Electrical 1A Comp Test PRACTICE

Feeder and service loads for fixed electric space-heating loads shall be calculated at _____ percent of the total connected load. 80 100 125 200

100

What is the maximum distance that two 14 AWG conductors can be run if they carry 16A and the maximum allowable voltage drop is 10V? D = (Cmil x VD)/(2 x K x I) D = (4,110 cmil x 10V)/(2 x 12.90 ohms x 16A) 50 ft 75 ft 100 ft 150 ft

100Ft

All switchboards, switchgear, panelboards, and motor control centers shall be located in dedicated spaces and protected from damage and the working clearance space for outdoor installations shall include the zone described in _____. 110.26(A) 110.26(B) 90.1 250.112(A)

110.26(A)

The numeric equivalent of 12^2 is _____. (12 squared) 3.46 24 144 1,728

144

If a 20A branch circuit supplies multiple receptacles, the receptacles shall have an ampere rating of no less than _____. 10A 15A 20A 30A

15A

For other than dwelling occupancies, banks, or office buildings, each receptacle outlet shall be calculated at not less than _____ VA. 90 180 270 360

180

The feeder/service calculated load for a multifamily dwelling containing nine 12 kW ranges is _____. 13,000W 14,700W 16,000W 24,000W

24,000W 220.55 table 220.55 column C

An electric arc blast can approach _____, which vaporizes metal parts and produces an explosive and deadly pressure wave. 10,000*F 15,000*F 25,000*F 30,000*F

30,000*F

\"Within sight from\" means visible and not more than _____ ft distant from the equipment. 10 20 25 50

50

In other than dwelling units, GFCI protection shall be provided for all 15A and 20A, 125V, single-phase receptacles installed within _____ ft from the top inside edge of the bowl of a sink. 3 4 5 6

6

An insulated grounded conductor _____ or smaller shall be identified by a continuous white or gray outer finish, or by three continuous white or gray stripes along its entire length on other than green insulation. 8 AWG 6 AWG 4 AWG 3 AWG

6 AWG

The maximum continuous load on an overcurrent protection device is limited to 80 percent of the device rating. If the overcurrent device is rated 100A, the maximum continuous load is _____. 72A 80A 90A 125A

80A

An overload is the same as a short circuit or ground fault. T or F

False

Insulators have four to five valence electrons. T or F

False

The direction of the electromagnetic field around a conductor because of current flow is determined by the right-hand rule as it relates to electron theory. T or F

False

The termination of the lightning stroke is unlikely to ignite combustible materials. T or F

False

When electricity is created by chemical activity, the electrons will flow in two directions. This is called "alternating current." T or F

False

When electrons are forced to move through a conductor, the magnetic fields of individual electrons subtract from one another. T or F

False

Installations shall comply with the material located in the NEC Annexes because they are part of the requirements of the Code. T or F

False 90.3

The polarity and the output voltage from an ac power source never change direction. T or F

False Ac is alternating

_____ conductors shall not be used for more than one branch circuit, one multiwire branch circuit, or more than one set of ungrounded feeder conductors except as allowed elsewhere in the Code. Equipment grounding Neutral Grounding electrode Bonding

Neutral

Voltmeters are connected in _____ with the circuit and measure the difference of potential between the two test lead. series parallel series-parallel none of these

Parallels

The _____ of a generator is forced to rotate while it is being subjected to the magnetic field of the stator. winding rotor stator b or c

Rotor

At least one lighting outlet controlled by a listed wall-mounted control device shall be installed in every habitable room, kitchen, and bathroom of a dwelling unit. T or F

True

Compounds can change the electrical characteristics of an individual atom. For example, the insulating aluminum-oxide compound is very difficult to break and it often results in the overheating of aluminum conductors at their terminals. T or F

True

DC power is determined by multiplying the electromotive force by the circuit intensity. T or F

True

Hard steel will retain a relatively large amount of its magnetism, but it does not have the magnetic strength of soft iron. T or F

True

If a conductor carrying current is next to another conductor carrying current in the opposite direction, the electromagnetic field attempts to push the conductors apart. T or F

True

Lightning frequently terminates to an elevated point and it strikes nonmetallic as well as metallic objects with the same frequency. T or F

True

Often the resistance of the power source and conductor are ignored in circuit calculations. T or F

True

Providing a path to the earth often helps reduce electrostatic charge. T or F

True

The attraction between the positive charge of the protons and negative charge of electrons keeps the electrons from breaking out of their orbit. T or F

True

The north end of a magnet can be determined by hanging a magnet by a string and allowing it to swing freely. T or F

True

The reason most metals are not magnetic is because their atoms tend to pair off in orbits with opposite spins so that their magnetic fields cancel each other. T or F

True

The severity of an electric shock is dependent on the current flowing through the body, which is impacted by circuit voltage and contact resistance. T or F

True

Where a lighting outlet(s) is installed for interior stairways, there shall be a listed wall-mounted control device at each floor level and landing level that includes an entryway to control the lighting outlet(s) where the stairway between floor levels has six risers or more unless remote, central, or automatic control is used. T or F

True

In devices or utilization equipment with polarized connections, identification of terminals to which a neutral conductor is to be connected shall be substantially _____ or silver in color. white green gold bronze

White

A multiwire branch circuit consists of _____. two or more ungrounded conductors that have a voltage between them a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit a grounded conductor connected to the neutral or grounded conductor of the system all of these

all of these

In judging equipment for approval, considerations such as _____ shall be evaluated. mechanical strength wire-bending space arcing effects all of these

all of these

Overcurrent devices shall not be located _____. where exposed to physical damage near easily ignitible materials, such as in clothes closets in bathrooms of dwelling units all of these

all of these

The NEC does apply to installations in _____. floating buildings mobile homes recreational vehicles all of these

all of these

To protect against electric shock or to prevent a fire, a dangerous _____ must quickly be removed by opening the circuit's overcurrent protection device. overload short circuit ground fault all of these

all of these

As applied to electrical equipment, the term "reconditioned" may be interchangeable with the term(s) "_____." rebuilt refurbished remanufactured any of these

any of these

A thermal-magnetic circuit breaker typically clears fault current in less than 3 to 5 cycles when subjected to a(n) _____. overload short circuit ground fault b or c

b or c

The conductor that rotates between the stationary magnetic field poles of the stator is called the "_____" winding rotor armature b or c

b or c

The volume of an enclosure is expressed in _____, and it is calculated by multiplying the length, by the width, by the depth of the enclosure. cubic inches weight inch-pounds none of these

cubic inches

Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts is called \"_____.\" guarded covered protection enclosed

enclosed

In a dc circuit, the only opposition to current flow is the physical resistance of the material. This opposition is called "reactance" and is measured in ohms. T or F

false, it is resistance

Chapters 1 through 4 of the NEC apply _____ generally to all electrical installations only to special occupancies and conditions only to special equipment and material all of these

generally to all electrical installations

Part III of Article 100 contains definitions which are applicable to _____. solar PV systems hazardous (classified) locations electrical systems over 1,000V healthcare facilities

hazardous (classified) locations

Circuit breaker enclosures shall be permitted to be installed _____ where the circuit breaker is installed in accordance with 240.81 vertically horizontally face up face down

horizontally

_____ breakers operate on the principle that as the current increases, the time it takes for the device to open decreases. Inverse time Adjustable trip Instantaneous trip all of these

inverse time

Where it is unlikely that two or more noncoincident loads will be in use simultaneously, only the _____ the loads used at one time is required to be used in computing the total load to a feeder. smaller of largest of difference between first 40 percent of

largest of

According to the Electron Current Flow Theory, electrons leave the _____ terminal of the source, flow through the conductors and load(s), and return to the _____ terminal of the source. positive, negative negative, positive negative, negative positive, positive

negative, positive

Circuit breakers shall _____ all ungrounded conductors of the circuit both manually and automatically unless specifically permitted otherwise. open close isolate inhibit

open

A \"service drop\" is defined as the overhead conductors between the utility electric supply system and the _____. service equipment service point grounding electrode equipment grounding conductor

service point

Power is not equal to E x I for ac circuits because consideration must be given to inductive reactance. T or F

true

Smaller conductors have greater resistance and larger conductors have lower resistance. T or F

true

The work that can be performed by the moving electrons depends on the circuit pressure and the circuit's opposition to the flow of electrons. T or F

true

Receptacles shall have the terminal intended for connection to the grounded conductor identified by a metal or metal coating that is substantially white or silver in color or by the word "_____." green white silver neutral

white