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CA Contractors Prep > C-10 Trade 1 > Flashcards

C-10 Trade 1 Flashcards

1
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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2
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

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3
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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3
Q

A service with No. 3/0 copper conductors requires a _____ grounding electrode conductor.

a. No. 2
b. No. 4
c. No. 6
d. No. 8

A

b. No. 4

NEC T250.66

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4
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%

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5
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

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6
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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7
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

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8
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”

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9
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

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10
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 NEC?

a. 50 amps
b. 60 amps
c. 70 amps
d. 90 amps

A

a. 50 amps

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11
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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12
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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13
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

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14
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

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15
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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16
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%

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16
Q

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

a. EMT
b. rigid and intermediate
c. flexible
d. PVC

A

b. rigid and intermediate

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16
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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16
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

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16
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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16
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

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16
Q

According to the NEC, 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. 1-½ watts
b. 2 watts
c. 2-½ watts
d. 3 watts

A

b. 2 watts

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17
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

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18
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

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19
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

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20
Q

The best raceway for underground installations is:

a. EMT
b. galvanized pipe
c. PVC
d. flexible

A

c. PVC

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21
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

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22
Q

Solve for “I” (current) given the information in the transformer drawing shown.

a. 20 amps
b. 80 amps
c. 120 amps
d. 200 amps

A

d. 200 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

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23
Q

The intensity of current is measured in:

a. amperes
b. ohms
c. volts
d. coulombs

A

a. amperes

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25
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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26
Q

The minimum wire space for bending 4/0 cable in a panel is:

a. 4”
b. 6”
c. 8”
d. 10”

A

c. 8”

27
Q

The NEC applies to which one of the following?

a. parking lots
b. ships
c. railroad yards
d. mobile homes

A

d. mobile homes

28
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

29
Q

There is a code violation in the drawing. What is the correct minimum depth for direct-burial cable installed as shown?

a. 6”
b. 12”
c. 18”
d. 24”

A

c. 18”

30
Q

This drawing shows two ground rods installed in soil. Does any part of this drawing indicate a code violation?

a. the trench should be 3’ deep
b. the angle should not exceed 45°
c. rods should be 8’ in length
d. there is no code violation

A

b. the angle should not exceed 45°

31
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

31
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

32
Q

Treat all burns with:

a. cool water
b. milk
c. baking soda
d. ointments or salves

A

a. cool water

33
Q

What does this electrical symbol represent?

a. resistor
b. battery
c. coil
d. fuse

A

a. resistor

34
Q

What does this electrical symbol represent?

a. capacitor
b. ground
c. rectifier
d. transformer

A

a. capacitor

35
Q

What does this electrical symbol represent?

a. fuse
b. coil
c. ground
d. rectifier

A

c. ground

36
Q

What does this electrical symbol represent?

a. amplifier
b. piezoelectric crystal unit
c. phase shifter network
d. pool-type-cathode power rectifier

A

d. pool-type-cathode power rectifier

37
Q

What does this electrical symbol represent?

a. resistor
b. battery
c. coil
d. fuse

A

b. battery

39
Q

What does this electrical symbol represent?

a. resistor
b. coil
c. rectifier
d. fuse

A

d. fuse

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

What is the largest size EMT allowed by the NEC?

a. ½”
b. ¾”
c. 3”
d. 4”

A

d. 4”

43
Q

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

a. 34’
b. 44’
c. 48’
d. 50’

A

b. 44’

44
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

45
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

46
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

47
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

48
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

49
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

51
Q

What is the total resistance of the circuit?

a. 60 ohms
b. 80 ohms
c. 110 ohms
d. 120 ohms

A

b. 80 ohms

52
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

53
Q

What is the ratio of input voltage to output voltage in the drawing?

a. 4 to 1
b. 5 to 1
c. 10 to 1
d. 20 to 1

A

a. 4 to 1

54
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

55
Q

What type of facility does the diagram depict?

a. hospital
b. filling station
c. theater
d. residential custodial care facility

A

a. hospital

57
Q

What type of facility does the diagram depict?

a. textile mill
b. filling station
c. theater
d. small hospital or care facility

A

d. small hospital or care facility

58
Q

What type of switch does this symbol represent?

a. single-pole, single-throw
b. single-pole, double-throw
c. double-pole, single-throw
d. double-pole, double-throw

A

a. single-pole, single-throw

59
Q

What type of switch does this symbol represent?

a. single-pole, single-throw
b. single-pole, double-throw
c. double-pole, single-throw
d. double-pole, double-throw

A

c. double-pole, single-throw

60
Q

What type of switch does this symbol represent?

a. single-pole, single-throw
b. single-pole, double-throw
c. double-pole, single-throw
d. double-pole, double-throw

A

b. single-pole, double-throw

61
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

62
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.

64
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)

65
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

NEC T310.15(b)(2)(a)

66
Q

Where do you bond the service entrance cable?

a. ground
b. electrode
c. bar
d. metal enclosure

A

d. metal enclosure

67
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

69
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

70
Q

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

a. EMT
b. PVC
c. AC
d. aluminum

A

b. PVC

71
Q

Which of the following cannot be installed in a wireway?

a. busbar
b. conductors
c. switches
d. all of the above

A

c. switches

72
Q

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

a. black
b. white
c. red
d. green

A

d. green

73
Q

Which of the following is an 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

74
Q

Which of the following is not moisture-resistant?

a. THWN
b. THW
c. RHW
d. BXT

A

d. BXT

76
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

77
Q

Which of the following measures true power?

a. ohmmeter
b. wattmeter
c. Megger
d. none of the above

A

b. wattmeter

78
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

79
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

80
Q

Which of the panelboards shown is best suited for use as service equipment?

a. A
b. B
c. C
d. none of the above

A

a. A

81
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

CA Contractors Prep (6 decks)

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