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D License > Electrical ? on D > Flashcards

Electrical ? on D Flashcards

1
Q

The minimum length for ground rod?

A

8ft

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2
Q

Handful of questions can be answered in the definition sections of NFPA 72 and NEC

A

Tip

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3
Q

There maybe a trick question that will . What kind of detector is needed for an elevator shaft that contains a sprinkler head with a certain heat rating. The answer is a heat detector that is lower rated than the sprinkler head

A

Tip

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4
Q

Ohms law states that current through a conductor between two points is directly proportional to the voltage across two points

A
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5
Q

How many hours are needed to renew you D licence every 3 years?

A

21 hours

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6
Q

Receptacles used for circuits and equipment operating at less than 50 volts. Shall be a minimum rating of how many amps.?

A

15 amps

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7
Q

Unlisted non conductive outside plant optical fiber cables shall not be permitted to be installed in which type of raceway.?

A

Flexible metal conduit

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8
Q

When a combination of surface metallic raceways are used for both signaling/ lighting and power circuits. The different systems shall be run in a separate compartment. When is it NOT an acceptance means of identifying by the interior finish of the different system.?

A

Tagging

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9
Q

The term faulty current is also called.?

A

Short circuit current

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10
Q

Speakers are “audible textual appliance”

A
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11
Q

Sound pressure is measured by using a.? –

A

A weighted scale

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12
Q

ADA became law in .?

A

1992

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13
Q

RMS is an effective value

A
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14
Q

What is the power at a 4 ohm resistance load connected to a 120v power supply.?

A

3600W

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15
Q

Askarel A group of nonflammable synthetic chlorinated hydrocarbons used a electrical industry Med kit

A
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16
Q

What is the greatest root-meen square(effective) difference of potential between any 2 conductors of a circuit concerned as.?

A

Voltage

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17
Q

Inverter turns DC into AC ,Rectifier turns AC into DC

A
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18
Q

ADA -Annex J

A
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19
Q

Reverse polarity on a ammeter will read zero

A
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20
Q

, Megameter tests for shorts to ground(insulated)

A
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21
Q

90 dba is permissible noise exposure for a limit of an 8 hr day. If exceeded hearing protection is required.

A

OSHA

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22
Q

4 ft is the depth of pits when working on a contained and enclosed spaces

A

OSHA

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23
Q

19 “ is the limit on intermediate members when on scaffolding.

A

OSHA

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24
Q

10 or less employees on an emergency action plan can be communicating orally any more would require a written plan.

A

OSHA

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25
Q

5000lbs is the minimum breaking strength for fall protection

A

OSHA

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26
Q

6 feet is the length a 24 ft non self-supporting ladder should be from the vertical structure upon which its leaning.

A

OSHA

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27
Q

What color does Digsafe use to flag electrical lines

A

Red

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28
Q

Pad locks (lock out/Tag out) must be assigned to 2 people T or F

A

False

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29
Q

What PPE is recommended when walking around energized circuits? ??

A
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30
Q

What is the amount of current considered to be lethal ?

A

.1 amp

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31
Q

What are the 3 factors that affect the level of injury from electric shock.?

A

Current, Path, Time

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32
Q

What is the proper 3 steps procedure for testing a circuit for voltage.?

A

Check known circuit, check circuit in question, check a live circuit.

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33
Q

What type of environment is characterized by” easily light able, fibers and flying’s

A

Class 3

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34
Q

Which symbol indicates that explanatory material on the paragraph can be found in Annex A?

A

Asterisk

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35
Q

Bored holes in wood members shall be kept at least how far from the nearest edge?

A

1 1/4 inches

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36
Q

What is the standard length of ridged conduit?

A

10 ft

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37
Q

Can Type NM cable be used as a wiring method in place of assembly?

A

No

334.12

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38
Q

Under what conditions can a plug and receptacle be used as a disconnecting means on a portable x-ray?

A

120 V 30 Amp

660.5

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39
Q

How long do you have to pass the D licence exam after being approved?

A

1 Year

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40
Q

What is the minumum fixed bend radius for 3/4 Flexible metal tubing (FMT)

A

5 inches

Table 360.24 (B)

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41
Q

A continuous load is when the maximum current is expected to continue for at least how many hours?

A

3 Hours

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42
Q

An existing 4 inch square box has knockouts open. What must be done to the openings?

A

Metal plugs must be used

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43
Q

The width of the work space in front of electric equipment that is 48” wide, shall be a minimum of ?

A

48 Inches

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44
Q

A single receptacle is placed on a individual 20 amp circuit. What is the minimum required rating for this receptacle?

A

20 Amps

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45
Q

The general lighting load for stores is?

A

3 VA square foot

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46
Q

What is the minimum height of the fencing around a high voltage switch yard is?

A

18 feet

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47
Q

The maximum number of service disconnects for a single service is?

A

6

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48
Q

In dwellings units,guest rooms of hotels and motels, over-current devices shall not be located in?

A

Bathrooms

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49
Q

Electrical equipment shall be installed in a neat and workman like manner. True or False

A

True

110.12

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50
Q

Where an attic space contains equipment that requires servicing such as an AC, where is the switch for the required lighting outlet to be located?

A

At the usual point of entry to the attic.

210.70 (3)

51
Q

310.16 (C) of NEC generally requires that conductors, where they are installed in raceways, shall be stranded when the conductor size is_____ or larger?

A

8 AWG

52
Q

The title of Article 310 of NEC is?

A

Conductors for General wiring

53
Q

According to 110.5 when the code refers only to a conductor size and the material of the conductor is not specified, the code intends the use of?

A

Copper wire

54
Q

Table 8 Chapter 9 of the NEC, “Conductor Properties” Ohm/1000 ft is

A

Ohms per one thousand feet

55
Q

How many strands of wire are used in the make up of 4/0 AWG stranded conductor?

A

19 strands

56
Q

Branch circuits supplying lighting fixtures in a dwelling units are limited to ____ volts normal between conductors

A

120V

210.6(A)

57
Q

A branch circuit that supplies two or more receptacles or outlets for lighting or appliances is known as a____ branch circuit?

A

General purpose

210.4

58
Q

The general rule for spacing of the required dwelling unit receptacles is that any space less than_____ feet does NOT require a receptacle outlet

A

6 Feet

210.52(A)(1)

59
Q

Which of the following wiring methods is NOT permitted to be used in interior wiring?

A

USE cable

338.12(B)

60
Q

A 120v GFCI protected 20 amp branch circuit is installed underground in Type UF cable. The cable passed under a one family dwelling driveway. The minimum burial depth for the UF cable is____inches?

A

12 inches

300.5 Table

61
Q

How many conditions does the NEC list whereby conductors shall be considered to be outside of a building or other structures?

A

6

225.30(A)

62
Q

What part of Article 230 addresses service exceeding 1000 volts normal?

A

Part IV pg 70-87

63
Q

When voltage goes up and resistance goes down what happens to current?

A

Current goes up

64
Q

How much space will one# 14 AWG and one #12 AWG take up in a box?

A

4,25 inch

314.16(B)

65
Q

The board has a right to know if the applicant has been

A

Convicted felon, misdemeanor or charged with a crime

66
Q

The frequency of inspection for a piece of equipment that requires semiannual inspections requires inspection the be

A

Between 4 to 8 months from the last inspection

67
Q

An insulated ground conductor may be identified by a continuous white or gray outer finish along its entire length if the conductor is ?

A

6 Awg or smaller

68
Q

What is the total resistance of a 50 ohm, a 75 ohm and 100 ohm resister in a series circuit?

A

225 OHMs

RT=R1+R2+R3… in series

69
Q

What is the total power of a parallel circuit with a 100v source 150 and 250 Ohms resisters?

A

106.67W

Look at Ohms law

70
Q

The voltage source of a 25V , what is the current through a 15 ohm resistor that is connected in parallel with a 30 and 45 ohm resistor?

A

.0833

Look at Ohms law

71
Q

If a voltage drop across a resistor is 20 v and the current is .02 A what is the power dissipated in watts?

A

.04

Look at Ohms law

72
Q

What is used to measure resistance?

A

Ohmmeter

73
Q

A resistor has color bands or red,violet,brown and gold . What is the resistance and tolerance of the resistor?

A

270 Ohms , 5%

74
Q

If a parallel circuit has only two branches RT=

A

RT+ 1/R1+1/R2+1/R3

Look at Ohms law

75
Q

Assume 3 resistors each having a value of 24 ohms are connected in parallel, What is the total resistance in ohms?

A

8 ohms

76
Q

The total power used in a circuit ___ the power used by all parts

A

is equal to the sum of

77
Q

The fact that total circuit resistance____ as resistance is added to a parallel circuit is easily misunderstood

A

Decreases

78
Q

A series circuit has ___ paths for current flow?

A

one

79
Q

____ is the force that pushes electrons through a resistance

A

Voltage

80
Q

In a series circuit the ___ of all the voltage drops across all resistors must equal the _____

A

Sum, voltage applied to the circuit

81
Q

The total amount of series resistance offered to the flow of current is___ to the sum of all the resistors in the circuit

A

inversely proportional

82
Q

In a circuit with an applied voltage of 120v and a total resistance of 60 ohms how much current flows through each resistor?

A

2A

I= E/R

83
Q

A series circuit has 2— 100 ohm resistors and 2 — 200 ohm resistors what is the total resistance?

A

600 ohms

RT=R1+R2+R3

84
Q

If a circuit requires___ current and ____voltage sources can be connected in parallel to combine

A

Higher and the same

85
Q

If a circuit is open current ____flow

A

will not

86
Q

Where is the number expressed in a code paragraph in U.S. customary units and S.I. units(metric) such as for mounting height

A

The code permits use of one or the other

87
Q

In a series circuit the ___is the same at any point in the circuit

A

Amperage

88
Q

When the color silver is used in the multiplier band it means to divide the numeric value of the resistor by?

A

100

89
Q

When the color silver is used in the multiplier band it means to divide the numeric value of the first 2 bands by?

A

10

90
Q

Resistors that have a tolerance of plus/minus 20% have____ color bands?

A

4 color bands

91
Q

The value of 6M-ohms is ___ohms

A

6 Million

92
Q

____ resistors have only one ohmic value which cannot be changed or altered

A

Fixed

93
Q

Bend radius of EMT

A

EMT 1/2=5”, 3/4=6”, 1”=8” and 1 1/2”=11”

Ridged 1/2=6”, 3/4=8” and 1”=11”

94
Q

Box sizing Table in NEC is

A

314.16(A)

95
Q

Permissible fill of a underfloor raceway is?

A

40%

96
Q

What location is not suitable for MC cable?

A

Concrete

97
Q

If a transformer has a 1 to 1 ratio it is a

A

Isolation transformer

98
Q

Minimum radius of a steel ground rod?

A

5/8”

99
Q

Maximum current of #16 AWG conductors is ?

A

10 Amps

100
Q

How is a Ammeter connected to a circuit?

A

In series

101
Q

Transformer 200 turns at 240v secondary has 100 turns. What is the secondary voltage?

A

120v

102
Q

The unit of pressure that causes current to flow is?

A

Volts

103
Q

On what date does everyone’s D licence expire?

A

July 31

104
Q

What is the value of resistor with yellow,violet and red?

A

4.7K

resistors value chart

105
Q

On what print would you find the breaker size?

A

Panel board schedule

106
Q

What is the best instrument to measure resistance on a large scale?

A

Megohmmeter

107
Q

An analog voltmeter is connected to a 24v DC circuit if the polarity is reversed what will the meter read?

A

Zero or fewer volts

108
Q

What is the voltage drop of a 240v 24 amp single phase load located 160ft from the panel using #10 THHN?

A

9.5v

109
Q

On what print would you find the the feeder size?

A

Power riser

110
Q

AC current load consisting of 8 similar devices.Each rated 120v and 200ws. Whats the total current connected?

A

13.3 amps

ohms law

111
Q

2 24 v batteries connected in sires

=

A

48V

112
Q

When 2 conductors are separated by a insulator electrical energy can be stored and released.What is stored?

A

Capacitance

113
Q

What is the total capacitance of 4 capacitors each rated to 20 micro farads connected in parallel?

A

80 micro farads

114
Q

What does a multi meter test?

A

All listed choices

115
Q

The first band on a resistor is blue . What is is designated number?

A

6

resistors value chart

116
Q

Find the power when you have 3 amp and 15 ohms?

A

135 Watts

ohms law

117
Q

If you have a change of address how long to you have to notify the board?

A

10 Days

118
Q

What type of conduit is made of PVC and color coded for use ?

A

ENT

119
Q

A device(outlet) is always counted as the largest size AWG in a box

A

pg 176 NFPA-70 314.16(A)

120
Q

14/2 A device counts as 2 wires the clamp on the box counts as 1 wire.
12/2 A device counts as 4 wires and the clamp as 2 wires

A

pg 176 NFPA-70 314.16(A)

121
Q

Class 2 is low Voltage Class 1-3 is High voltage (120v)

A
122
Q

Spacing of supports for 18AWG through 8 AWG shall be supported no greater than 100 ft apart

A
123
Q

Direct burial Table 300.5 pg 137 NFPA -70

A

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