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PRACTICE EXAM 2008 > PRACTICE EXAM > Flashcards

PRACTICE EXAM Flashcards

1
Q

An electrical appliance is rated at 1,500 watts, and is connected to 120 volts. What is the resistance associated with the appliance?

A

9.6 ohms

I = P/E

I= 1500/120

I = 12.5 Amps

R = E/I

R = 120/12.5

R = 9.6 Ohms

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2
Q

What is an askarel?

A

A group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media.

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3
Q

Approximately how many kilowatts are used by a three-phase, 480-volt AC motor that draws a current of 52 amperes and has a power factor rating of 88%?

A

38,043 watts

or 38kW

P = 1.732 * 480 * 52 * .88 = 38,043 Watts

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4
Q

One horsepower is equal to how many watts?

A

746 watts

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5
Q

A resistor has the following color bands (in order) : orange, red, brown, silver. What is the resistor value?

A

320 Ohms (10% tolerance)

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6
Q

What is the greatest root-mean-square (effective) difference of potential between any two conductorsk of a circuit defined as?

A

Voltage

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7
Q

An appliance draws 40 amperes when used on a circuit. A bad splice is discovered on the line at the appliance on one of the phase conductors. The splice has a measured resistance of 0.5 ohms. How much power is lost at the splice

A

800 watts

Power loss = I2 *R

P= (40*40) * .5

P = 1600 * .5

P = 800 Watts

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8
Q

A continuous load is a load whre the maximum current is expected to continue for at least how long?

A

3 Hours

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9
Q

Where metallic plugs or plates are used with nonmetallic enclosures, how far shall they be recessed from the outer surface of the enclosure?

A

1/4 inch

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10
Q

How far shall the work space extend from the grade, floor, or platform for equipment that is 60 inches in height?

A

6’ 6 “ = 78 inches

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11
Q

For other than a totally enclosed switchboard or switchgear, what is the minimum amount of space that shall be provided between the top of an unshielded switchboard or switchgear and any combustible ceiling?

A

3 feet or 36 inches

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12
Q

Where a feeder supplies conitnuous loads or any combination of continuous and non continuous loads, the minimum feeder conductor size shall have an allowable ampacity not less than the nonconitnous load plus what percentage of the conitnuous load?

A

125%

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13
Q

Where an electrical vault is required or specified for conductors and equipment operating at over 600 volts, nominal, the floor when in contact directly with earth shall be constructed in what manner?

A

6 inches of concrete

check answer?>

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14
Q

What clearance must be maintained when overhead spans of open conductors or open multiconductor cables of not over 1,000 volts, nominal, pass over residential property.

A

12 feet

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15
Q

Where the negative polarity of a DC system does not serve as the connection point for the grounded conductor, which color finish can be used to identify the negative ungrounded conductor?

A

Black

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16
Q

What is the recommended maximum total voltage drop on both feeders and branch circuits to the farthest outlet?

A

5%

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17
Q

What is the maximum voltage drop for any branch circuit, seperatley derived system, operating 120-volts line-to-line and 60 volts to ground, serving sensitive electronic equipment?

A

1.5%

check answer?.

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18
Q

Temporary electric power and lighting installations for holiday decorative lighting shall be permitted for a period not to exceed?

A

90 days

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19
Q

Which type of conduit is not permitted to be used to install underground service conductors?

A

FMC

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20
Q

The feeder conductor ampacity shall not be less than that of the service conductors where the feeder conductors carry the total load by service conductors with an ampacity of

A

55 amperes or less

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21
Q

Receptacles in residential units shall be installed that no space measured horizontally along the floor of any wall space is more than how far from a receptacle outlet?

A

6 feet

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22
Q

When the disconnecting means of a transformer is located remotely it must be

A

lockable

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23
Q

What must circuit breakers used as switches in high-intensity discharge lighting circuits be marked as?

A

HID

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24
Q

Which is best defined as an unintentional, electrically conductive connections between an ungrounded conductor of an electrical circuit and the normally non-current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or earth?

A

Ground Fault

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25
Q

What is the maximum permitted length of the branch-circuit wiring from the branch-circuit overcurrent device to the first outlet for a 12 AWG conductor with a listed outlet branch-circuit type arc-fault interrupter installted at the first outlet box?

A

70 feet

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26
Q

Resistance-type heating elements in electric space-heating equipment shall be protected at not more than how many amperes?

A

60 amperes

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27
Q

The service disconnecting means may be installed in all of the following excpet?

A

The Bathroom

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28
Q

What is the maximum overcurrent protection for a 10 AWG copper conductor?

A

30 amperes

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29
Q

A motor disconnecting means shall be permitted to be out of sight of the controller for motor ciruits over how many volts?

A

1000 volts, nominal

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30
Q

For permanently connected appliances, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means for appliances rated at not over?

A

300 volt-amps or 1/8 hp

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31
Q

Plug fuses shall be permitted to be used to in circuits supplied by a system having a grounded neutral point whre the line-to-neutral voltage does NOT exceed which of the following

A

150 volts

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32
Q

Where a main bonding jumper or a system bonding jumper is a screw only, the screw shall be identified with which color finish?

A

Green

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33
Q

A system that is connected to establish electrical conitnuity and conductivity is considered to be which of the following?

A

Bonded

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34
Q

High-impedance grounded neutral systems in which a grounding impedance limits the ground fault curretn to a low value shall be permitted for which type of system?

A

3- phase ac systems of 480 to 1000 volts

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35
Q

When an AC system is grounded at any point, the grounded conductors shall be routed with the ungrounded conductors to each service disconnecting means and shall be connected to each disconnecting means grounded conductors terminal or bus for an AC system operating at how many volts?

A

1000 volts or less

36
Q

The portion of a grounding electrode conductor in a DC system that is connected to a rod or pipe shall NOT be required to be larger than?

A

6 AWG

37
Q

Equipment grounding conductors of bare or insulated aluminum or copper-clad aluminum shall not be terminated within how many inches of the earth?

A

18 inches

38
Q

Individually covered or insulated equipment grounding conductors shall have a continuous outer finish that is either green or green with one or more

A

yellow stripes

39
Q

Alternating-current systems of less than 50-volts shall be grounded where supplied by transformers, if the transformer supply exceeds?

A

150-volts to ground

40
Q

If installed and routed on the outside of a raceway, the length of the equipment?

A

6 feet

41
Q

What is the minimum size of the aluminum equipment grounding conductor whre the overcurrent protection ahead of a branch circuit feed is sized 600 ampere

A

2/0 AWG

42
Q

Where are flat cable assemblies permitted to be installed?

A

in exposed locations

43
Q

Unless otherwise provided, MC cables shall be secured at intervals not exceeding which of the following?

A

6 feet

44
Q

In which application is the installation of NM cable permitted?

A

In type III construction

45
Q

Diregarding exceptions, conductors used for burial applications shall be shielded if rated above ?

A

2,000 volts

46
Q

Type MI conductors shall NOT be composed of which material?

A

Aluminum

47
Q

What is the maximum spacing for supports of 10 AWG conductors located in a vertical raceway?

A

100 feet

48
Q

Where is AC cable NOT permitted to be used?

A

In damp locations

49
Q

What is the minimum size copper conductor permitted for use for a 6,000 volt service?

A

6 AWG

50
Q

All of the following types of cable are permitted to be used as underground service conductors EXCEPT

A

Type AC

51
Q

Which type of service-entrance cable has a flame resistant and moisture covering?

A

Type SE

52
Q

When installed in the same cable tray, cables operating over 600 volts shall be of which type?

A

MC cable

53
Q

How many quarter bends are allowed in IMT between pull joints?

A

4 bends

54
Q

EMT shall be securely fastened in place at intervals NOT to exceed?

A

10 FEET

55
Q

The conductors, including splices and taps, shall not fill wireway to more than what percentage of its area?

A

75 percent

56
Q

Disregarding exceptions, liquidtight flexible metal conduit shall be supported and secured at intervals not to exceed

A

4 1/2 feet

57
Q

What is the maximum number of 12 AWG conductors that can be used in a 4” x 1-1/2 square box?

A

9

58
Q

The length of the pull box shall not be less than how many times the outside diamter, over sheath, of the largest shielded or lead covered conductor or cable entering the box?

A

48 times

59
Q

What is the minimum size solid conductor permitted to be installed in a raceway?

A

8 AWG

60
Q

A fitting is a part of a wiring system that is intended primarily to perform which type of function?

A

Mechanical

61
Q

what is the minimum radii for fixed bends of 1/2 inch flexible metallic tubing

A

4 inches

62
Q

For pool equipment, the disconnecting means for all ungrounded conductors shall be readily accesible and within sight from its equipment and shall be located a minimum of how many feet horizontally from the insdie walls of a pool?

A

5 feet

63
Q

A panelbord for a mobile home shall be rated not less than?

A

50 amperes

64
Q

What is the maximum distance that the emergency controls for an attended self-service fuel dispensing facility shall be located from the dispensers?

A

100 feet

65
Q

Assembly occupancies include portions of buildings or sturctures designed or intended for the gathering together of how many people?

A

100 or more

66
Q

What is the maximum weight of a luminaire that can be supported by the screw shell of a lampholder?

A

6 pounds

67
Q

Snap switches directly connected to aluminum conductors shall be listed and marked CO/ALR if rated at

A

20 amps or less

68
Q

Lamp tie wires, mounting screws, clips, and decorative bands on glass shall not be required to be grounded if spaced at least how far from the lamp terminals?

A

1 1/2 inches

69
Q

Signs and outline lighting system equipment for wet location use, other than listed watertight type, shall be weatherproof and have drain holes not larger than

A

1/2 inch

70
Q

Excluding exceptions, communications wires shall have a vertical clearance of not less than how many feet from all points of roofs above which they pass?

A

8 feet

71
Q

When combination surface metallic raceways are used for both signaling and for lighting and power circuits, the different systems shall be run in seperate compartments. Which is NOT an acceptable means of identifying by the interior finish of the different systems?

A

Tagging

72
Q

Receptacles used for circuits and equipment operating at less than 50 volts shall have a minimum rating of how many amperes?

A

15 amperes

73
Q

Unlisted nonconductive outside plant optical fiber cables shall not be permitted to be installed in which type of raceways?

A

FMC

74
Q

In a power-limited fire alarm circuit, transformers supplied from power-supply conductors shall be protected by an overcurrent device rated not over

A

20 amperes

75
Q

The storage batteries used as a source of power for emergency systems shall be or suitable rating and capacity to supply and maintain the total load for a minimum of how long?

A

90 minutes

76
Q

All employees must recieve training on working in confined and enclosed spaces when working in open pits that are greater than how many feet in depth?

A

4 feet

77
Q

Exit signs, when required, shall have lettering that is a minimum of how many inches high?

A

6 inches

78
Q

What is the permissible noise exposure limit for an 8-hour day that, if exceeded, requires hearing protection to be provided?

A

90dBA

79
Q

The base of a 24-foot non-self-supporting ladder shall be placed approximately how far from the vertical structure upon which is leaning?

A

6 feet

80
Q

A written emergency action plan is required for all employees with how many employees?

A

11 employees or more

81
Q

When intermediate members (such as balusters or additional rails) are used on scaffolding, they shall NOT be more than how many inches apart?

A

19 inches

82
Q

Where the rated input current of the autotransformer is less than 9 amperes, what is the maximum permitted overcurrent device rating?

A

167% of the input current

83
Q

A motor with a code letter of D shall have what range of kilowatt-ampres per horsepower with locked rotor?

A

4.00 to 4.49

84
Q

Use of a higer class motor overload relay may preclude the need for which of the following

A

selection of a higher trip current

85
Q

The ampacity of the conductors from the generator terminals to the first distribution devices containg overcurrent protection shall not be less than what percentage of the nameplate current rating?

A

115%

86
Q

Dry-type transformers rated over which voltage shall be installed in a vault?

A

35,000 volts

PRACTICE EXAM 2008 (1 decks)

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