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C7 test > C7 test > Flashcards

C7 test Flashcards

1
Q

The grounding conductor for a community antenna TV( CATV or cable) system must be no smaller that_______ solid stranded copper or other corrosion resistance conductive material.

A

No 14

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2
Q

CATV grounding conductor

A

the grounding of the electrode system of the building or structure

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3
Q

indoor antennas and indoor lar-ins must be run no closer than____to conductors of other wiring systems in the premises

A

2 inches

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4
Q

lead-in conductors on the outside of a building must be run so they can swing no closer than blank to the conductors of circuits of 250 volts or less

A

2 feet

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5
Q

lead-in conductors on the outside of a building must be run so they can swing no closer than blank to the conductors of circuits of more than 250 volts

A

10 feet

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6
Q

outdoor antennnas and lead in conductors must not cross over open light or power conductors. When closeness to such conductors (less thatn 250 V) cannont be avoided, the NEC requires that the clearance must be a least

A

2 feet

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7
Q

the correct sequence that a satellite signal follows a dish antenna is

A

feedhorn, low-noise amplifier, downconverter, receiver, television set

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8
Q

the downconverter in a satelite antenda system passes on the signal to the

A

receiver

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9
Q

the downconverter

A

converts signals from high frequency to low frequency

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10
Q

while trenching near an underground CATV cable, you inadvertently damage the cable. you should immedialty contact the cable company becuase

A

radiating signals from the damaged cable can inerfere with aircraft transmissions

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11
Q

in four-wire telephone cable, the wire colors are usually

A

black,green, red and yellow

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12
Q

in a four wire telephone cable, the red and green wires carry

A

the message, 48 v dc and 85 v ac signals

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13
Q

in a four-wire telphone cable, the yellow wire

A

can be used as a ground wire

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14
Q

which two wires are sometime used as a second line

A

yellow and black

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15
Q

in the primary wiring pair, which is the ring wire

A

green

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16
Q

in the primary wiring pair, which is the ring wire

A

red

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17
Q

in six-wire telephone cable, what are the additional two colors

A

white and blue

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18
Q

in the six wire telephone cable, what are the white and blue wires used for

A

functions such as speakerphones, dialers, background music, and security signals

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19
Q

no more than how many phones can be installed without overloading the incoming phone circuit

A

5

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20
Q

the point whre the phone company wiring ends and the owners interior wiring begins is called the

A

demarcation point

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21
Q

the most common interior phone wiring for a new home is

A

4 conductor no. 22 or 24

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22
Q

the recommended circuit length for number 22 phone cable is no more than

A

200 feet

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23
Q

phone jacks should be installed more than how many feet enter the home

A

200 feet

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24
Q

phone conductors should be kept how many feet from electrical branch-circuit wiring if the phone cable is run parallel to the branch circuit wiring,

A

12 inches

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25
Q

how far up should an intecom system be installed from the finished floor for the greatest operating

A

4 1/2 feet

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26
Q

the intercom system master station should be located at least how far from an adjacent wall, cabinets, or counters

A

4 inches

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27
Q

The standard installation height for inside phone jacks is

A

36”

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28
Q

which cable may not be run in the same cable

A

Class 1 circuits

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29
Q

the following conductors can’t be placed in any raceways, compartments, outlet box, junction box, or similar fitting with the conduction of

A

electric light circuit, electric power circuits, class one circuits

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30
Q

is a doorbell doesn’t work, the most likely source of failure is the

A

bell button

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31
Q

if you get 0 volts if a doorbell fails you conclude that the transformer is defective.

A

true

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32
Q

smoke detectors are powered by the following

A

black and white pigtails for direct connection to a 120 v line. a cord and plug connected to a standard receptacle and battery

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33
Q

which locations are best for a smoke detector

A

on the ceiling

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34
Q

the proper location for a heat or smoke detector installed in a room is

A

as close as possible to the center of the room

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35
Q

standard smoke detectors must be installed

A

outside each bedroom
in each addional story
in basements

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36
Q

in an unfinished attic, install a smoke detector

A

on the bottom edge of a rafter or joist

37
Q

smoke detectors installed in a basement must be located

A

close to the starway leading to the floor above

38
Q

smoke detectors in rooms with ceiling slopes greater than how many feet should a detector be located

A

1 foot rise to 8 foot run

39
Q

in a residential stairway install a smoke detector

A

at the top of any open stairway

40
Q

installed on a ceiling a heat or smoke detector edge must be installed no less than how far from a wall

A

4 inches

41
Q

if a smoke detector is installed on a wall the top edge must be installed how far from less than from the ceiling

A

4 inches

42
Q

if the smoke detector is installed on the wall the tip edge must be installed no more than how far from the ceiling

A

12 inches

43
Q

install a smoke detectror how far from a flouresenct light fixtures

A

6 feet

44
Q

never install a smoke detector in the following locations

A

garage
kitchen near the stove
bathroom with a shower

45
Q

the wiring of a smoke detector in new construction is usually done

A

in parallel

46
Q

the wiring of a security system usually consists of

A

multiconductor cables made up of no 18 AWG

47
Q

the installation of security system wiring should be done

A

after standard house wiring is installed

48
Q

the wiring of door entry, glass-break, floor matt, and window-foil detectors is usually done

A

in series

49
Q

the wiring of alarms, horns and other signaling devices is usually done

A

in parallel

50
Q

The supply source for a class 1 power-limited circuit has a rated output of no more than

A

30 volts and 1000 volt-amperes

51
Q

The supply source for a class 2 or Class 3 power-limited circuit has a rated output of no more than

A

30 volts and 100 volt-amperes

52
Q

when installing the low voltage cable in a remote control system, run the cable from the transformer to

A

the relay (blue-colored conductor) each switch postion( red and black conductor)

53
Q

the purpose of a master selector switch in a residential installation of a remote control system is

A

to activate or deactivate any of the low-voltage switches at remote locations

54
Q

the lead of the three low-voltage wires is common to both the off-coil and the on the coil

A

Blue

55
Q

the low voltage relay of a romote control system of the three low voltage wires connect internally to the on coil

A

red

56
Q

the low voltage relay of a romote control system of the three low voltage wires connect internally to the off coil

A

black

57
Q

what is the purpose of a thermal breaker in a low voltage remote control system

A

to open the primary circuit and protect the transformer for overheating

58
Q

low voltage remote control system use what type of conductors

A

No 18

59
Q

when are you likely to be reqired to get a building permit for outdoor wiring

A

for the GFCI recpticles that recieves a transformer

60
Q

you are installing a 12 V outdoor lighting system, but 120 v circuits operate a part of the 12 v system, and a GFCI must be installed. What should you do

A

check with the building inspector to see if you need a permit and check the local codes to see if they have any requirements for low voltage system installation

61
Q

a contractor is installing outdoor lighting for a lawn by running cable in a trench. If a concrete walkway is encountered, the preferred option is to

A

run the cable through a sleeve of pipe under the walkway

62
Q

the most likely source for failure in a low voltage circuit is

A

switch

63
Q

type CM (communication cable) need not be installed in a one or two-family dwelling if the following is used instead

A

Type CMX less than 1/3 in diameter

64
Q

why do hacksaw teeth face forward

A

you cut on the down-stroke

65
Q

what should you do first when testing a transformer with a megger

A

make sure that the switches or circuits of both sides are open

66
Q

a master selector switch is best described a

A

many swiches on one panel

67
Q

what part of a satelite system changes the frequency of signals

A

downlink converter

68
Q

the proper procedure when using a stepladder is

A

make sure the locks are engages

69
Q

in the primary wiring pair of a telephone system, whis is the postitive conductor

A

Green

70
Q

in the primary wiring pair of a telephone system which is the negative conductor

A

Red

71
Q

You are testing a phone system after the installation. You hear a dial tone and dial a number. You continue to hear a dial tone. What is the problem

A

the red and green wires were reveresed

72
Q

WATS stand for

A

Wide area telephone service

73
Q

the bottom of an outlet for a wall phone is typically insalled

A

56 “ above the floor

74
Q

equipment with exposed parts charge with over 50 volts must be

A

fenced off

75
Q

For a 24 volt circuit what is the allowable ampacity for a standed AWG N0 16 conductor

A

18 amps

76
Q

what type of function reads from right to left on a meter

A

resistance

77
Q

what is the most econmical way to dig a short trench

A

a trencher

78
Q

if you have installed a string of 12 v outdoor lights and they dim toward the end of the string, what is the most likely cause of the dimming

A

voltage drop

79
Q

if you have installed a string of 12 V outdoor lights and one of the fixtures is extinquised what is the most likley cause

A

faulty lamp

80
Q

if a workers are exposed to cuts, burns or corrosed or irritating substances, the employer must provide

A

hand protection

81
Q

employees exposed to flying or falling objects and/or electric shock or electric burns must wear

A

head protection

82
Q

at a construction site hard hand must me worn

A

by everyone

83
Q

what is the amount of Asbesotos that need to be reported by dosh if it is found in Dust

A

0.1%

84
Q

Asbestos at a jobsite should be handled

A

Wet

85
Q

CAL/OSHA inspectors will arrive at you office or jobsite

A

without an appoitment

86
Q

Which of the following is not a type of CAL/Osha citation

A

Judical

87
Q

in which of the following is a GFCI required by the NEC

A

Bathroom

88
Q

all 124-volt single phase and 20 amp receptacles installed with how many feet of a residential kitchen sink and servicing a countertop be equipped with a GFCI

A

6 feet

89
Q

What needs to be on every Jobsite

A

First Aid kits

C7 test (4 decks)

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