Question 1

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

Accepted Answer

A) True 
 B)False  False

Question 2

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 A

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

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

Accepted Answer

A)  10 
B)  3 to 5 
C)  40 to 50 
D)  90 
A)  10 
B)  3 to 5 
C)  40 to 50 
D)  90

Question 5

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 6

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

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A)  15 
B)  50 
C)  5 
D)  25 
A)  15 
B)  50 
C)  5 
D)  25

Question 8

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

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

____ 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 11

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

Accepted Answer

A) True 
 B)False

Question 12

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 13

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 14

What does the abbreviation GFP stand for?

Accepted Answer

A)  Ground-Field Protector 
B)  Ground-Fire Prevention 
C)  Ground-Fault Protector 
D)  Ground-Flux Prevention 
A)  Ground-Field Protector 
B)  Ground-Fire Prevention 
C)  Ground-Fault Protector 
D)  Ground-Flux Prevention

Question 15

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

Accepted Answer

A)  10 
B)  3 to 5 
C)  40 to 50 
D)  90 
A)  10 
B)  3 to 5 
C)  40 to 50 
D)  90

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 ____.

Which frequency is a harmonic of 60 Hz?

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

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.

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

Which NEC Article covers grounding locations and methods?

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

____ may be installed in a substation unit.

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

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

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.

What does the abbreviation GFP stand for?

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

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

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

Which frequency is a harmonic of 60 Hz?

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

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.

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

Which NEC Article covers grounding locations and methods?

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

____ may be installed in a substation unit.

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

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

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.

What does the abbreviation GFP stand for?

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

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