Article 100-110 Quiz02 - Electrician Exam Practice

Article 100-110 Quiz02

This quiz includes 20 questions selected from NEC Articles 100 to 110. The questions are chosen randomly, with no repeats from other quizzes—unless a particular question is used again on purpose because it relates to more than one topic, such as both cable ampacity and cable application.

If you spot any issues or have suggestions, you’re welcome to report questions or review the quiz. Your feedback matters, and contributions to help improve and refine the questions and quizzes are always appreciated.

Safety is a primary concern here.

1 / 20

What does "Dead-Front" mean in electrical equipment?

a. Accessible only by qualified personnel.

b. Insulated to prevent electrical shocks.

c. Enclosed with a protective barrier.

d. Without live parts exposed to a person on the operating side.

The minimum working distance is determined by the voltage and whether live or grounded parts are present on the opposite side of the workspace.

2 / 20

A 120-208V 3-phase panel with exposed live parts on one side, and no live or grounded parts on the other side of the working space, must have a minimum clear working distance of _______________ in front of the panel.

a. 3 feet 6 inches

b. 3 feet

c. 4 feet 6 inches

d. 4 feet

The key is the device's capacity to handle overcurrent within its operational range, which starts from its specified rating.

3 / 20

A branch-circuit OCPD is a device capable of providing protection for service, feeder, and branch circuits and equipment over the full range of over-currents between its _______________ and its interrupting rating.

a. Rated voltage

b. Rated current

c. Rated over-current rating

d. Short-circuit

Backup power is a key concept here.

4 / 20

What is an "Alternate Power Source"?

a. A public utility service always running in parallel.

b. One or more generator sets or battery systems intended to provide power during interruption of the normal electrical service.

c. A set of transformers used for backup power.

d. A combination of multiple energy sources for efficiency.

Focus on detecting and mitigating electrical arcs.

5 / 20

What is the primary function of an "Arc-Fault Circuit Interrupter (AFCI)"?

a. To disconnect circuits during overcurrent conditions.

b. To provide protection from the effects of arc faults by de-energizing the circuit when detected.

c. To monitor voltage stability in high-power circuits.

d. To serve as a backup overcurrent device.

It ensures electrical continuity.

6 / 20

What does "Bonded" mean?

a. Grounded through a grounding electrode.

b. Insulated to prevent conductivity.

c. Connected to establish electrical continuity and conductivity.

d. Shielded from electrical interferences.

Approval requires jurisdictional consent.

7 / 20

What is the meaning of "Approved" in NEC terminology?

a. Acceptable to the authority having jurisdiction.

b. Certified by the manufacturer.

c. Listed in an NFPA standard.

d. Verified by any professional inspector.

This type of equipment directly consumes electric energy to perform its function.

8 / 20

_______________ equipment utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes.

a. Signaling

b. Cord-and-plug connected

c. Heating

d. Utilization

This type of enclosure is designed for ease of access to the electrical components it houses.

9 / 20

A _______________ is an enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the enclosure.

a. Panelboard

b. Cutout box

c. Cabinet

d. Switchgear

Ampacity involves continuous current limits.

10 / 20

What does "Ampacity" refer to?

a. The minimum voltage a conductor can handle continuously.

b. The maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

c. The short-circuit current a conductor can sustain.

d. The resistance offered by a conductor at rated temperature.

This involves the final section of a circuit.

11 / 20

What does "Branch Circuit" refer to?

a. Conductors feeding a transformer.

b. A circuit running between panels.

c. The connection between a main panel and subpanel.

d. The circuit conductors between the final overcurrent device and the outlets.

The interrupting rating must be sufficient to handle the maximum current the equipment may encounter without failure.

12 / 20

Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage _______________ the current that must be interrupted.

a. At least greater than

b. Matching

c. At least equal to

d. At most, less than

This definition includes multiple fixture types.

13 / 20

What is a "Bathroom" as defined in Article 100?

a. A room with plumbing fixtures.

b. A room containing only a toilet.

c. Any room with a sink.

d. An area including a sink with one or more of the following: a toilet, a urinal, a tub, a shower, or similar plumbing fixtures.

This definition applies specifically to conductors used in overhead service installations.

14 / 20

The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop or overhead service conductors, is defined as what?

a. Service Equipment

b. Service Drop

c. Service Entrance Conductors (Underground)

d. Service Entrance Conductors (Overhead)

Think about processes that don’t need human action.

15 / 20

How is "Automatic" defined in Article 100?

a. Performing a function without the necessity of human intervention.

b. A process triggered by external signals.

c. A function requiring minimal human intervention.

d. A process triggered by external signals.

The interrupting rating must be sufficient to handle the maximum current the equipment may encounter without failure.

16 / 20

Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage _______________ the current that must be interrupted.

a. At least greater than

b. Matching

c. At least equal to

d. At most, less than

This definition includes control of motor speed.

17 / 20

How is "Adjustable Speed Drive" defined in the NEC?

a. Power conversion equipment that provides a means of adjusting the speed of an electric motor.

b. A power supply that adjusts motor voltages.

c. A power supply that adjusts motor voltages.

d. A device that provides constant speed to motors.

For wide switchgear and control panels, the NEC mandates adequate access to ensure safety and compliance with clearance requirements.

18 / 20

On switchgear and control panels exceeding _______________ in width, there shall be one entrance at each end of the equipment.

a. 6 feet

b. 4 feet

c. 4 1/2 feet

d. 5 feet

This device protects against overcurrent.

19 / 20

What is a "Circuit Breaker"?

a. A device designed to open and close a circuit automatically or manually and to open the circuit automatically on overcurrent.

b. A fuse used to protect electrical circuits.

c. emergency

d. A device that controls voltage variations in a circuit.

The clearance requirement increases when grounded parts are present opposite exposed live parts in the working space.

20 / 20

Exposed live parts on one side of the working space and grounded parts on the other side of the working space must have _______________ clearance in a 277-volt to ground.

a. 3 feet

b. 3 feet 6 inches

c. 4 feet

d. 2 feet 6 inches

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