Question 1

The effect of a harmonic on the current flowing in the supply conductors is approximately ____ percent.

Accepted Answer

A)  less than 1 
B)  3-5 
C)  10-20 
D)  80-90 
A)  less than 1 
B)  3-5 
C)  10-20 
D)  80-90 B

Question 2

Which NEC Article covers grounding locations and methods?

Accepted Answer

A)  Article 79 
B)  Article 220 
C)  Article 250 
D)  Article 429 
A)  Article 79 
B)  Article 220 
C)  Article 250 
D)  Article 429 C

Question 3

Which frequency is a harmonic of 60 Hz?

Accepted Answer

A)  10 Hz 
B)  30 Hz 
C)  90 Hz 
D)  180 Hz 
A)  10 Hz 
B)  30 Hz 
C)  90 Hz 
D)  180 Hz D

Question 4

____ may be installed in a substation unit.

Accepted Answer

A)  Branch circuit conductors 
B)  Isolation switches 
C)  Main supply conductors 
D)  Utility poles 
A)  Branch circuit conductors 
B)  Isolation switches 
C)  Main supply conductors 
D)  Utility poles

Question 5

If the ungrounded (hot) conductor comes in contact with a metal enclosure that is not grounded, a ____ will be present between the enclosure and the ground.

Accepted Answer

A)  current 
B)  voltage 
C)  resistance 
D)  reactance 
A)  current 
B)  voltage 
C)  resistance 
D)  reactance

Question 6

Most single-phase systems are supplied from a three-phase primary.

Accepted Answer

A) True 
 B)False

Question 7

Which type of ground-fault protection is generally used for three-wire, single-phase, and for three-phase installations?

Accepted Answer

A)  GFP 
B)  GFCI 
C)  fuse 
D)  circuit breaker 
A)  GFP 
B)  GFCI 
C)  fuse 
D)  circuit breaker

Question 8

Large industrial establishments may find it more economical to distribute power at voltages higher than 600 volts.

Accepted Answer

A) True 
 B)False

Question 9

What does the abbreviation GFP stand for?

Accepted Answer

A)  Ground Fire Protection 
B)  Ground Fire Prevention 
C)  Ground Fault Protector 
D)  Ground Fault Prevention 
A)  Ground Fire Protection 
B)  Ground Fire Prevention 
C)  Ground Fault Protector 
D)  Ground Fault Prevention

Question 10

It has been proven that currents as small as ____ through the heart, lungs, or brain can be fatal.

Accepted Answer

A)  15 mA 
B)  50 mA 
C)  1 A 
D)  15 A 
A)  15 mA 
B)  50 mA 
C)  1 A 
D)  15 A

Question 11

The effect of a harmonic on the current flowing in the neutral conductor is approximately ____ percent.

Accepted Answer

A)  less than one 
B)  3-5 
C)  50 
D)  90 
A)  less than one 
B)  3-5 
C)  50 
D)  90

Question 12

The purpose of grounding is to limit the magnitude of current surges.

Accepted Answer

A) True 
 B)False

Question 13

In a radial distribution system, the central station supplies power to the various ____.

Accepted Answer

A)  substations 
B)  loops 
C)  residential units 
D)  industrial installations 
A)  substations 
B)  loops 
C)  residential units 
D)  industrial installations

Question 14

A loop distribution system is an electrical transmission system that begins at a central station and supplies power to various substations.

Accepted Answer

A) True 
 B)False

Question 15

The GFCI operates on the principle that an equal amount of current is flowing through the two wires.

Accepted Answer

A) True 
 B)False

The effect of a harmonic on the current flowing in the supply conductors is approximately ____ percent.

Which NEC Article covers grounding locations and methods?

Which frequency is a harmonic of 60 Hz?

____ may be installed in a substation unit.

If the ungrounded (hot) conductor comes in contact with a metal enclosure that is not grounded, a ____ will be present between the enclosure and the ground.

Most single-phase systems are supplied from a three-phase primary.

Which type of ground-fault protection is generally used for three-wire, single-phase, and for three-phase installations?

Large industrial establishments may find it more economical to distribute power at voltages higher than 600 volts.

What does the abbreviation GFP stand for?

It has been proven that currents as small as ____ through the heart, lungs, or brain can be fatal.

The effect of a harmonic on the current flowing in the neutral conductor is approximately ____ percent.

The purpose of grounding is to limit the magnitude of current surges.

In a radial distribution system, the central station supplies power to the various ____.

A loop distribution system is an electrical transmission system that begins at a central station and supplies power to various substations.

The GFCI operates on the principle that an equal amount of current is flowing through the two wires.

Language of Electricity

Electrical Fundamentals

Electrical Power and Energy

Test Equipment

Basic Resistive Electrical Circuits

Magnets and Magnetism

Alternating Current

Ac Circuits

Conductor Types and Sizes

Wiring Methods

Wiring Applications

Transformers

Lighting

Electric Heat

Dc Generators

Dc Motors

Ac Generators Alternators

Ac Motors

Motor Control Devices and Circuits

Basic Industrial Electronics

Dc Electronic Variable Speed Drives

Ac Inverter Drives

Programmable Logic Controllers

Filters

Exam 13: Electrical Distribution

The effect of a harmonic on the current flowing in the supply conductors is approximately ____ percent.

Which NEC Article covers grounding locations and methods?

Which frequency is a harmonic of 60 Hz?

____ may be installed in a substation unit.

If the ungrounded (hot) conductor comes in contact with a metal enclosure that is not grounded, a ____ will be present between the enclosure and the ground.

Most single-phase systems are supplied from a three-phase primary.

Which type of ground-fault protection is generally used for three-wire, single-phase, and for three-phase installations?

Large industrial establishments may find it more economical to distribute power at voltages higher than 600 volts.

What does the abbreviation GFP stand for?

It has been proven that currents as small as ____ through the heart, lungs, or brain can be fatal.

The effect of a harmonic on the current flowing in the neutral conductor is approximately ____ percent.

The purpose of grounding is to limit the magnitude of current surges.

In a radial distribution system, the central station supplies power to the various ____.

A loop distribution system is an electrical transmission system that begins at a central station and supplies power to various substations.

The GFCI operates on the principle that an equal amount of current is flowing through the two wires.

Language of Electricity

Electrical Fundamentals

Electrical Power and Energy

Test Equipment

Basic Resistive Electrical Circuits

Magnets and Magnetism

Alternating Current

Ac Circuits

Conductor Types and Sizes

Wiring Methods

Wiring Applications

Transformers

Lighting

Electric Heat

Dc Generators

Dc Motors

Ac Generators Alternators

Ac Motors

Motor Control Devices and Circuits

Basic Industrial Electronics

Dc Electronic Variable Speed Drives

Ac Inverter Drives

Programmable Logic Controllers

Filters