Deck 5: Switches and Receptacles

Question 1

When the wiring method is cable, you are stuck with the conductor insulation colors typically provided by the manufacturer. For three conductor cable, this will typically be black, white, and ____.

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

Answer 1

A

Question 2

To reduce "electrical noise" (electromagnetic interference), circuits with receptacle outlets that serve loads such as cash registers, computers, or other sensitive electronic equipment are often supplied by ____ receptacles.

A)low-pass filtered
B)high-pass filtered
C)isolated ground
D)hospital-grade

Answer 2

C

Question 3

What is electrical noise, and what is its source?

Answer 3

"Electrical noise," as referred to when discussing electronic equipment, is any extraneous signal that tends to interfere with the signal normally present in or passing through a system. Induced noise might be EMI (electromagnetic interference)or RFI (radio frequency interference). It might be heard as a hum, buzzing, whining, or static. The cause might be traced to such things as an electric motor, ignition on a furnace, fluorescent and other types of electronic discharge luminaires, nearness to a power line, arc welders, power-supply switching circuits, cellular phones, other audio/video equipment, office electronic equipment, and nearness of computer cables to electric light and power wiring. These things are capable of creating unwanted waveforms that can scramble or distort digital signals.

Question 4

The cover placed on a recessed box containing a receptacle or a switch is called a ____.

A)groundplate
B)faceplate
C)raised cover
D)double-pole

Question 5

An acceptable impedance for the grounding path associated with normal equipment grounding for branch-circuit wiring is ____ ohms.

A)1 to 2
B)3 to 4
C)5 to 6
D)7 to 8

Question 6

In locations where severe abuse or heavy use is expected, ____ receptacles are recommended.

A)electronic equipment
B)hospital-grade
C)isolated ground
D)locking plug

Question 7

A 3-way switch has a common terminal to which the switch blade is always connected, and it has two other terminals called ____ terminals.

A)mover
B)utility
C)traveler
D)mobile

Question 8

What is the difference between the acceptable impedance of a ground path for branch-circuit wiring and the acceptable impedance for electronic equipment?

Question 9

When using cable for the wiring of 3-way switches, NEC 200.7(C)(1)permits the use of a conductor with insulation that is white or ____ or has three continuous white stripes (not too common)as a switch supply only if the conductor is permanently reidentified by painting or other effective means.

A)black
B)red
C)green
D)gray

Question 10

An ac-dc general-use snap switch is always marked with the ____.

A)resistance
B)year of manufacture
C)phrase "ac-dc switch"
D)current and voltage rating

Question 11

How common are double-pole switches, and where are they used?

Question 12

A ____ switch is used where it is desired to control a light or group of lights, or other load, from one switching point.

A)three-way
B)single-pole
C)four-way
D)traveler

Question 13

Isolated ground receptacles are required by NEC 406.3(D) to have a(n)____ triangle on their face.

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

Question 14

Most electricians refer to ____ switches as "toggle switches" or "wall switches."

A)snap
B)pressure
C)float
D)general

Question 15

How do you prevent neutral conductors from overheating?

Question 16

An ungrounded conductor is also known as a ____ conductor.

A)hot
B)ground
C)neutral
D)positive

Question 17

In commercial buildings, ____ protection is required for all 125-volt through 250-volt , single-phase 50-ampere receptacles  or less, and three-phase 100 amperes or less,  installed in bathrooms, in kitchens, on rooftops, outdoors, within 6 ft (1.8 m)from the outside edge of any sink, in indoor  damp and  wet locations, in locker rooms with associated shower facilities, garages,  accessory buildings, service bays, and similar areas , crawl spaces, unfinished areas of basements, laundry areas, and bathtubs and shower stalls.

A)NEC
B)EWC
C)GFCI
D)HOT

Question 18

How are snap switches and metal faceplates grounded?

Question 19

The differences in plugs and receptacles are based on the ____ and voltage rating of the device.

A)resistance
B)conductance
C)geometry
D)ampere

Question 20

Quality voltage provides a clean ____ wave that is free from distortion.

A)triangle
B)sine
C)square
D)sawtooth