CIW Chapter 9

Question 1

In large industrial facilities, underground feeders usually operate at voltages of ___V and higher.

Answer 1

600

Question 2

A ___ is a connection from one conductor to another to obtain power from the conductor to which the connection occurs.

Answer 2

tap

Question 3

A three-pole, single-throw switch is abbreviated as ___.

Answer 3

3PST

Question 4

The amount of light a lamp produces is expressed in ___.

Answer 4

lumens (lm)

Question 5

Because motors vibrate as they operate, ___ is often used for the last 6’ or less of raceway prior to entering the motor.

Answer 5

LFMC

Question 6

A(n) ___ receptacle is used for protection for computers and other sensitive electronic equipment from electromagnetic interference and electrical noise caused by harmonics and undesirable current flow on the EGC.

Answer 6

isolated ground

Question 7

A ___ lamp produces light when current flows through sodium vapor under high pressure and high temperature.

Answer 7

high-pressure sodium

Question 8

Tap conductors that run from an outlet boxing’s an overhead raceway to a luminaire with AC or MC cable must be at least 18” but not more than ___’ in length.

Answer 8

6

Question 9

A(n) ___ branch circuit consists of a minimum of two ungrounded conductors with a potential difference between them, and a grounded conductor with a potential difference between it and the ungrounded conductors.

Answer 9

multiwire

Question 10

A ___ is an electrical overcorrect protection device with a fusible portion that is heated and broken by the passage of excessive current.

Answer 10

fuse

Question 11

A(n) ___ test is the momentary energizing of a motor before it is coupled to the load to observe the direction of rotation.

Answer 11

bump

Question 12

Most commercial and industrial lighting circuits operate at ___V.

Answer 12

277

Question 13

___ current is electric current that flows through insulators on a conductor.

Answer 13

Leakage

Question 14

Selection of overcurrent devices is decided by the ___ as part of the project design.

Answer 14

engineering firm

Question 15

A ___ is a device or group of devices used to manually or automatically control electric power to a motor.

Answer 15

motor controller

Question 16

A(n) ___ receptacle is identified by a “test” and “reset” button on the face of the receptacle.

Answer 16

ground-fault circuit interrupter (GFCI)

Question 17

Per the NEC, voltage drop on a feeder should never exceed ___%

Answer 17

3

Question 18

The four basic types of HID lamps used in commercial and industrial installations include low-pressure sodium, mercury vapor, high-pressure sodium, and ___.

Answer 18

metal halide

Question 19

GFCI receptacles trip when the difference between ungrounded and ___ conductor current exceeds a difference of 4 mA to 6 mA.

Answer 19

grounded

Question 20

The total combined voltage drop of the feeder and branch circuit should be no greater than ___%

Answer 20

5

Question 21

In a(n) ___ bend, the conductor does not enter or leave the enclosure through the wall opposite its terminals.

Answer 21

L

Question 22

___ are intended for the protection of personnel and rapidly de-energizes a circuit when the current to ground exceeds 4 mA to 6 mA.

Answer 22

Ground-fault circuit interrupters

Question 23

A ___ is a complete lighting unit including the components that distribute light, position and protect the lamps, and provide connection to the power supply.

Answer 23

luminaire

Question 24

After the battery is installed, the emergency lighting unit must be tested to verify that the emergency lights can ___.

Answer 24

function during a power loss

Question 25

___ frequency is the very high frequency (from about 1 kHz to about 20 kHz) of the short voltage pulses of varying length that stimulate a lower frequency.

Answer 25

Carrier