Question 1

What factors cause losses in ferrous raceways in an ac circuit?

Accepted Answer

Losses in ferrous raceways and enclosures in an alternating current circuit are caused by: 
 .eddy currents-the current induced in ferrous metals, and 
. hysteresis losses-power loss that creates heat in a ferrous metal as a result of the molecules continually reversing. 
 Eddy currents and hysteresis losses create heat, which damages conductor insulation. Circuits where all of the conductors are close together have lower inductive reactance than circuits where the conductors are spaced farther apart.

Question 2

Compression fittings for EMT are classified as raintight and ____-tight types.

Accepted Answer

B

Question 3

____ boxes are used primarily to install ceiling outlets.

Accepted Answer

B

Question 4

Where PVC conduit is connected to a box or enclosure, a ____ is recommended.

Accepted Answer

The answer of Where PVC conduit is connected to a...

Question 5

Conduit bodies are often referred to in the trade as "Condulets" and "____."

Accepted Answer

The answer of Conduit bodies are often referred to in...

Question 6

When pulling three conductors or cables into a raceway, if the ratio of the raceway diameter to the conductor diameter is between 2.8 and 3.2, jamming can occur. With ____ or more conductors or cables, jamming is highly unlikely.

Accepted Answer

The answer of When pulling three conductors or cables into...

Question 7

Voltage drop in a circuit is calculated by multiplying the current flow times the ____.

Accepted Answer

The answer of Voltage drop in a circuit is calculated...

Question 8

When a box contains fittings such as luminaire studs, clamps, or hickeys, the number of conductors permitted in the box is one less for ____ device.

Accepted Answer

The answer of When a box contains fittings such as...

Question 9

The term ____ is defined by the NEC as a channel that is designed expressly for holding wires, cables, or busbars.

Accepted Answer

The answer of The term ____ is defined by the...

Question 10

____ is a thin-wall metal raceway that is not permitted to be threaded.

Accepted Answer

The answer of ____ is a thin-wall metal raceway that...

Question 11

Liquidtight flexible nonmetallic conduit marked as ____ has a smooth seamless inner core and cover bonded together and one or more reinforcement layers between the core and covers for layered conduit .

Accepted Answer

The answer of Liquidtight flexible nonmetallic conduit marked as ____...

Question 12

Type MC cable is a factory assembly of one or more insulated circuit conductors with or without optical fiber members enclosed in an armor of ____ metal tape, or a smooth or corrugated metallic sheath.

Accepted Answer

The answer of Type MC cable is a factory assembly...

Question 13

The two most popular types of PVC are Schedule 40 and Schedule ____.

Accepted Answer

The answer of The two most popular types of PVC...

Question 14

On what factors do the conduit and tubing size required for an installation depend?

Accepted Answer

The answer of On what factors do the conduit and...

Question 15

When may liquidtight flexible metallic conduit be used?

Accepted Answer

The answer of When may liquidtight flexible metallic conduit be...

Question 16

"Inverse time" refers to the speed of opening of ____.

Accepted Answer

The answer of "Inverse time" refers to the speed of...

Question 17

What is a running thread, and how can it be used?

Accepted Answer

The answer of What is a running thread, and how...

Question 18

A(n)____ box is used for surface or concealed installations.

Accepted Answer

The answer of A(n)____ box is used for surface or...

Question 19

Flexible metal and nonmetallic conduit are commonly used to connect recessed or lay-in ____. When used in this manner, electricians refer to it as a "fixture whip."

Accepted Answer

The answer of Flexible metal and nonmetallic conduit are commonly...

Question 20

Of what must you be especially careful regarding the depth of the box you are using?

Accepted Answer

The answer of Of what must you be especially careful...

Quiz 6: Wiring Methods