Quiz #5 Flashcards Preview

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Flashcards in Quiz #5 Deck (20):
1

The standard measuring unit of wire by its cross-sectional
area, as used in American wire tables is the
__________.

circular mils

2

Which of the AWG wire sizes listed below would have the smallest diameter?
A 0000
B 0
C 14
D 250

C 14

3

Which of the following statements concerning copper wire sized by AWG numbers is correct?
A Number 12 AWG wire has a higher current rating than 10 AWG wire.
B Number 12 AWG wire at 25°C has more resistance per 1000 ft than 10 AWG wire at 25°C.
C Number 10 AWG wire has a higher dielectric strength
than 12 AWG wire.
D Number 12 AWG wire is larger than number 10 AWG
wire.

B Number 12 AWG wire at 25°C has more resistance per 1000 ft than 10 AWG
wire at 25°C.

4

A conductor with a cross-sectional area of one circular mil would have a diameter of __________.

0.001 inches

5

Which of the following materials is a good electrical insulator?
A wood
B silver
C copper
D gold

A wood

6

A common type of protective covering used on electrical
conductors is __________.

rubber or plastic

7

Which of the following statements best describes the material known as varnished cambric?

Cotton cloth coated with insulating varnish.

8

Which of the listed classes of electrical insulation is suited for the highest operating temperature?

Class 180 (H)

9

Most conducting materials such as copper, aluminum,
iron, nickel, and tungsten __________.

increase in resistance with
increased temperature

10

The reason some electric cables are formed of stranded wire is to __________.

increase their flexibility

11

Which of the following characteristics is most critical in determining the size of the cable to be used in a particular circuit?

current rating

12

The existing resistance of a conductor is dependent
upon its length, cross-sectional area, __________.

material and temperature

13

Electrical wire in general, when used aboard vessels
must meet minimum requirements. Which of the
following statements is/are correct?
A Each wire must be 14 AWG or larger, regardless of locations and use.
B Wire must be copper stranded.
C The only wire that does not have to be in a suitable
enclosure or cover is the ground wire used with portable tools and lights.
D All of the above.

B Wire must be copper stranded.

14

The resistance of a conductor varies __________.

directly as its length and inversely as its cross-sectional area

15

The resistance of electric wire will decrease as its
__________.

cross-sectional area increases

16

When the current flow through a copper wire increases, its __________.

temperature will increase

17

A wire is being used as a replacement having twice the
length and one-half the cross-sectional area of the
original wire. The resistance of this new wire, when
compared to that of the original wire, is __________.

four times as great

18

The proper way to apply plastic electrical tape to an
electric cable splice is to __________.

wind the tape so that each turn overlaps the turn before it

19

Which of the following statements concerning copper wire sized by AWG numbers is correct?

Number 12 AWG wire at 25°C has more resistance per 1000 ft than 10 AWG wire at 25°C.

20

The heating of conductors as a result of resistance in a
distribution circuit causes a power loss expressed as
__________.

line loss