓ ✓ Class 1
Unless otherwise noted. the calculations in AC circuits _____ values. Ans: ✓ ✓ ✓ Rms
When the coil turns are increased the _____ Ans: ✓ ✓ ✓ Induced voltage is increased
As the temperature surrounding a self-regulating heating cable rises, the ____ Ans: ✓ ✓ ✓
Resistance of the polymeric core increases
The motor type that has the highest starting torque is the ____ motor. Ans: ✓ ✓ ✓ Capacitor-start
For a given number of poles, the ____ determines the speed of an AC motor. Ans: ✓ ✓ ✓
Frequency
Both induction and synchronous motors operate on the principle of a rotating ____ field Ans: ✓ ✓
✓ 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: Ans: ✓ ✓ ✓ 90Volts
The output capacity of a motor is rated in Ans: ✓ ✓ ✓ Horsepower
© Get it right 2025 Getaway - Stuvia US All rights reserved
The electrical NCCER test Questions with Detailed
Verified Answers
Which Article of the NEC covers grounding? Ans: ✓ ✓ ✓ article 250
Which of the following is a 90 degree, explosion proof fitting? Ans: ✓ ✓ ✓ GUAL
What is a dropout plate? Ans: ✓ ✓ ✓ 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: Ans: ✓ ✓ ✓ 372/575
3-PHASE, 4-WIRE
What does a GFCI breaker do? Ans: ✓ ✓ ✓ Opens a circuit to prevent operation of an electrical
device
What will happen when one or more coils in a winding are grounded? Ans: ✓ ✓ ✓ 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? Ans: ✓ ✓ ✓ 13.3 amps
The must be grounded in a bussed gutter if used as the main service equipment. Ans: ✓ ✓ ✓
Neutral busbar
When wall mounting cable tray, ensure that Ans: ✓ ✓ ✓ 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 Ans: ✓ ✓ ✓ To keep
moisture from creeping in
The outer covering on liguid-tight flexible metal conduit is used for Ans: ✓ ✓ ✓ A moisture seal
A good electrical connection should Ans: ✓ ✓ ✓ Be mechanically and electrically secure
© Get it right 2025 Getaway - Stuvia US All rights reserved
, Click here for more: Scholars nexus
The symbol normally used for duplex Ans: ✓ ✓ ✓ Circle with two parallel lines drawb through it
Disconnecting means are covered in Ans: ✓ ✓ ✓ NEC Section 110-22
In relation to switches, the term throw refers to the Ans: ✓ ✓ ✓ Number of internal operations
that a switch can perform
A 3-phase, 4-wire, 480v service requires ______ current transformer(s) Ans: ✓ ✓ ✓ 3
Services conductors and equipment are covered in Ans: ✓ ✓ ✓ NEC Article 230
The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits be ______
receptacles Ans: ✓ ✓ ✓ Grounding
A transformer with the primary of 400 turns and a secondary of 300 turns has a _____ Ans: ✓ ✓ ✓
Step-down turns ratio of 4:3
The circular mil is based on the Ans: ✓ ✓ ✓ Cross-sectional area of the wire
Of the termination classes listed below, ____ is the only one that provides a seal against external
elements. Ans: ✓ ✓ ✓ Class 1
Unless otherwise noted. the calculations in AC circuits _____ values. Ans: ✓ ✓ ✓ Rms
When the coil turns are increased the _____ Ans: ✓ ✓ ✓ Induced voltage is increased
As the temperature surrounding a self-regulating heating cable rises, the ____ Ans: ✓ ✓ ✓
Resistance of the polymeric core increases
The motor type that has the highest starting torque is the ____ motor. Ans: ✓ ✓ ✓ Capacitor-start
For a given number of poles, the ____ determines the speed of an AC motor. Ans: ✓ ✓ ✓
Frequency
Both induction and synchronous motors operate on the principle of a rotating ____ field Ans: ✓ ✓
✓ 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: Ans: ✓ ✓ ✓ 90Volts
The output capacity of a motor is rated in Ans: ✓ ✓ ✓ Horsepower
© Get it right 2025 Getaway - Stuvia US All rights reserved
