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C7 test > C 7 > Flashcards

C 7 Flashcards

1
Q

what is used for electrical energy

A

Capacitor

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2
Q

what device would you use to locate underground cables or conduit

A

Electronic metal detector

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3
Q

before using a keyhole saw to install recessed ceiling light, what do you do

A

drill a hole large enough for the saw blade

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4
Q

for a security alarm, the most cost-effective way to detect an intruder breaking through a wall or ceiling it to install

A

vibration detectors

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5
Q

vibration detectors in an alarm system are best installed on

A

walls

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6
Q

vibration detractors in a alarm system should be installed _____above floor level and________apart

A

4-5 feet—–2-5-6 feet

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7
Q

the portion of a circuit that extends beyond the final overcurrent device is called the

A

branch circuit

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8
Q

a cable with two insulated conductors concentric to each other is called

A

coaxial

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9
Q

one cycle represents

A

360 degrees

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10
Q

another term for an inductor is a

A

coil

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11
Q

an ohm represents the amount of electrical resistance that allows current to flow at the rate of on_____under a pressure of one_______

A

resistor

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12
Q

splices in doorbell wiring

A

may be made at any point in the circuit

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13
Q

you must keep stereo-speaker wires at least____away from exposed power wiring

A

2 inches

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14
Q

a circuit that controls other circuits or parts there of through devices such as relays is called a

A

remote-control circuit

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15
Q

a circuit that enegizes devices designed to give visual or audible signals is a called a

A

signal circuit

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16
Q

for a remote-control circuit, a transformer usually steps down the 120-volt supply to a nominal

A

24 Volts

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17
Q

a basic telephone system, the connection between the building to the central office is know as the

A

local loop

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18
Q

the proper location for a telphone outlet intended for an office desk phone is

A

the same height as the power box( 14” above the floor)

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19
Q

in a typical satelite antnna system, the reciever is connected to the television by

A

75-ohm coaxial cable

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20
Q

in a phone system, REN refers to the Ringer Equivalence number. Five 1 Ren phone equal 5 RENS. Ten 1/2 REN phones equal

A

5 RENS

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21
Q

Wiring used to ground a phone company’s incoming cable sheath and protector is no small than_____ or its equivalent

A

No. 14 AWG copper

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22
Q

a motorized master control device can typically control up to

A

25 circuits

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23
Q

troubleshooting a 120-volt outdoor lighting system. One of the fixtures does not light. After replacing the bulb, what is the next step

A

turn off the power and check with the voltage tester to make sure its off

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24
Q

troubleshooting a 120 volts outdoor lighting system. One of the fixtures does not light. Which of the following may be the problem

A

the lamp socket contact is faulty
the junction box wiring at the fixture is faulty
the circuit breaker is tripped

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25
Q

how do you care for someone that that has been shocked and has been freed from the equiptment

A

check to see if the victim is still breathing and if there is a heartbeat. If not apply CPR

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26
Q

cables installed in building locations other than plenums or riser must be type CMG or TYPE CM. However, the NEC allows several exceptions for type CMX communications cable-less that____in diameter

A

.25”

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27
Q

in new constrution, smoke detectors are powered by

A

120- V ac circuit wiring

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28
Q

how should you care for a victim in a state of shock

A

keep victim lying down to improve circulation and reduce paing an call for emergency medical assitance

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29
Q

in which if the following locations may you not use rigid PVC as a conduit

A

in an HVAC duct

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30
Q

No. 18 copper conductors run in vertical raceways must be supported every____

A

100 ft

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31
Q

No. 16 copper conductors run in vertical raceways must be supported every____

A

100 ft

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32
Q

No. 0000 AWG copper conductors run in vertical raceways must be supported every____

A

80 feet

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33
Q

when would an electrican be likely to get the most use of an adjustible cresecent wrench

A

when installing and removing compression couplings on thinwall conduit

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34
Q

Nonmetalic wireways must be supported at least every

A

10 Ft

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35
Q

PVC conduit less than 1.25-inch nominal size must be supported at least every

A

3 ft

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36
Q

non-rigid metallic conduit must be supported at least every

A

10 ft

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37
Q

flexible metal conduit must be supported at least evey

A

4 1/2 feet

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38
Q

when installing the ground for a phone system, you should attach the ground to

A

a conductor system originally installed when the building was constructed.

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39
Q

a riser is

A

a vertical shaft that space two or more floors

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40
Q

Plenumn is

A

an air handling space where seveal ducts meet

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41
Q

where does a blue wire go in the low voltage system

A

to a relay

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42
Q

the primary battery of a smoke detector must

A

last one year before needing replacement

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43
Q

if any work is begun on the alarm panel of a cental station you must

A

restore the panel to normal opeartion as soon as possible

44
Q

if your are installing a step-down transformer in a low voltage remote control system, which connections are required to be inside an enclosure

A

only the high voltage (powering wiring) conections

45
Q

you insert telephone line tester into a wall jack so the number 2 is toward the stepped side of the jack. The red light goes on. That tells you

A

the polarity is reversed in Line 1

46
Q

you insert telephone line tester into a wall jack so the number 2 is toward the stepped side of the jack. The yellow light goes on. That tells you

A

there is AC pwer on the line

47
Q

sound sysem cables are allowed to fill a raceway to_____ of it capacity

A

75%

48
Q

A generator produces electricity by

A

electromagnic induction

49
Q

when using a keyhole saw you should use

A

very light pressure

50
Q

sabersaws are designed to cut on the

A

upstroke

51
Q

hacksaws are designed to cut on the

A

downstroke

52
Q

in which tasks does a hacksaw perform least well

A

cutting rigid metal conduit

53
Q

what would you generally use to Cut EMT

A

a hacksaw or a pipe cutter

54
Q

bending conduit is best done with a

A

field hickey

55
Q

why is a conduit bender the best tool to use to bend EMT

A

it keeps the interior volume of the pipe unchanged

56
Q

which would you use to clear or check conduit before pulling cable

A

mandrel

57
Q

what tool would you use to check that a pipe is adequately grounded

A

Megger

58
Q

a device has a resistance of 12 ohms and draws 3 amps. According to Ohms law, what voltage should be supplied

A

36 volts

59
Q

if a phone system is ringing on the main line, what is the color of the ring wire

A

red

60
Q

for low voltage wiring, use rigid metal conduit to go through______for fire protection

A

concrete walls

61
Q

you must use conduit when running wiring through

A

cement

62
Q

what tool would you use to notch wooden studs, floor joints, etc for the passage of conduit

A

wood chiesel

63
Q

what is the most practical alternative for running conductors between floors of an existing building

A

conduit

64
Q

for a chime/bell system in a residence, it is standard practice to install

A

one pushbutton at each door

65
Q

when measuring conduit for two 90 degree bends, you should

A

add the back-to back overshoot to the desired lenght

66
Q

when designing a drawing a low voltage system

A

draw on new plans

67
Q

what is the proper way to store tools at a job site

A

power-acutated tools must be kept in a locked container whenever unattened

68
Q

why is cooper better that silver for electrical wiring

A

cheaper

69
Q

the correct way to install wire-nuts is

A

strip ends the length of the wire-nut, twist tightly clockwise, use cutters to trim the ends even, then twist on the wire nut hand tight

70
Q

the safety disconnect switch for a motorized equiptment must be located

A

within 50 feet of the motor and driven equipment

71
Q

what is the the correct way to use a roto-or hammer drill

A

fast speed with as much presure as you can manage

72
Q

when insalling a fire alarm panel and other devices attached to the panel

A

all devices must be approved by the authority having jurisdiction or listed for use with the panel

73
Q

what type of switch is normally used to control a remote control relay

A

single pole, double throw (SPDT)

74
Q

what material would you drill with a standard high speed steel drill bit

A

sheet metal

75
Q

what material should you never drill with a standard high-speed steel drill bit

A

masonry

76
Q

what migh you use to cut flexible metal conduit or liguidtight flex

A

a hacksaw

77
Q

what sesimic zones are in CA

A

3&4

78
Q

what is the min heigh if a guardrail

A

42 inches

79
Q

how do you tell the difference between 568A cables and 568B

A

the pairs of wires are arranged differently

80
Q

Conductor length and conductor size are both proportionally related to

A

resistance

81
Q

what type of low voltage cable is required for use in a ceiling used for air-handling

A

plenum-rated cable

82
Q

what are the general wiring requirements for a 70-volt background-music sound system

A

one pair of No 22 AWG

83
Q

what does LAN stand for

A

Local Area Network

84
Q

in a local antenna system, everthing after channel 14 and up is called

A

UHF

85
Q

when do yo use singlemode fiber

A

Long distance

86
Q

how do you test a short

A

ohmmeter

87
Q

what is the most common size of fiber optic cable

A

62.5/125

88
Q

what type of light pulses travel in multimode fiber optic cables

A

both high and low order

89
Q

what type of light pules travel in singlemode fiber optic cables

A

low order only

90
Q

how do you first test fiber

A

HeNe or LED laser

91
Q

which is the most common type of cable for Data

A

CAT 5

92
Q

which connector is the most commonly used for data processing

A

RJ45

93
Q

how many wires does a typical 66-block hold

A

100

94
Q

two techs are installing a data cable on one end. You connect the tracer at the office and the other at the block, but you do not get a signal. What should you conclude

A

you used the wrong cable

95
Q

how do you measure the lenght of fiber on a spool

A

OTDR

96
Q

which type of ladder should be used inside a buiding

A

wooden ladder

97
Q

how far must the side rails of ladders exend above a landing

A

36 inches

98
Q

what section of the NEC covers optical fiber

A

770

99
Q

which of the following standards covers fire alarms

A

NFPA 72

100
Q

what is the min diameter threaded rod you can use to suspend cable trays

A

3/8

101
Q

what color are 568SC connectors and adapters for multimode fiber

A

beige

102
Q

what color are 568SC connectors and adapter for singlemode fiber

A

blue

103
Q

what tool is used to terminate 25-pair Amphenol plug

A

butterfly tool

104
Q

what is the name of the outer covering for fiber optic cables

A

jacket

105
Q

how many quarter bends are allowed in a single run of conduit

A

4

106
Q

what do ladder color codes indicate

A

the maximun load

107
Q

bridge clips are use

A

to bridge two sides of a parallel-connected 66m150 block

C7 test (4 decks)

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