Question 1

Most low-voltage, remote-control systems are wired with AWG conductors.

Accepted Answer

A) 10 
B) 14 
C) 20 
D) 32 
A) 10 
B) 14 
C) 20 
D) 32 C

Question 2

NEC 725.136(A) Class 2 circuits in the same raceway or cable as the wiring for light and power.

Accepted Answer

A) limits the number of 
B) limits the voltage of 
C) prohibits 
D) mandates 
A) limits the number of 
B) limits the voltage of 
C) prohibits 
D) mandates C

Question 3

Give one advantage and one disadvantage to installing low-voltage wiring in a raceway.

Accepted Answer

Although the NEC does not require that the low-voltage wiring be installed in a raceway, the Specifications for the Commercial Building do contain this requirement.The advantage of using a raceway for the installation is that it provides a means for making future additions at a minimum cost.A disadvantage of this approach is the initial higher construction cost.

Question 4

The switch used in the low-voltage remote-control system is approximately the size of a standard single-pole switch.

Accepted Answer

A) one-sixth 
B) one-fourth 
C) one-third 
D) one-half 
A) one-sixth 
B) one-fourth 
C) one-third 
D) one-half

Question 5

Switches are available in up to -switch combinations with features such as pilot light, lighted toggle, and being key-operated.

Accepted Answer

A) 2 
B) 4 
C) 8 
D) 10 
A) 2 
B) 4 
C) 8 
D) 10

Question 6

Larger conductors should be used for long runs to minimize the .

Accepted Answer

A) current 
B) voltage drop 
C) transformer ratio 
D) interrupt rating 
A) current 
B) voltage drop 
C) transformer ratio 
D) interrupt rating

Question 7

What size knockout openings can relays be mounted through? What advantage does the plug-in relay have?

Accepted Answer

One style of relay is designed to mount

Question 8

To install color-coded cables correctly throughout an entire installation, the wires are connected to the , switches, master controls, and panel, like color to like color.

Accepted Answer

A) conductor 
B) relays 
C) circuit 
D) barrier 
A) conductor 
B) relays 
C) circuit 
D) barrier

Question 9

If control requirements are very complex or extensive, a can be installed.

Accepted Answer

A) master sequencer 
B) transistor 
C) conventional switch 
D) double relay 
A) master sequencer 
B) transistor 
C) conventional switch 
D) double relay

Question 10

The switch used in the low-voltage remote-control system is a normally open, , momentary contact switch.

Accepted Answer

A) double-pole, double-throw 
B) single-pole, double-throw 
C) single-pole, single-throw 
D) double-pole, single-throw 
A) double-pole, double-throw 
B) single-pole, double-throw 
C) single-pole, single-throw 
D) double-pole, single-throw

Question 11

What happens to a transformer in the case of an overload?

Accepted Answer

The circuit transformer is designed so t

Question 12

To simplify connections, the conductor color-coding combinations are red-black-white, red-black-yellow-white, red- black-yellow plus an 18 AWG common , red-black-blue-white, and red-black-yellow-blue-white.

Accepted Answer

A) orange 
B) white 
C) blue 
D) green 
A) orange 
B) white 
C) blue 
D) green

Question 13

The is used in an installation where several relays are mounted in one enclosure.

Accepted Answer

A) gasket relay 
B) double-throw relay 
C) plug-in relay 
D) standard relay 
A) gasket relay 
B) double-throw relay 
C) plug-in relay 
D) standard relay

Question 14

The principle of operation of a master control with rectifiers is based on the fact that a rectifier permits current in direction(s).

Accepted Answer

A) only one 
B) two 
C) at least three 
D) all 
A) only one 
B) two 
C) at least three 
D) all

Question 15

A low-voltage remote-control wiring system is operated.

Accepted Answer

A) resistor 
B) capacitor 
C) transistor 
D) relay 
A) resistor 
B) capacitor 
C) transistor 
D) relay

Question 16

identifying the switch's functions can be prepared and inserted in the switch cover.

Accepted Answer

A) Microchips 
B) Directory strips 
C) LEDs 
D) Relays 
A) Microchips 
B) Directory strips 
C) LEDs 
D) Relays

Question 17

Give an overview of how a relay-based low-voltage remote-control system operates.

Accepted Answer

A low-voltage remote-control wiring syst

Question 18

When are low-voltage remote-control systems advantageous?

Accepted Answer

A method known as low-voltage remote con

Question 19

In a Class 2 circuit, because the power source of the circuit is limited, overcurrent protection is required.

Accepted Answer

A) fuse-based 
B) circuit-breaker-based 
C) no 
D) minimum 
A) fuse-based 
B) circuit-breaker-based 
C) no 
D) minimum

Question 20

The low-voltage relay is available in mounting styles.

Accepted Answer

A) one 
B) two 
C) three 
D) four 
A) one 
B) two 
C) three 
D) four

Exam 20: Low-Voltage Remote-Control

Most low-voltage, remote-control systems are wired with AWG conductors.

NEC 725.136(A) Class 2 circuits in the same raceway or cable as the wiring for light and power.

Give one advantage and one disadvantage to installing low-voltage wiring in a raceway.

The switch used in the low-voltage remote-control system is approximately the size of a standard single-pole switch.

Switches are available in up to -switch combinations with features such as pilot light, lighted toggle, and being key-operated.

Larger conductors should be used for long runs to minimize the .

What size knockout openings can relays be mounted through? What advantage does the plug-in relay have?

To install color-coded cables correctly throughout an entire installation, the wires are connected to the , switches, master controls, and panel, like color to like color.

If control requirements are very complex or extensive, a can be installed.

The switch used in the low-voltage remote-control system is a normally open, , momentary contact switch.

What happens to a transformer in the case of an overload?

To simplify connections, the conductor color-coding combinations are red-black-white, red-black-yellow-white, red- black-yellow plus an 18 AWG common , red-black-blue-white, and red-black-yellow-blue-white.

The is used in an installation where several relays are mounted in one enclosure.

The principle of operation of a master control with rectifiers is based on the fact that a rectifier permits current in direction(s).

A low-voltage remote-control wiring system is operated.

identifying the switch's functions can be prepared and inserted in the switch cover.

Give an overview of how a relay-based low-voltage remote-control system operates.

When are low-voltage remote-control systems advantageous?

In a Class 2 circuit, because the power source of the circuit is limited, overcurrent protection is required.

The low-voltage relay is available in mounting styles.

Commercial Building Plans and Specifications

Reading Electrical Working Drawings- Entry Level

Calculating the Electrical Load

Branch Circuits

Switches and Receptacles

Wiring Methods

Motor and Appliance Circuits

Feeders

Special Systems

Working Drawings- Upper Level

Special Circuits Owners Circuits

Panelboard Selection and Installation

The Electric Service

Lamps and Ballasts for Lighting

Luminaires

Emergency, Legally Required Sstandby, and Optional Standby Power Systems

Overcurrent Protection: Fuses and Circuit Breakers

Short-Circuit Calculations and Coordination of Overcurrent Protective Devices

Equipment and Conductor Short-Circuit Protection

The Cooling System

Commercial Utility Interactive Photovoltaic Systems

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