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Test 2 Flashcards

0
Q

The minimum required clearance from overhead high-voltage (600-50,000 V) conductors for boom-type lifting or hoisting equipment being dismantled is:

A. 4'
B. 6'
C. 7.5'
D. 10'
A

D. 10’

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1
Q

The minimum required clearance from overhead high-voltage (600-50,000 V) conductors for boom-type lifting and hoisting equipment in transit is:

A. 4'
B. 6'
C. 7.5'
D. 10'
A

B. 6’

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2
Q

When do the required clearances from overhead high-voltage conductors not apply?

A. when the overhead lines are on private property
B. when the power company installs the lines
C. when the overhead electrical distribution and transmission lines have been de-energized and visibly grounded.
D. when the power lines are in a wooded area
A

C. when the overhead electrical distribution and transmission lines have been de-energized and visibly grounded.

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3
Q

How often should the boom-angle indicator on a crane be inspected?

A. every day
B. every week
C. every month
D. every year
A

A. every day

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4
Q

What is the minimum distance a metal ladder should be from exposed energized electrical parts?

A. do not use a metal ladder
B. 4'
C. 6'
D. 10'
A

A. do not use a metal ladder

Non-metal ladders should be kept 6’ away.

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5
Q

What is the longest length ladder approved by Cal/OSHA?

A. 34'
B. 44'
C. 48'
D. 50'
A

B. 44’

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6
Q

How often should a fire extinguisher be maintained and tested?

A. every 6 months
B. every year
C. every 18 months
D. every 2 years
A

B. every year

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7
Q

If a person is electrocuted, the most likely appropriate response is to:

A. administer CPR
B. give a lumbar massage
C. administer Heimlich maneuver
D. attempt to get the victim to drink water
A

A. administer CPR

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8
Q

Where must you provide a disconnecting means in circuits of any voltage?

A. on the supply side of cartridge fuses
B. at the service drop
C. within 10 feet of the panel
D. a disconnecting means is not required
A

A. on the supply side of cartridge fuses

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9
Q

Which of the following colors may not be used for current-carrying wires?

A. black
B. white
C. red
D. green
A

D. green

Green = ground

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10
Q

Which of the following types of conductors may be used as an overhead feeder to a garage?

A. THHN
B. THWN
C. MTW
D. UF
A

B. THWN

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11
Q

Treat all burns with:

A. cool water
B. milk
C. baking soda
D. ointments or salves
A

A. cool water

A gentle flow of cool water: Too forceful a flow will cause damage to the burned tissue.

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12
Q

The symptoms of shock are:

A. cool, sweaty, pale, and bluish skin
B. rapid and weak pulse and shallow breathing
C. nausea, vomiting, and dizziness
D. all of the above
A

D. all of the above

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13
Q

For a 125-amp main service panel, what size and how many wires would be connected to a 100-amp sub-panel?

A. three No. 4 Al
B. three No. 6 Cu
C. four No. 4 Al
D. four No. 2 Cu
A

D. four No. 2 Cu

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14
Q

Which of the following types of extinguishers is most effective on an electrical fire?

A. high-pressure water
B. sand
C. dry powder (carbon dioxide)
D. carbon tetrachloride
A

C. dry powder (carbon dioxide)

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15
Q

If current leads the voltage in an AC circuit, which of the following would be the most likely cause?

A. resistance 
B. inductive reactance
C. capacitive reactance
D. inductive capacitance
A

C. capacitive reactance

Capacitive reactance is another name for the opposition set up by a capacitor to AC or pulsating DC current. “Current leads the voltage” means that the peak of the current wave occurs before the peak of the voltage wave.

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16
Q

The ideal power factor is:

A. 0.0
B. 0.1
C. 1.0
D. 1.2
A

C. 1.0

A unity (1.0) power factor is achieved when the current and voltage are exactly in phase. That is, the peaks of current and voltage occur at the same time.

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17
Q

If current leads the voltage in an AC circuit, which of the following would be the most likely cause?

A. resistance 
B. inductive reactance
C. capacitive reactance
D. inductive capacitance
A

C. capacitive reactance

Capacitive reactance is another name for the opposition set up by a capacitor to AC or pulsating DC current. “Current leads the voltage” means that the peak of the current wave occurs before the peak of the voltage wave.

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18
Q

If current lags behind the voltage in an AC circuit, which of the following would be the most likely cause?

A. resistance
B. inductive reactance
C. capacitive reactance
D. conductive reactance
A

B. inductive reactance

Inductive reactance is the opposition set up by an inductor to the flow of AC or pulsating DC current. “Current lags behind the voltage” means that the peak of the current wave occurs after the peak of the voltage wave.

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19
Q

Given a circuit with equal inductive reactance and capacitive reactance, what happens when you modify either reactance?

A. inductance increases
B. inductance decreases
C. power factor increases
D. power factor decreases
A

D. power factor decreases

Inductive and capacitive reactance act in opposition to keep a circuit in phase–i.e., to balance out current lag and current lead. If one type of reactance is changed in a balanced circuit, the power factor will decrease because the circuit will become out-of-phase.

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20
Q

In an inductive reactance circuit, adding capacitive reactance will:

A. decrease power factor
B. decrease efficiency
C. increase true power
D. increase apparent power
A

C. increase true power

If capacitive reactance is added to an inductive reactance circuit, the circuit will come more into phase, which will increase the power factor. If the power factor increases, then true power will increase relative to apparent power.

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21
Q

In a circuit less than 50 volts, the minimum size receptacle for a hand-held 4-volt lamp is:

A. 10 amps
B. 15 amps
C. 20 amps
D. 30 amps
A

B. 15 amps

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22
Q

The amperage rating for No. 6 RH cable at 20°C ambient is:

A. 55 amps
B. 65 amps
C. 70 amps
D. 85 amps
A

B. 65 amps

At up to 30°C ambient temperature, No. 6 RH cable is rated at 65A. The ampacity increases as temperature decreases, and at 20°C the wire is technically rated at 68.25A. However, since this was not offered as an answer choice, 65A is the best option.

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23
Q

How do you connect electrical cable to a box?

A. electrical connectors
B. set screws
C. electrical tape
D. fish tape
A

A. electrical connectors

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24
Q

What is the minimum recommended temperature for operating fluorescent lighting?

A. 30°F
B. 40°F
C. 50°F
D. 60°F
A

C. 50°F

Most fluorescent lights have a recommended minimum ambient temperature of 50˚F, and a maximum of 122˚F.

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25
Q

If there is 12’ of NMC between two boxes, how far from each box should it be supported?

A. 1'
B. 1-1/2'
C. 2'
D. 3'
A

A. 1’

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26
Q

If you want to enter a manhole, how do you properly test for gas?

A. smell the air
B. call the utility company
C. use a "sniffer"
D. light a match
A

C. use a “sniffer”

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27
Q

Romex must be protected by guard strips within _____ of an attic access hole without a permanent stairway or ladder.

A. 2'
B. 4'
C. 6'
D. 8'
A

C. 6’

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28
Q

Grounding rods should:

A. be placed at least 6' apart
B. be grounded with No. 4 wire
C. have a nonconductive coating
D. not be used
A

A. be placed at least 6’ apart

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29
Q

A single rod, pipe, or plate electrode with a resistance of more than ___ must have an additional ground electrode.

A. 10 ohms
B. 25 ohms
C. 60 ohms
D. 100 ohms
A

B. 25 ohms

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30
Q

Which of the following is a Ufer ground?

A. a rod electrode
B. a copper grounding electrode encased in the bottom 3" of a concrete footing
C. a metal water-pipe electrode
D. a driven ground
A

B. a copper grounding electrode encased in the bottom 3” of a concrete footing

“Ufer” grounds are named after their inventor, Herbert Ufer. Mr. Ufer invented the original method of using conductors embedded in concrete as a grounding system while working for the U.S. Army during WWII.

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31
Q

Where do you bond the service entrance cable?

A. ground
B. electrode
C. bar
D. metal enclosure
A

D. metal enclosure

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32
Q

The maximum operating temperature for THW insulation is:

A. 60°C
B. 75°C
C. 90°C
D. 110°C
A

B. 75°C

It’s 75°C for dry or wet locations and 90°C only for special applications within electric-discharge lighting equipment.

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33
Q

What size fuse should you use for three No. 6 THWN aluminum wires in a raceway at 30°C ambient temperature?

A. 40 amps
B. 50 amps
C. 60 amps
D. 70 amps
A

B. 50 amps

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34
Q

If you have three No. 6 THWN aluminum wires in a raceway at 30°C ambient temperature, what is the maximum amperage allowed by the Electrical Code?

A. 50 amps
B. 60 amps
C. 70 amps
D. 90 amps
A

A. 50 amps

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35
Q

What is the minimum size wire you may use to connect a 6kW range?

A. No. 4
B. No. 6
C. No. 8
D. No. 10
A

D. No. 10

6kW = 6000vA ÷ 240v = 25A.
Allowable ampacity of No. 10 TW copper conductor (assumed) is 30A.

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36
Q

The intensity of current is measured in:

A. amperes
B. ohms
C. volts
D. coulombs
A

A. amperes

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37
Q

A switch must be rated a minimum of _____ of the capacitor it serves.

A. 80%
B. 110%
C. 135%
D. 150%
A

C. 135%

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38
Q

A thermomagnetic overload device in a set of feeders should be sized at _____ of the rated current.

A. 100%
B. 115%
C. 125%
D. 140%
A

C. 125%

39
Q

A service with No. 000 copper conductors requires a _____ grounding electrode conductor.

A. No. 2
B. No. 4
C. No. 6
D. No. 8
A

B. No. 4

40
Q

Solid-core wire installed in raceways must be smaller than:

A. No. 2
B. No. 4
C. No. 6
D. No. 8
A

D. No. 8

41
Q

What is not a proper way to perform a safety inspection on rubber gloves?

A. fill with water and check for leaks
B. look between fingers for cracks
C. roll the gloves and create air pockets
D. rub and check for abrasions
A

A. fill with water and check for leaks

42
Q

How often should you inspect rubber gloves?

A. every day
B. every 3 days
C. every 6 months
D. every year
A

A. every day

43
Q

How often should you inspect rubber gloves?

A. every day
B. every 3 days
C. every 6 months
D. every year
A

How often should you inspect rubber gloves?

A. every day
B. every 3 days
C. every 6 months
D. every year
44
Q

Flat conductor cable (Type FCC) is used in branch circuits designed for installation under:

A. linoleum
B. asbestos tile floors
C. carpet squares
D. parquet floors
A

C. carpet squares

45
Q

What is the fire hazard in a Class II location?

A. explosive gas
B. combustible dust
C. textile fibers
D. wood shavings
A

B. combustible dust

46
Q

You are asked to install the wiring in a new 7000 sq ft home. What will be the main cost consideration?

A. 480-volt transformer
B. high cost of lights
C. owner changes
D. 1000-amp service
A

B. high cost of lights

47
Q

What is the rating of No. 14 THWN?

A. 30 amps
B. 25 amps
C. 20 amps
D. 15 amps
A

D. 15 amps

48
Q

What is the largest size EMT allowed by the Electrical Code?

A. 1/2"
B. 3/4"
C. 3"
D. 4"
A

D. 4”

49
Q

The minimum wire space for bending No. 0000 cable in a panel is:

A. 4"
B. 6"
C. 8"
D. 10"
A

C. 8”

Conductors must be bent to a radius at least 8 times the diameter for non-shielded cable, or 12 times the diameter for shielded or lead-covered cable. If No. 0000 cable is shielded, as it probably would be, its diameter is 0.618 to 0.785” (average is 0.680”).

Since 0.680” x 12 = 8.16”, “C” is the closest answer.

50
Q

Which of the following may not be installed in a wireway?

A. busbar
B. conductors
C. switches
D. all of the above
A

C. switches

51
Q

Which of the following is not moisture-resistant?

A. THWN
B. THW
C. RHW
D. BXT
A

D. BXT

All but BXT have “W” (“wet”) in their insulation code.

52
Q

Other than green, what color conductor can you use for equipment grounding?

A. bare
B. yellow with green stripe
C. white
D. black
A

A. bare

Covered equipment grounding conductors may be green or green with one or more yellow stripes.

53
Q

Liquid-tight flexible metal conduit should not be used in locations where it will be exposed to:

A. mineral oil
B. gasoline or similar solvents
C. water
D. weather
A

B. gasoline or similar solvents

54
Q

The term “askarel” refers to:

A. devices used to connect wires
B. bonding, conductive materials
C. electrical insulating media
D. ground clips
A

C. electrical insulating media

55
Q

A storage-type water heater with a capacity rating of 100 gallons should have a minimum branch circuit rating of:

A. 100%
B. 115%
C. 125%
D. 140%
A

C. 125%

Heaters with capacities of 120 gallons or less have a circuit rating of not less than 125% of the name plate rating of the water heater.

56
Q

A wattmeter must be connected to the source and load circuit:

A. in series
B. in parallel
C. in both series and parallel
D. in series or parallel depending on the frequency of the power source
A

C. in both series and parallel

57
Q

A fixture may be used as a raceway if:

A. it is designed for end-to-end installation
B. it is 18" away from any combustible material
C. it is well ventilated
D. it is nonmetallic
A

A. it is designed for end-to-end installation

58
Q

Recessed incandescent light fixture enclosures installed in insulated ceilings must be:

A. double-walled
B. self-cooling
C. 1/2" away from insulation
D. thermally protected
A

D. thermally protected

Enclosures must have 1/2” clearance from combustible materials, except at points of support, and 3” from insulation.

59
Q

When an ohmmeter is used:

A. an AC source must be connected to the circuit
B. a DC source must be connected to the circuit
C. a low-voltage source must be connected to the circuit
D. the circuit must be completely de-energized
A

D. the circuit must be completely de-energized

60
Q

The term “readily accessible” means:

A. automatic
B. not concealed
C. can be reached by ladder
D. able to be reached quickly
A

D. able to be reached quickly

“Readily accessible” also means that you would not have to climb over obstacles, remove obstacles, use a ladder, etc. “Accessible” means equipment can be approached closely, is not guarded by locked doors, and is not elevated or otherwise blocked from access.

61
Q

If a cable is installed under a 3” concrete pad, what is the minimum earth coverage required?

A. 6"
B. 12"
C. 18"
D. 24"
A

C. 18”

62
Q

Three No. 10 THW copper wires in conduit should have overcurrent protection no greater than:

A. 20 amps
B. 25 amps
C. 30 amps
D. 50 amps
A

C. 30 amps

63
Q

According to the Electrical Code, the minimum lighting load for a residence is 3 watts per sq ft. The minimum lighting load for a hospital is _____ per sq ft.

A. 1-1/2 watts
B. 2 watts
C. 2-1/2 watts
D. 3 watts
A

B. 2 watts

64
Q

According to the Electrical Code, the minimum lighting load for an office building is _____ per sq ft.

A. 3 watts
B. 3-1/2 watts
C. 6 watts
D. 8 watts
A

B. 3-1/2 watts

65
Q

The Electrical Code applies to which one of the following?

A. parking lots
B. ships
C. railroad yards
D. mobile homes
A

D. mobile homes

66
Q

The device used to increase the effective range of the ammeter is called a:

A. shunt 
B. series loop
C. galvanometer
D. coil
A

A. shunt

The State may say “universal shunt” instead. A shunt is a weak resistor connected in parallel to the meter’s movement.

67
Q

What is the ampacity of No. 8 THW copper wire?

A. 55 amps
B. 50 amps
C. 45 amps
D. 40 amps
A

B. 50 amps

68
Q

No. 4 THW aluminum wire is rated at:

A. 35 amps
B. 45 amps
C. 55 amps
D. 65 amps
A

D. 65 amps

69
Q

Type MI cable consists of one or more _______ conductors.

A. copper
B. aluminum
C. copper-clad aluminum
D. any of the above
A

A. copper

70
Q

Support EMT within ______ of a junction or outlet box.

A. 1 ft
B. 2 ft
C. 3 ft
D. 4 ft
A

C. 3 ft

71
Q

General lighting load in a building is based on:

A. lumens per foot-candle
B. watts per square foot
C. amps per square foot
D. volts per square foot
A

B. watts per square foot

72
Q

When you have more than 3 current-carrying conductors in a raceway or cable, you must de-rate the ampacity of the conductors. If you de-rate the ampacity 50%, what is the maximum number of conductors allowed in the raceway or cable?

A. 10
B. 20
C. 30
D. 45
A

B. 20

The ampacity of current-carrying conductors must be de-rated according to the number of conductors contained in the raceway or cable:

4-6 conductors: 80%
7-9 conductors: 70%
10-20 conductors: 50%
21-30 conductors: 45%
31-40 conductors: 40%
41+ conductors: 35%
73
Q

Conductors supplying outlets for professional motion-picture projectors must not be smaller than:

A. No. 8
B. No. 10
C. No. 12
D. No. 14
A

A. No. 8

74
Q

Which of the following would not be allowed as fixed wiring in a motion-picture theater?

A. mineral-insulated cable
B. metal-sheathed cable
C. Type MC cable
D. knob-and-tube wiring
A

D. knob-and-tube wiring

75
Q

The amperage rating for No. 2 THW is:

A. 85 amps
B. 100 amps
C. 115 amps
D. 130 amps
A

C. 115 amps

76
Q

The amperage rating for No. 12 THW is:

A. 15 amps
B. 20 amps
C. 25 amps
D. 30 amps
A

B. 20 amps

77
Q

Which conduit should you use in an area exposed to corrosive chemicals?

A. EMT
B. PVC
C. AC
D. aluminum
A

B. PVC

78
Q

Where may you not use rigid PVC?

A. direct burial underground
B. in cinder fill 
C. encased in concrete
D. in A/C ducts
A

D. in A/C ducts

79
Q

Which would you use to clear or check conduit before pulling wire?

A. mandrel
B. auger
C. Roto-Rooter
D. bore
A

A. mandrel

80
Q

What tool would you use to check that a pipe is grounded?

A. Megger 
B. Wiggy
C. ammeter
D. Ouija board
A

A. Megger

A Megger is a high-range ohmmeter with a built-in voltage source. It can be used for continuity, ground, and short-circuit testing in general electrical work.

81
Q

The overcurrent protection required for a compressor motor to protect it from a short-circuit current is selected on the basis of:

A. running current
B. locked-rotor current	
C. starting current 
D. combination-load current
A

A. running current

Overcurrent protection cannot be more than 175% of the motor-compressor rated-load current or branch-circuit rating, whichever is greater. A larger rating (up to 225% of the rated-load current or branch-circuit rating, whichever is greater) is permitted if the motor will not start. In other words, the overcurrent rating may be increased to allow for the starting current, but the maximum rating depends on the running current (or branch circuit).

82
Q

When using lugs on a conductor, which does not apply?

A. use right size die
B. use correct sleeve
C. properly prepare conductor
D. use compression washers on copper lugs (or connectors)
A

D. use compression washers on copper lugs (or connectors)

83
Q

The best raceway for underground installations is:

A. EMT 
B. galvanized pipe 
C. PVC
D. flexible
A

C. PVC

84
Q

Where would you use aluminum conductors?

A. corrosive areas
B. wet locations
C. food processing plants
D. none of the above
A

D. none of the above

85
Q

In Class I, Division 2 hazardous locations you may use the following kind(s) of conduit:

A. EMT
B. rigid and intermediate
C. flexible
D. PVC
A

B. rigid and intermediate

86
Q

What is the best tool for field-bending conduit larger than 1” in diameter?

A. EMT hickey
B. fixture hickey
C. conduit hickey
D. hydraulic bender
A

D. hydraulic bender

87
Q

Which of the following measures true power?

A. ohmmeter
B. wattmeter
C. Megger
D. none of the above
A

B. wattmeter

A wattmeter indicates true power under all conditions.

88
Q

What should you use if you don’t want to transmit vibration and noise?

A. flexible conduit
B. PVC
C. rigid metal conduit
D. EMT
A

A. flexible conduit

89
Q

A skirted receptacle is required for services over:

A. 150 V
B. 200 V
C. 300 V
D. 600 V
A

C. 300 V

90
Q

Electrical equipment must be encased and locked, except when observed by a qualified attendant, if it is more than:

A. 200 V
B. 400 V
C. 600 V
D. 1000 V
A

C. 600 V

91
Q

What is the minimum size ground conductor if the service is No. 1/0?

A. No. 8
B. No. 6
C. No. 4
D. No. 2
A

B. No. 6

92
Q

Rigid metal conduit is available from suppliers in lengths of:

A. 5'
B. 10'
C. 15'
D. 30'
A

B. 10’

93
Q

Which of the following trades must be completed before rough wiring is installed?

A. painting
B. drywall
C. framing
D. plumbing
A

C. framing

94
Q

In a residential bathroom, a GFI protected receptacle must be installed:

A. 12" above the floor
B. next to the mirror
C. next to the wash basin
D. in the shower stall
A

C. next to the wash basin

95
Q

Which of the following is required of the power circuit of a gasoline pump?

A. conduit must have an explosion-proof union and a seal
B. all conductors must have a switch or special circuit-breaker that will simultaneously disconnect all conductors, including the grounded neutral
C. there must be an emergency power cutoff at a location remote from the pump
D. all of the above
A

D. all of the above

96
Q

Every employer of _____ or more employees must keep safety records.

A. 5
B. 11
C. 16
D. 21
A

B. 11

That is, more than 10 employees.

C-10 (5 decks)

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