Electrician Exam Flashcards by Remy Omori

A pipe is coming out into the service wire connection between the grounded circuit conductor and the equipment grounding. What is this called?

A. Bonding jumper
B. Bonding jumper equipment
C. Bonding jumper main
D. Bonding jumper system

C. Bonding jumper main

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Which of the following is true when defining an approved electrical device?

A. It is NFPA approved
B. It is approved by local jurisdiction
C. It is manufacturers approved
D. Is it approved by a National authority

B. Is it approved by local jurisdiction

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The purpose of the National
Electrical Code is to provide ________.

A. A design specification for electrical installations
B. For efficient electrical installation
C. Requirements for safe electrical conditions
D. Installations that are adequate for good services

C. Requirements for safe electrical conditions

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A 480 volt conductor with a 2” concrete jacket should be buried to what depth?

a. 8”
b. 10”
c. 12”
d. 16”

c. 12”

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How are class 2 and class 3 circuits secured in a suspended ceiling?

a. secured to the ceiling grid
b. secured to the ceiling grid support wires
c. secured to the building grid
d. lay on top of the ceiling grid

c. secured to the building grid

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two conduits in a parallel conductor in separate raceways with a 225 amp load.
what is the minimum size in each parallel feed?

a. #2 THW
b. #1 THW
c. 1/0 THW
d. 2/0 THW

c. 1/0 THW

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what is the percentage of derating of current carrying conductors with 6 in each conduit?

a. 40%
b. 60%
c. 80%
d. 100%

c. 80%

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A residential dwelling with a 150 amps, 3-wire, single-phase service. What is the minimum aluminum THW service entrance permitted?

a. 1 AWG
b. 1/0 AWG
c. 2/0 AWG
d. 3/0 AWG

c. 2/0 AWG

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A 3-wire service to a single family dwelling with 100 amperes service feed. What is the minimum ground allowed?

a. 4
b. 6
c. 8
d. 10

c. 8

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Three 3/0 wires in THW conduit that passes through a boiler room with 125 degrees F ambient outside temperature. What is it rated?

a. 100 amps
b. 134 amps
c. 150 amps
d. 200 amps

b. 134 amps

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A 27 cubic inch metal pull box contains six No. 12 conductors. The maximum number of No. 10 ungrounded conductors which may be added to the box is ______.

a. 3
b. 5
c. 7
d. 9

b. 5

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The maximum number of No. 8 conductors permitted in a 4” x 1.5” square box shall be _____.

a. 2
b. 4
c. 7
d. 8

c. 7

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A single plastic 16” box, filled with three #12 wires terminated at the load and three #10 wires through the box with a splice ground wire originating outside the box. What size cubic inch box is required?

a. 18.74 cubic inches
b. 19.64 cubic inches
c. 16.32 cubic inches
d. 14.12 cubic inches

a. 18.74 cubic inches

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Non-metallic sheathed cable is to be used with a non-metallic outlet box. What minimum distance must the sheath of the cable extend into the box?

a. 1/8”
b. 1/4”
c. 3/8”
d. 1/2”

b. 1/4”

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Where non-metallic sheathed cable is used with a 2”x 4” box and is not secured inside the box, it must be fastened within ______ inches of the box measured along the sheath.

a. 6
b. 8
c. 10
d. 12

b. 8

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What minimum size liquid tight conduit is needed with a 480v motor, three No. 10 THWN and one No. 12 THWN for ground?

a. 1/4”
b. 1/2”
c. 3/4”
d. 1”

b. 1/2”

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Wires in a junction boxes________.

a. must be readily accessible
b. must always be accessible
c. must be accessible without removing any part of the building
d. cannot be covered with gravel or aggregate

c. must be accessible without removing any part of the building

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What is the maximum height of a disconnect handle?

a. 6’
b. 6’4”
c. 6’7”
d. 7’

c. 6’7”

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What is the maximum number of overcurrent devices (other than those provided for in the mains) permitted in a single cabinet of a lighting and appliance panelboard?

a. 30
b. 36
c. 42
d. 46

c. 42

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Each grounded conductor shall terminate within the panelboard with 1 wire per screw. When is it allowable for 2 wires to be secured to 1 screw?

a. the wire must be #12 gauge
b. the wires must be different gauges
c. when the terminal is identified for more than one connection
d. It is never allowed

c. when the terminal is identified for more than one connection

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What is the minimum height a chandelier can be hung above the lip edge of bathtub?

a. 5’
b. 7.5’
c. 8’
d. 10’

c. 8’

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Restaurant hood luminaries shall be permitted to be installed in the hood when all of the following conditions are met except

a. identified for that use
b. they are thermally protected
c. the pipes are exposed
d. they are corrosion resistant

c. the pipes are exposed

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A 40 gallon water heater with an 80% duty rating. How do you size the amperage?

a. 125% of full load amps
b. 100% of marked rating
c. 100% of full load amps
. 125% of marked rating

b. 100% of marked rating

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On a commercial range hood all of the following are true regarding the installation except______.

a. that the cord concealed
b. that the cord is supplied by an individual branch circuit
c. that the cord is protected by enclosed boxes
d. that the cord is protected from hazards

a. that the cord concealed

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heating cables shall be furnished complete with factory-assembled non-heating leads at least _____ in length. a. 4 feet b. 5 feet c. 6 feet d. 7 feet

d. 7 feet

3 motors having full load currents of 50 amps, 50 amps, and 70 amps respectively. For ungrounded conductors supplying all 3 motors, what is the minimum amperage required? a. 20amps b. 100 amps c. 170 amps d. 188 amps

d. 188 amps

what is used as short circuit protection to motor circuit conductors? a. motor overload relay b. circuit breaker c. motor controller d. relay

b. circuit breaker

A circuit supplies a continuous duty motor. What minimum percent of the motor nameplate full-load current rating is required to size the branch circuit? a. 100% b. 115% c. 125% d. 140%

b. 115%

Where should an overcurrent device be located on a water pump motor? a. After the pressure switch b. Before the pressure switch c. A minimum of 3 feet before the pressure switch d. Not necessary

b. before the pressure switch

General use SW amp rating 2-wire. The current rating of motor may serve as the motor controller. The motor is stationary and is limited to a maximum rating of 300v. What is the maximum horsepower? a. 1/4 b. 3/4 c. 1 to 1/2 d. 2

d. 2

On a stationary motor rated below 480 volts, what is the maximum horsepower for a on and off switch when switch is rated twice the continuous load of the motor? a. 3/4 hp b. 1 hp c. 1 1/2 hp d. 2 hp

d. 2 hp

An attachment plug and receptacle may serve as the motor controller if the motor is portable and has a maximum rating of ______. a. 1/8 hp b. 1/4 hp c. 1/3 hp d. 1/2 hp

c. 1/3 hp Stationery motor = 1/8 hp

With 100HP magnetic motor, what size motor controller is required? a. 100 b. 115 c. 125 d. 150

b. 115

GIVEN: Motor 1amp 125volt with no special insulation marking and rated for continuous duty. The motor circuit must be rated at what percent of motor current ready? a. 85% b. 100% c. 115% d. 125%

c. 115%

With 100amps motor, what size motor controller is required? a. 100 b. 115 c. 125 d. 150

b. 115

GIVEN: A 220 volt, 3-phase induction-type continuous duty motor rated at 40 horsepower. Each conductor in the branch circuit serving the motor shall be a minimum No. _____ copper type THW. a. 4 b. 1 c. 1/0 d. 2/0

c. 1/0

GIVEN: A 3-phase, wound rotor, 240 volt, 30HP motor. This motor requires a _____ dual element time delay fuse for overcurrent protection. a. 60 b. 80 c. 100 d. 120

d. 120

A room air conditioner rated 3-phase or rated over 250 volts shall be connected _________. a. with a 3-prong attachment plug b. with a 4-prong attachment plug c. with a grounding plug d. directly to the wiring

d. directly to the wiring

Exposed non-current carrying metal parts of fixed equipment likely to be energized shall be guarded by a minimum elevation of ______. a. 6' b. 8' c. 10' d. 12'

b. 8'

What is the minimum size conductor before a bushing is required to be used? a. 3 b. 4 c. 6 d. 8

b. 4

The maximum total voltage drop on both feeder circuits and branch circuits to the farthest outlet shall not exceed ______ percent. a. 2 b. 3 c. 4 d. 5

d. 5

A 2,400 sq. ft. dwelling unit requires _____ 20A breakers for the lighting circuits. a. 1 b. 2 c. 3 d. 4

c. 3

A warehouse with dimensions of 400ft by 600ft is supplied by single-phase, 120 volt service. What is the minimum number of 20 ampere circuit breakers required for the lighting load? The circuit breakers are not listed for 100% continuous operation. The load shall be considered continuous, and the connected and continuous shall be considered equal. a. 23 b. 25 c. 31 d. 32

d. 32

A 4,000 sq. ft. dwelling unit. What is the minimum lighting load required? a. 8,000 watts b. 6,150 watts c. 10,000 watts d. 12,000 watts

b.6,150 watts

Where the service entrance ungrounded conductors are No. 2/0 copper, the minimum size service entrance grounded conductor shall be No. _____ a. 4 b. 2 c. 1/0 d. 2/0

a. 4

Disregarding exceptions, what is the minimum clearance allowed from open overhead service conductors to the nearest edge of a window opening? a. 2' b. 3' c. 5' d. 6'

b. 3'

Conduit seals shall be installed within a maximum of ____ from enclosures. a. 10" b. 12" c. 18" d. 20"

c. 18"

GIVEN: A 60 ampere overcurrent device, non-motorized equipment. What is the minimum size equipment ground? a. 4 awg b. 6 awg c. 8 awg d. 10 awg

c. 8 awg

A service line is secured 12" to the loop. Outside that it should be supported every _____. a. 2' b. 3' c. 4' d. 30"

d. 30"

Which of the following transformers must be GFI protected? a. open-delta b. post-grounded c. grounded wye with more than 150 volts d. grounded wye with more than 600 volts

c. grounded wye with more than 150 volts

Service entrance cables shall be strapped______ from every head and a interval not exceeding _____. a. 10; 20 b. 12; 20 c. 10; 30 d. 12; 30

d. 12; 30

At what size does a service disconnect have to be ground-fault protected? a. 1,000 amps b. 600 amps c. 400 amps d. 200 amps

a. 1,000 amps

Ground fault protection of service equipment shall be provided for solidly grounded wye electrical services of more than 150 volts to ground. These services shall be a maximum of 600 volts of each service disconnecting means rated more than _______. a. 600 amps b. 800 amps c. 1,000 amps d. 1,200 amps

c. 1,000 amps

Overcurrent devices consisting of uses and/or circuit breakers shall not be arranged or installed _____ unless factory assembled. a. to open short circuits b. in parallel c. in series d. to trip readily

b. in parallel

Overcurrent protection device enclosures located in damp or wet locations shall have a minimum of ____ air space between it and a wall surface to which is mounted. a. 1/8 inch b. 1/4 inch c. 3/8 inch d. 1/2 inch

b. 1/4 inch

Where a circuit breakers is used as switch in a fluorescent lighting circuit, it shall be marked ______. a. "SFL" b. "SWD" or "HID" c. "SWF" d. "T"

b. "SWD" or "HID"

Where required, the grounding terminal of a grounding-type receptacle shall be connected to a grounded box with a _____. a. equipment bonding jumper b. grounding conductor c. grounded circuit conductor d. ungrounded circuit conductor

a. equipment bonding jumper

What is the minimum allowed length of an underground water pipe that can be used as a ground connection? a. 5' b. 10' c. 12' d. 15'

b. 10'

Where interior metal water piping is used as grounding electrode it shall not be interconnected with the grounding electrode conductor more than _____ ft from the point of entrance to the building. a. 2 b. 5 c. 10 d. indefinite- Code does not specify

b. 5

What is the minimum size conductor you can tie into #2 ground ring? a. 1 awg b. 2 awg c. 3 awg d. 4 awg

b. 2 awg

What is the diameter of steel or iron(malleable) ground rod? a. 1/2" b. 5/8" c. 3/4" d. 1"

b. 5/8"

A ground ring consists of 300' bare copper wire conductor encircling the building or structure with direct contact with earth. What is the minimum copper conductor size? a. #8 b. #6 c. #4 d. #2

c. #2

What is true if one ground rod is installed and the resistance to ground is measured to be 48 ohms? a. It must have installation of one (only) additional ground rod b. It must have installation of one or more additional ground rods until the 25 ohm maximum requirement is met c. It must have relocation of the ground rod to meet the 25 ohm maximum requirement d. It must have a non-fereous rod added on

a. It must have installation of one (only) additional ground rod

GIVEN: A 100 amp service THHW to a single family dwelling. What size is the equipment bonding jumper on the supply side? a. 12 b. 10 c. 8 d. 6

c. 8

Where an equipment bonding jumper is installed on the outside of a raceway or panel, its length shall not exceed ______ feet. a. 6 b. 8 c. 10 d. 12

a. 6

Conduit seals shall be installed within a maximum of ____ from enclosures. a. 10" b. 12" c. 18" d. 20"

c. 18"

With 3/4" conduit in a Division 1 Class 1 area, what is the minimum thickness of sealing compound that can be used? a. 1/2" b. 5/8" c. 3/4" d. 1"

b. 5/8"

What is the minimum height for fixed lighting that is located over lanes in commercial garages? a. 22' b. 10' c. 12' d. 18'

c. 12'

From a remote outdoor gas pump, the maximum distance considered a Division 2 location is _____ feet from the pump. a. 3 b. 5 c. 10 d. 20

c. 10

A 55 gallon drum of anesthesia is considered ______. a. Class 1 Division 1 b. Class 1 Division 2 c. Class 2 Division 1 d. Class 2 Division 2

a. Class 1 Division 1

For foot stage lights, the wires in the trough shall be kept at a distance of at least ______ from the metal of the trough. a. 1/4" b. 1/2" c. 3/4" d. 1"

b. 1/2"

A mooring unit is located in a shelter cove in salt water. The required grounding electrode shall be ____. a. attached securely to the hull b. submerged at least 8 ft in the surrounding water c. driven into the earth beneath the dwelling d. driven into the earth ashore

d. driven into the earth ashore

A receptacle in damp or wet locations located in an electrical service yard without an inspection plan shall be ________. a. 18" off the ground b. 1/2" away from the wall c. be GFI protected d. be a standard receptacle

c. be GFI protected

A 480 volt 3-phase direct current welder is rated at 23 amperes primary current and has a duty cycle of 40 percent. What minimum amp is required for the underground branch circuit? a. 12 b. 20 c. 30 d. 40

c. 30

GIVEN: An AC transformer and DC rectifier arc welder with a 70 percent duty cycle. The ampacity of the suppler conductors shall be calculated by multiplying the nameplate current by a factor of ______. a. .95 b. .89 c. .84 d. .78

c. .84

A 240 volt-to-ground overhead service cable shall have a minimum clearance to a swimming pool diving platform _____ feet. a. 10.5 b. 12 c. 14.5 d. 18

c. 14.5

When there is a power outage in a hospital and automatic switching equipment is activated to emergency service, what is the required time delay setting for re-establishment for the normal service when normal power is restored? a. Not more than 10 seconds b. 30 seconds c. 5 minutes d. 15 minutes

d. 15 minutes

On a Class 1 Power-Limited circuit, what is the highest voltage that is allowed? a. 24 b. 30 c. 40 d. 50

b. 30

The minimum wire size on a Class 1 Division 1 signaling device shall not be smaller than No. _________. a. 14 b. 16 c. 18 d. 22

c. 18

Only Class 1 circuits are allowed in a a raceway. The derating factor shall apply only if the conductors _________. a. have insulation rated at grater than 600 volts b. use over 40% of the raceway c. carry continuous loads in excess of 10% of ampacity d. are size 16 awg or smaller

c. carry continuous loads in excess of 10% of ampacity

Single conductors on Class 3 remote-control, signaling and power limited circuits shall not be small than No. ______. a. 14 b. 16 c. 18 d. 22

c. 18

What is the conductive optical fiber cable? a. A cable that contains non-current carrying conductive members such as metallic strength members b. A cable containing optical fibers c. A cable containing current-carrying electrical conductors d. None of the above

a. A cable that contains non-current carrying conductive members such as metallic strength members

The type of optical fiber cable that is current carrying electrical conductors and shall be permitted to contain non-current conductive members is a ____ cable. a. non-composite b. composite c. non- conductive d. conductive

b. composite

Optical fiber cables are grouped into three types. Which of the following is not a type of optical cable? a. Conductive b. Non-conductive c. Capacitive d. Composite

c. Capacitive

A data cable and communication and service drop run in parallel. What is the minimum separation between cables at the point of attachment to the building. a. 10" b. 12" c. 14" d. 16"

b. 12"

Type CMX cable cannot be used on which of the following applications? a. Hotels b. Single-family dwellings c. Multi-family dwelling d. Raceways or conduits

a. Hotels

When a conduit nipple having a maximum length not to exceed 24 inches is installed, the nipple shall be permitted to be filled to _______. a. 30% b. 40% c. 50% d. 60%

d. 60%

The maximum number of No. 12, Type THHN conductors permitted in a 20 foot length of 3/4" EMT is ________. a. 9 b. 10 c. 12 d. 16

d. 16

With TFFN conductors, what is the maximum number of wires an 1/2" EMT? a. 12 b. 18 c. 22 d. 24

c. 22

GIVEN: TFFN conductors, 18 conductors in a 3/4" 16 gauge. What is the allowed number of fixture wires? a. 12 b. 24 c. 30 d. 50

c. 30

On a supply or service lateral with #4 gauge wire, which of the following wire can not be used? a. TW b. THWN c. USC d. XHHW

a. TW

What is the power loss on a 75 Kva transformer rated at 90 amps with resistance of .16 ohms? a. 1,200 watts b. 1,300 watts c. 1,400 watts d. 1,500 watts

b. 1,300 watts

In what method should one connect three capacitors of different values in an electrical circuit such that the total capacitance is greater than the value of the largest capacitor with the circuit? a. in series b. in parallel c. two capacitors in series and third capacitor in parallel d. two capacitors in parallel and third capacitor in series

b. in parallel

600 micro-farads is equal to what portion of one farad, the unit of capacitance? a. 6 b. .06 c. .006 d. .0006

d. .0006

Electrical pressure or electromotive force is measured in ______. a. amperes b. volts c. watts d. resistance

b. volts

An 11 ohm resistor is the only load connected to an 11 volt source. The power used in the circuit is ______ watts. a. .1 b. 1.0 c. 1.1 d. 11.0

d. 11.0

GIVEN: The largest available conductor for an electrical installation has a resistance of 1.5 ohms per 1,000 feet. To meet the voltage drop specifications, the maximum resistance of the circuit is 0.3 ohm. The maximum total length of conductor is the circuit is ____ feet. a. 200 b. 300 c. 400 d. 500

a. 200

When three resistors with values of 10, 15, and 25 ohms respectively, are connected in parallel, the combined total resistance is _____. a. 0.4 b. 2.6 c. 4.8 d. 40.0

c. 4.8

What is the term used to measure surface illumination? a. Lumen b. Candle area c. Candlepower d. Foot-candle

d. Foot-candle

GIVEN: A motor control circuit requires relay contacts that immediately change position when the relay coil is energized, but are delayed in changing back to the original position when the coil is de-energized. This type of control requires an ___ relay. a. off delay b. time-delay on de-energizing c. control (voltage) d. overload

a. off delay

GIVEN: 3 motors having full load currents with 7.5HP, 480v, WDE-E, FLA 10.3, 3-phase, service factor of 1.15 degrees rise 40, duty continuous, maximum short circuit protective motor with instantaneous trip circuit breaker. What is the maximum rating? A. 50 amps B. 60 amps C. 90 amps D. 125 amps

C. 90 amps

GIVEN: An underground rigid non-metallic raceway which is 10 feet long. What is the maximum number of bends allowed? A. Four 90 degree bends B. Forty 90 degree bends C. A total of 1800 degree bends D. A total of 3600 degree bends

A. Four 90 degree bends | Alt. Answer: six 60 degree bends

When three resistors with values of 10, 25, and 50 ohms respectively, are connected in parallel, the combined total resistance is _______. A. 0.4 B. 2.6 C. 6.3 D. 40.0

C. 6.3

The National Electrical Code defines “continous load” as a load where the maximum current is expected to continue for _______. A. One hour or more B. Two hours or more C. Three hours or more D. Twenty four hour a day

C. Three hours or more

A multifamily dwelling contains a minimum of _______ dwellings. A. 1 B. 2 C. 3 D. 4

C. 3

What is the definition of voltage (of a circuit)? A. The greatest root-mean-square difference of potential between any two conductors of the circuit concerned B. The current a conductor can carry continuously C. The connection between two pieces of equipment D. The maximum current a load can carry

A. The greatest root-mean-square difference of potential between any two conductors of the circuit concerned

What is true about installation of listed or labeled equipment? A. it shall be installed only by licnesed contractors B. It shall be installed and uses in accordance with any instructions included the listing or labeling C. It shall be intsalled by apporpriate manufacturers D. It shall be installed per code

B. It shall be installed and used in accordance with any instructions included the listing or labeling

Service-entrance conductors exposed to physical damage can be installed in any of the following except _________. A. Rigid metal conduit B. Emt C. Liquidtight metal conduit D. Schedule 80 pvc

C. Liquidtight metal conduit

Required grounding conductors and bonding jumpers shall not be connected by _______ connections. A. Pressure B. Soldered C. Clamped D. Bolted

B. Soldered

Where a motor is connected by means of a cord and plug, the rating shall not exceed _______ amps. A. 15 B. 20 C. 30 D. 40

A. 15

GIVEN: 2 1/2” conduit with three 4/0 THW wire passing through the pull box. What is the minimum length for the box? A. 20” B. 18” C. 15” D. 12”

A. 20”

The impedance shall be marked on the nameplate of every transformer larger than _________. A. 10 kilovolt amps B. 15 kilovolt amps C. 20 kilovolt amps D. 25 kilovolt amps

D. 25 kilovolt amps

Some transformers may be located in area not “readily accessible”. What is the maximum rating allowed for these transformers? A. 50 VA B. 150 VA C. 50 kVa D. 150 kVa

C. 50 kVA

Walls, roofs, and floors for vaults 600v and over shall have a minimum fire resistance rating of ________ hours. A. 2 B. 3 C. 5 D. 6

B. 3

A capacitor located indoors shall be enclosed in a vault if it contains more than _______ gallons of flammable liquids. A. 2 B. 3 C. 4 D. 5

B. 3

The minimum size electrical metallic tubing required for installation of the conductors listed below is_______. Two 500 kcmil THHN Two 4/0 THHN One 2/0 THHN A. 2” B. 2 1/2 “ C. 3” D. 3 1/2”

B. 2 1/2”

Open overhead wiring above a swimming pool or surrounding areas shall be installed at least ________ abover water level. A. 12 feet B. 15 feet C. 18 feet D. 22 feet

D. 22 feet

Sealed cans of gasoline may be stores in a _________ area. A. Class 1, division 1 B. Class 1, division 2 C. Class 2, divison 1 D. Class 2, division 2

B. Class 1, divison 2

The interior of paint spray booths are considered______. A. Class 1, divison 1 B. Class 1, divison 2 C. Class 2, divison 1 D. Class 2, divison 2

A. Class 1, divison 1

Electrician Exam Flashcards

(119 cards)