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NCCER electical test > Journeyman test questions > Flashcards

Journeyman test questions Flashcards

1
Q

What is the primary consideration in selecting the proper rope for a cable pull? A. cost B. speed C. safety D. Accuracy

A

C. safety

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2
Q

Why can a lead acid battery be an explosive hazard? A. acid is explosive when mixed with air B. hydrogen gas is produced during charge and discharge C. PCBs in batteries are explosive D. batteries are constructed of flammable material

A

B. hydrogen gas is produced during charge and discharge

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3
Q

What is the largest size conductor that can terminate on a 20 amp receptacle? A. 14 awg B. 12 awg C. 10 awg D. 8 awg

A

C. 10 awg

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4
Q

Normally the easiest place to reverse the leads to change the direction of rotation of a 3 phase motor is at the A. switchgear B. motor push button start/stop station C. motor starter D. power transformer

A

C. motor starter

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5
Q

What maximum number of bends is allowed between fittings in a one conduit run? A. Three quarter bends or 360 degrees B. Three quarter bends or 180 degrees C. Four quarter bends or 360 degrees D. Four quarter bends or 180 degrees

A

C. Four quarter bends or 360 degrees

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6
Q

What size wire is standard for 120 volt motor control systems? A. #8 B. #14 C. #16 D. #20

A

B. #14

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7
Q

In all cases where live parts are normally exposed on the front of switchboards or motor control centers, the working space in front of such equipment must be what minimum length? A. 2 feet B. 2 1/2 feet C. 3 feet D. 3 1/2 feet

A

C. 3 feet

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8
Q

What is the interupting rating of a fuse? A. the maximum value of current that a fuse is designed to interupt B. the minimum value of current that will blow a fuse without damage to the fuse itself C. a percentage of the normal operating current of the fuse D. the time it takes a time delay fuse to blow

A

A. the maximum value of current that a fuse is designed to interupt

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9
Q

What is the symbol for the primary side of a transformer? A. M B. P C. H D. X

A

C. H

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10
Q

A megger will be used to check a cable. The electrician must be sure that the circuit is A. live and at operating voltage B. live and at operating amperage C. de-energized and locked, tagged out, and tested D. de-energized with the cable ends taped together

A

C. de-energized and locked, tagged out, and tested

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11
Q

What is the function of a ballast in a fluorescent fixture? A. steps down the voltage B. steps up the voltage C. steps down the current D. steps up the current

A

B. steps up the voltage

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12
Q

What is the primary purpose of a P & ID A. shows origin, destination, types of control mechanisms and mechanical flow, but is not drawn to scale. B. provides detailed scaled information on elevation, coordinates, and measurements of instruments. C. provides scale drawings of piping and instrumentation control systems D. shows tubing supports and tubing tray installation locations to scale with detailed elevation

A

A. shows origin, destination, types of control mechanisms and mechanical flow, but it is not drawn to scale

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13
Q

Which of the following factors is used to control the speed of an induction motor? A. voltage B. current C. frequency D. load

A

C. frequency

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14
Q

A 10 inch offest at 30 degrees is being made. What is the distance between center-to-center bends? A. 10 inches B. 20 inches C. 25 inches D. 30 inches

A

B. 20 inches

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15
Q

Reels of cable are in storage. What is the purpose of sealing cable ends? A. to keep moisture from creeping in B. to indicate the cable has been tested C. to prevent chemical decomposition D. to prevent insulation breakdown

A

A. to keep moisture from creeping in

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16
Q

What is insulating tape? A. adhesive tape that has been manufactured to keep the conductors warm. B. non-adhesive tape used to cover devices C. non-conductive adhesive tape D. non-adhesive tape used as phase tape

A

C. non-conductive adhesive tape

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17
Q

Branch circuit conductors must have a minimum ampacity rating of what percent of the motor full load amps? A. 125% B. 150% C. 175% D. 200%

A

A. 125%

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18
Q

Which of the followng should be used to cool a dry transformer? A. carbon dioxide B. askarel C. fans D. chilled water system

A

C. fans

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19
Q

Which of the following statements is true about “intrinsically safe equipment”? A. the term identifies tools for the safety department B. such equipment can be used in hazardous locations C. intrinsically safe equipment is part of the PPE D. intrinsically safe equipment identifies one component in a boiler igniter

A

B. such equipment can be used in hazardous locations

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20
Q

Who is allowed to remove another electrican’s tag of lock from any valve, switch, or peice of equipment without proper documentation and approval? A. an inspector B. no one C. any supervisor D. owner

A

B. NO ONE

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21
Q

The minimum acceptable DC megohm resistance of a 4160 volt motor is approximately A. 1.0 megohms B. 4.2 megohms C. 10.0 megohms D. 42.0 megohms

A

B. 4.2 megohms

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22
Q

The drawing scale is most likely to be found in which of the following drawing locations? A. the lighting-fixture schedule B. the symbol list C. the drawing title block D. the power riser diagram

A

C. the drawing title block

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23
Q

Which of the following statements about a service neutral conductor is true? A. it must always be larger thatn the ungrounded conductors B. it must have green insulation for identfication C. it may be smaller than the ungrounded conductors D. it is used only for an equipment ground and never carries a current

A

C. it may be smaller than the ungrounded conductors

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24
Q

What types of conduit can be safely used in a corrosive environment? A. galvanized steel and plastic coated B. galvanized steel and copper alloy C. black iron steel and galvanized D. copper alloy and plastic coated

A

A. galvanized steel and plastic coated

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25
Q

The leads on a type K thermocouple are A. blue and red B. yellow and whie C. purple and red D. yellow and red

A

D. yellow and red

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26
Q

What is the minimum headroom at service equipment? A. 6 feet B. 6 feet and 6 inches C. 7 feet D. 8 feet

A

B. 6 feet and 6 inches

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27
Q

What does thermal overload protect in a starter or MCC? A. fuses B. motors C. wires D. breakers

A

B. motors

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28
Q

How are the primary leads on the line side of a typical tapped transformer labeled? A. P1, P2, P3 B. H2, H2, H3 C. L1, L2, L3 D. T1, T2, T3

A

B. H1, H2, H3

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29
Q

What is an acceptable protection technique for electrical equipment in hazardous locations? A. use more tape on splices B. use back to back boxes C. use dust ignition proof equipment D. use stainless steel devices

A

C. use dust ignition proof equipment

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30
Q

What is the purpose of Lockout/Tagout? A. starts up operation B. slows down operation C. checks operation D. prevents operation

A

D. prevents operation

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31
Q

What test or eqipment can be used to locate a suspected short circuit in one phase of a 3 phase motor? A. wattmeter B. megger C. balance current D. voltage drop

A

B. megger

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32
Q

A one line diagram with simplified symbols indicates the A. wiring of instrumentation circuits B. information on the starter and possible interlocks C. interconnections and component parts of an electrical circuit D. physical location of electrical equipment

A

C. interconnections and component parts of an electrical circuit

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33
Q

What will happen if moisture is inside a cadweld mold while the weld is being performed? A. the cadweld powder will burn too slowly B. the cadweld mold could explode C. the cadweld mold will have stress cracks D. the cadweld mold will operate normally

A

B. the cadweld mold could explode

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34
Q

What is produced in a conduit run by making two equal bends in opposite directions? A. offset B. sweep bend C. concentric bend D. saddle bend

A

A. offset

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35
Q

Cable trays are usually supported by all of the following means except A. direct rod suspension B. trapeze mounting C. wall and pipe rack mounting D. #9 wire

A

D. #9 wire

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36
Q

What is the most common service used in a tempory power panel? A. 120 volt, 1-phase, 2-wire B. 120/240 volt, 1 phase, 3 wire C. 120/208 volt, 3 phase, 3 wire D. 277/408 volt, 3 phase, 4 wire

A

B. 120/240 volt, 1 phase, wire

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37
Q

What are the two most common types of overcurrent protective devices? A. heaters and blowers B. circuit breakers and fuses C. edison bases and time delay devices D. safety switches and load centers

A

B. circuit breakers and fuses

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38
Q

What instrument is used to perform an insulation resistance test on a 480 volt motor winding? A. potentiometer B. megohmmeter C. phase meter D. multimeter

A

B. megohmmeter

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39
Q

Why is a seal installed in a run of conduit in a Class I location? A. identify that the work on a light is complete B. prevent the passage of explosive gases in the conduit C. provide waterproof protection only D. identify hazardous areas undergoing repair

A

B. prevent the passage of explosive gases in the conduit

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40
Q

Which of the following is the correct formula for Ohm’s law? A. I = E/R B. E=P/E C. R= E x I D. P = E/R

A

A. I=E/R

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41
Q

Which of the following testing instruments operates on the current transformer principle? A. megger B. clamp on ammeter C. ohmmeter with test leads D. voltmeter with test leads

A

B. clamp on ammeter

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42
Q

A drawing showing a Point A to Point B hookup of conductors is called a A. section B. plot plan C. wiring diagram D. schematic

A

C. wiring diagram

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43
Q

Which Article of the NEC cover grounding? A. 700 B. 380 C. 310 D. 250

A

D. 250

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44
Q

Which of the following is a 90 degree, explosion proof fitting? A. GUAL B. GUAT C. GUAD D. GUAS

A

A. GUAL

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45
Q

What is a dropout plate? A. metal plate that failed UL listings during a test B. metal plate with a curved surface for cable to follow as it passes from the tray C. plate used to pull cable into trays D. replacement assembly for broken tray rungs

A

B. metal plate with a curved surface for cable to follow as it passes from the tray

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46
Q

All of the following are common service voltages in the United States except? A. 120/208 3 phase 4 wire B. 120/240 single phase C. 277/480 3 phase 4 wire D. 372/575 3 phase 4 wire

A

D. 372/575 3 phase 4 wire

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47
Q

What does a GFCI breaker do? A. connects pumps and meters for flow control B. opens a circuit to prevent operation of an electrical device C. locks, tags, and tries an instrumentation system D. translates electrical signals to digital signals

A

B. opens a circuit to prevent operation of an electrical device

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48
Q

What will happen when one or more coils in a winding are grounded? A. the motor will continually blow fuses B. the motor will make a grinding noise C. the motor will cause the brushes to ark D. the motor will shock the operator

A

A. the motor will continually blow fuses

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49
Q

Eight incandescent lighting fixtures are to be installed. Each fixture is 120 volts with a 200 watt lamp. What is the total connected load? A. 13.3 amps B. 12.3 amps C. 11.7 amps D. 10.2 amps

A

A. 13.3 amps

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50
Q

If a voltage source of a circuit provides 240 volts and there are 5 ohms of resistance, how much current is in the circuit? A. 20 amps B. 25 amps C. 48 amps D. 23.5 amps

A

C. 48 amps

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51
Q

What instrument is used to measure current? A. ohmeter B. wattmeter C. ammeter D. voltmeter

A

C. ammeter

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52
Q

What are the three elements in every electrical circuit? A. Power source, wires and leads B. generator, underground cable, and motor C. battery, wire, and lamp D. power source, switch, load

A

A. power source, wires and leads

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53
Q

What are the two most commonly used methods of terminating grounding? A. Hipcot and mechanical B. exothermic (cadwelding) and mechanical C. arc welding and mechanical D. gas welding and mechanical

A

B. exothermic (cadwelding) and mechanical

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54
Q

Chico sealing compound is to be applied in an EYD fitting. The electrician must make sure that A. the drain remains clear B. the drain is completely sealed C. fiber is placed in the high point D. fiber is placed in front of the conductors

A

A. the drain remains clear

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55
Q

How should power cable and signal cable be placed in the same cabletray? A. lay cables next to each other, making sure they do not touch B. pull all power cables before pulling signal cables. C. place the power cables at least 1 1/2 inches from the signal cable D. place a divider between the signal cables and the power cable

A

D. place a divider between the signal cables and the power cable

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56
Q

The point of attachment of service drop conductors must provide minimum clearance as specified in what NEC table? A. 370-6 B. 310-16 C. 250-27 D. 230-24

A

D. 230-24

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57
Q

Which of the following components is part of a dual element fuse? A. time delay B. rejection clip C. short circuit D. reset

A

A. time delay

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58
Q

A holding contact in a motor starter is normally connected in parallel with the A. stop push button B. start push button C. starter coil D. transformer

A

B. start push button

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59
Q

The potential across the circuit is 480 volts and the current is 50 amps. What is the resistance of the circuit? A. 4.8 ohms B. 9.6 ohms C. 48.0 ohms D. 96.0 ohms

A

B. 9.6 ohms

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60
Q

How does a battery produce voltage? A. electromagnetism B. heat C. chemical reaction D. pressure

A

C. chemical reaction

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61
Q

An analog voltmeter is being connected to a 24V DC circuit. Polarity is reversed. What reading will occur? A. 0 or fewer volts B. 12 volts C. 24 volts D. 48 volts

A

A. 0 or fewer volts

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62
Q

What type of NEMA class enclosure is approved for general purpose indoor use and is not dust-tight or drip-proof? A. type 1 B. type 3B C. type 7 D. type 9

A

A. type 1

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63
Q

What NEC table indicates the size of service conductors? A. table 250-66 B. table 250-122 C. table 310-16 D. table 318-9

A

B. table 250-122

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64
Q

Four inch square boxes are available with all of the following depths except A. 1 inch B. 1 1/4 inch C. 1 1/2 inch D. 2 1/8 inch

A

A. 1 inch

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65
Q

What is installed at an expansion joint to provide a continuous ground between two sections of a cable tray? A. a bonding jumper B. a splice plate C. an expansion cable D. an insulator

A

A. a bonding jumper

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66
Q

What color identifies an insulated, grounded, Number 4 conductor? A. black B. white C. red D. green

A

D. green

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67
Q

Why is it important to torque bolts when busbars are connected? A. decreases voltage capacity of the busbar B. increases voltage capacity of the busbar C. decreases resistance on the connection D. increases resistance on the connection

A

C. decreases resistance on the connection

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68
Q

All of the following are protective devices except A. fuses B. circuit breakers C. solenoid D. overload relay

A

C. solenoid

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69
Q

Service conductors are size based on what factor? A. the total calculated load of the building B. the largest size feeder C. the largest motor load D. the total are of the building

A

A. the total calculated load of the building

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70
Q

The number of complete A-C cycles per second is called the A. frequency B. sine wave C. potential D. effective value

A

A. frequency

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71
Q

What is the purpose of a thermocouple? A. to measure pressure B. to measure flow C. to join steam trace lines of different sizes D. to measure temperature

A

D. to measure temperature

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72
Q

A brass colored terminal on a receptacle indicates that it should be used to connect what type of wire? A. ground wire B. white wire C. neutral wire D. hot wire

A

D. hot wire

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73
Q

What is the standard length of rigid conduit? A. 20 feet B. 16 feet C. 10 feet D. 8 feet

A

C. 10 feet

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74
Q

An angle or U pull is made with #4 wire or larger. The distance between each raceway entry inside the box and the opposite wall of the box shall not be any less than how many times the trade diameter of the largest raceway? A. 4 times B. 6 times C. 8 times D. 10 times

A

A. 4 times

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75
Q

Where should a stress cone be used? A. fiber optic termination B. high voltage termination C. high current termination D. instrument cable ground

A

B. high voltage termination

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76
Q

A cable rated for 5kV insulation can safely carry what maximum voltage? A. 500 volts B. 5000 volts C. 50000 volts D. 500000 volts

A

B. 5000 volts

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77
Q

Which of the following statements describes the operating features of a thermal overload relay? A. the greater the overload, the longer it takes the device to trip B. the greater the overload, the shorter the time of tripping C. a thermal overload relay offers greater protection against short circuits D. a thermal overload relay offers minimal protection againt overload

A

C. a thermal overload relay offers greater protection against short circuits

78
Q

What does HOA usually mean in a motor control circuit? A. hands off apparatus B. hands off automatic C. holding only amperage D. has only automatic

A

B. hands off automatic

79
Q

A 120/208 volt feeder consists of an 800 foot run of 500 kcmil aluminum wire in conduit. The feeder has a 5% voltage drop. hat will the phase to phase voltage be at the load end? A. 197.60 volts B. 201.76 volts C. 203.84 volts D. 208.00 volts

A

A. 197.60 volts

80
Q

What is voltage? A. number of cycles of AC cuurent completed in 1 second B. rate of flow of an electric current C. electromotive force D. resistance of the circuit

A

C. electromotive force

81
Q

What is the standard wire size system used in the United States? A. AWG B. UL C. ANSI D. NEC

A

A. AWG

82
Q

A switch labled “AL-CU” can be used with what type of wire? A. aluminum only B. aluminum, copper, or copper clad aluminum C. copper only D. coaxial

A

B. aluminum, copper, or copper clad aluminum

83
Q

What type of conduit fitting is usually placed in the middle of a long run of rigid metal conduit to provide access for pulling wire? A. C B. LB C. LR D. GAU

A

A. C

84
Q

What is the largest size of a aluminum rigid conduit couplings? A. 3 inches B. 4 inches C. 5 inches D. 6 inches

A

D. 6 inches

85
Q

To properly insall a compression lug on a conductor requiring multiple crimps, the electrician will crimp A. the lug in the middle and work the die to the lug eye, then from the middle t the barrrel opening B. starting from the lug eye to the barrel opening C. starting from the barrel opening to the lug eye D. the lug in the middle and work the die to the barrel opening and then from the middle to the lug eye

A

B. starting from the lug eye to the barrel opening

86
Q

All of the following are standard fuse sizes except A. 500 amp B. 550 amp C. 600 amp D. 601 amp

A

D. 601 amp

87
Q

What type of circuit breaker was developed to meet the needs of modern power systems where high potential fault currents are present? A. current limiting B. explosion proof C. molded case D. plug in type

A

A. current limiting

88
Q

Where are the overload heaters normally located in a motor circuit? A. in the motor starter between the T leads and the contactors B. in the motor starter between the T leads and the terminal strip C. in the motor junction box and the start/stop station D. in the first junction box between the motor starter and the motor junction box

A

A. in the motor starter between the T leads and the contactors

89
Q

A heat trace cable is installed on a line that will be insulated. When will the cable be “megged”? A. only before the insulation is put on the line B. before and after the insulation is put on the line C. only when the heat trace fails to operate properly D. when the heat trace is at its full operating temperature

A

B. before and after the insulation is put on the line

90
Q

Voltage has been stepped down in a transformer. What happens to the current in the secondary? A. it remains the same B. it decreases C. it increases D. it reverses polarity

A

C. it increases

91
Q

The standard unit for measuring the cross sectional area of wire is the A. circular mil B. square mil C. round mil D. radial mil

A

A. circular mil

92
Q

What is the correct combination for hooking up a 480 volt motor with nine leads? A. L1 & 2,3, &4, 5&6, 7 & T1 B. L1 & T1, L2 & T2, L3 & T3, 4 & 7,5 & 8, 6 & 9 C. 1 &2 &3 &T1, 4 &5 &T2, 7&8&9&T3 D. T1 &T2 &T3, L1 & L2 &L3, 4 &5&6, 7 &8&9

A

B. L1 &T1, L2 &T2, L3 &T3, 4 &7, 5&8, 6 &9

93
Q

A conduit bending hickey can be used to bend conduit from A. 0 to 15 degrees B. 0 to 30 degrees C. 0 to 45 degrees D. 0 to 90 degrees

A

A. 0 to 15 degrees

94
Q

What should be used on every wire pull through conduit? A. 1/2 inch rope B. tugger C. wire lube D. Kellum’s Grip

A

C. wire lube

95
Q

When should a de-oxide compound be used? A. during a megger test B. during a wire pull C. during an aluminum to copper connection D. durging load calculations

A

C. during an aluminum to copper connection

96
Q

Given: The distance between a starter and a 3 phase motor is 73 feet. The starter must have a 5 foot tail and the motor a 3 foot tail. How much multi-conductor wire is required for a pull from the starter to the motor? A. 58 feet B. 62 feet C. 81 feet D. 264 feet

A

C. 81 feet

97
Q

All of the following information is found on a one line diagram of a substation except the A. fuse size B. kVA of transformer C. scale D. wire size

A

C. scale

98
Q

In a Class I, Division I area, what type of electrical fittings are required? A. plastic coated B. plastic lined C. dustproof D. explosion proof

A

D. explosion proof

99
Q

Which of the following is the heating element in a self regulating heat tracer? A. fluoropolymer jacket B. bus wire C. metal braid D. semiconducting core

A

D. semiconducting core

100
Q

What should be done with tools extension cords with the ground prong removed or missing? A. they should be used only in dry areas B. they should be used only with a GFCIC. C. they should be tagged “do not use” at the end of the shift D. they should be removed immediately from use and tagged “do not use”

A

D. they should be removed immediately from use and tagged “do not use”

101
Q

When is it acceptable to perform maintenance repair on plant system without lockout and tagged? A. if lockout and tagged will take longer than the repair B. if the immediate supervisor agrees C. never D. if approved by the unit supervisor

A

C. never

102
Q

What is the source voltage in a circuit that consumes 1200 watts at a current of 5 amps? A. 24 volts B. 110 volts C. 120 volts D. 240 volts

A

D. 240 volts

103
Q

What is the resistance of a 1250 watt, 240 volt rasistive heater? A. 5.2 ohms B. 46.1 ohms C. 48.0 ohms D. 60.0 ohms

A

B. 46.1 ohms

104
Q

When three equal resistors are connected in parallel, the total resistance is? A. the sum of the resistors B. one half of the sum of the resistors C. less than any one resistor D. greater than any two equal resistors

A

C. less than any one resistor

105
Q

A voltage source of a circuit provides 240 volts and draws 48 amps. How much resistance is in the circuit? A. 5 ohms B. 20 ohms C. 25 ohms D. 50 ohms

A

A. 5 ohms

106
Q

What is the formula for calculating total resistance in a series circuit with three resistors? A. RT= R1 -R2 -R3 B. RT= R1 + R2 +R3 C. RT= R1 x R2 x R3 D. R = R1 x R2 x R3

A

B. RT= R1 + R2 + R3

107
Q

Why should the test leads of a megger never be touched by anyone when in use? A. it could result in an electrical shock B. inaccurate readings may result C. the megger could be damaged D. the equipment being tested could be damaged

A

A. it could result in an electrical shock

108
Q

How is a voltmeter connected in a circuit? A. series only B. series or parallel C. parallel only D. series or clamp on

A

C. parallel only

109
Q

The voltage of a DC circuit to be measured. How should the voltmeter be connected to ensure proper polarity? A. The negative terminal of the meter is connected to the negative or low potential point in the circuit. The positive terminal of the meter is connected to the positive or high potential point in circuit. B. The positive terminal of the meter is connected to the negative or low potential point, in the circuit. The negative terminal of the meter is connected to the positive or high potential point in the circuit. C. Only the negative terminal of the voltmeter is required to be connected to the circuit D. Only the positive terminal of the voltmeter is required to be connected to the circuit.

A

A. The negative terminal of the meter is connected to the negative or low potential point in the circuit. The positive terminal of the meter is connected to the positive or high potential point in circuit.

110
Q

What does a wattmeter indicate? A. power factor B. apparant power C. resistance D. true power

A

D. true power

111
Q

Electrical metallic tubing must be supported within what maximum distance from each junction or outlet box? A. 1 foot B. 2 feet C. 3 feet D. 4 feet

A

C. 3 feet

112
Q

A type LB conduit body has the cover on A. the left B. the back C. the right D. both sides

A

B. the back

113
Q

When transporting metal conduit, it is best to A. remove gloves so that they do not contaminate the conduit B. remove thread protection caps so that they do not get lost C. place the metal conduit inside a large raceway to keep it from bending D. keep the thread protection caps on to prevent damage to the threads

A

D. keep the thread protection caps on to prevent damage to the threads

114
Q

The voltage drop of conductors carrying alternating current in PVC conduit will have what relation to that of identical conductors in the conduit? A. more than B. the same as C. less than D. it depends on the conductors

A

B. the same as

115
Q

Several #12-AWG conductors are pulled together. How should they be arranged on the fish tape? A. side by side B. staggered C. criss crossed D. overlapped

A

B. staggered

116
Q

What type of wire is standard for low voltage millamp signal system? A. singal pair shielded B. singal pair C. twinax D. type SIS

A

A. singal pair shielded

117
Q

Cable marking show all of the following except A. wire size B. voltage rating C. number of conductors D. ampacity

A

D. ampacity

118
Q

All of the following are found on an elevation view of a motor control center except the A. location of main breaker B. size of breaker C. location of motor D. starter I.D.

A

C. location of motor

119
Q

The drawing scale is most likely to be found in which of the following drawing locations? A. the lighting fixture schedule B. the symbol list C. the drawing title block D. the power riser diagram

A

C. the drawing title block

120
Q

Receptacles are rated according to the A. amperage only B. voltage and amperage capacity C. wattage consumed D. resistance and voltage

A

B. voltage and amperage capacity

121
Q

What color wire is connected to the silver screw in an incandescent fixture? A. red B. black C. green D. white

A

D. white

122
Q

What is the NEC requirement for labeling disconnects? A. there is no requirement for labeling disconnects B. only new installation disconnects are required to be labeled C. all disconnect devices for circuits, feeders, and equipment must be clearly and permanently marked to show their purpose unless clearly evident D. disconnects must be labeled to indicate the polarity of the device

A

C. all disconnet devices for circuits, feeders, and equipment must be clearly and permanently marked to show their purpose unless clearly evident

123
Q

A three way switch is what type of switch? A. SPST B. DPDT C. DPST D. SPDT

A

D. SPDT

124
Q

The relationship of a transformer primary winding to the secondary winding is expressed in A. wattage B. volt amp C. turns ratio D. total reactance

A

C. turns ratio

125
Q

The number of complete AC cycles per second is called the A. frequency B. sine wave C. potential D. effective value

A

A. frequency

126
Q

The values indicated on a meter for an AC circuit are defined as root mean square. What is another term for this? A. peak value B. average value C. effective value D. sine value

A

C. effective value

127
Q

In a sine wave, the number of times per second an indentical pattern repeats itself is known as the A. distance of a waveform B. height of a waveform C. slope of a waveform D. frequency of a waveform

A

D. frequency of a waveform

128
Q

What does frame size provide information about? A. motor rotation B. proper bolt up C. ambient temperature D. static noise

A

B. proper bolt up

129
Q

What is the voltage ratioe for dual voltage motors? A. 1 to 1 B. 2 to 1 C. 3 to 1 D. 4 to 1

A

B. 2 to 1

130
Q

All parts of a metal cable tray must be bonded together and A. covered B. isolated C. grounded D. metal clad

A

C. grounded

131
Q

The first step in making an exothermic (cadweld) connection is to A. pour the charge into the mold B. prepare the cable, mold, and welding material C. mix in the ignition and melting material D. coat the inside of the mold with oil

A

B. prepare the cable, mold, and welding material

132
Q

Which of the following describes the grounding of metal parts that do not carry current in a distribution system? A. system grounding B. solid grounding C. resistance grounding D. equipment grounding

A

D. equipment grounding

133
Q

Which of the following statements about cadweld molds is true? A. cadweld molds are sized to fit the cable that is being welded B. cadweld molds are designed so that one size fits all cable being welded C. they are only used one time and then must be destroyed D. they are only used one time because they become a part of the weld

A

A. cadweld molds are sized to fit the cable that is being welded

134
Q

Where is nonmetallic conduit (PVC) used? A. above ground only B. below ground only C. both above and below ground D. only in moisture free areas

A

C. both above and below ground

135
Q

What item is utilized to make a 90 degree bend when pulling cable in a cable tray? A. cable roller B. cable reel C. sheave D. mechanical

A

B. cable reel

136
Q

Which of the following determines the pulling force applied to the cable when using a tugger? A. number of raps on the tugger drum B. size of the pulling rope C. size of the wire reel D. speed of the tugger

A

A. number of raps on the tugger drum

137
Q

A conduit piston (mouse) is used for what application? A. cleaning the conduit B. swabbing the conduit C. installing pull line D. installing conductors

A

C. intalling pull line

138
Q

Which of the following is design intended for high tension wire pulls? A. fish tape B. nylon C. polypropylene D. double braided polyester composite

A

B. nylon

139
Q

A section of a cable tray that makes two vertical 90 degree turns is known as A. a horizontal elbow B. an inside vertical elbow C. a vertical tee D. an outside vertical elbow

A

C. a vertical tee

140
Q

When a cable tray system must be protected from sunlight, which of the following should be used? A. cable tray barrier B. solid bottom tray C. vertical riser D. cable tray cover

A

D. cable tray cover

141
Q

What is the maximum voltage of conductors on which wire nuts may be used for interior wiring? A. 250 volts B. 600 volts C. 750 volts D. 875 volts

A

B. 600 volts

142
Q

The terminations on a motor starter are tightened incorrectly. What may occur? A. the motor will pull increased voltage B. the wires will create an arc and increase the amperage the motor is pulling C. the motor will run in reverse D. the motor will only run at half of its rated speed

A

B. the wires will create an arc and increase the amperage the motor is pulling

143
Q

How is metering of electricity accomplished for services rated greater than 400 amps? A. by using PT metering B. by using in line metering C. by using resistance metering D. by using CT metering

A

D. by using CT metering

144
Q

What should be done to change rotation of a 3 phase motor? A. swap any lead B. swap any two leads C. swap any three leads D. swap the red and yellow leads

A

B. swap any two leads

145
Q

What is the typical voltage of a control transformer for a 3 phase, 480 volt starter? A. 24 volts B. 110 volts C. 208 volts D. 240 volts

A

B. 110 volts

146
Q

What is the voltage drop for a 208 V single phase circuit with a load of 26.5 amps, using #8 copper conductor (16,510 circular mils) at a circuit length of 145 feet? A. 9.86 B. 8.24 C. 6.00 D. 5.20

A

C. 6.00

147
Q

All things considered, the most ideal conductor is made of A. bronze B. brass C. aluminum D. copper

A

D. copper

148
Q

Which of the following conductors has the least resistance? A. #2 AWG B. #4 AWG C. #6 AWG D. 1/0 AWG

A

D. 1/0 AWG

149
Q

What part of the motor starter protects the motor if there is a problem in the system? A. contactor B. knife disconnect C. coil D. overload relay

A

D. overload relay

150
Q

Which of the following abbreviations describes the interrupting capacity of circuit breakers or fuses? A. ICA B. UL C. AIC D. AMP

A

D. AMP

151
Q

What is the maximum allowable fill when installing three or more conductors in a conduit? A. 30% B. 40% C. 60% D. 80%

A

B. 40%

152
Q

All of the following apply to the installation of junction boxes, splices boxes, and pull boxes except that they must be A. supported B. accessible C. metal D. sized

A

C. metal

153
Q

A box has two 12/2 with ground cables in it. All like-colored wires have been spliced and pigtailed. How many #12 conductors should be counted in the box fill? A. four B. five C. six D. nine

A

C. six

154
Q

All of the following ratings appear on a circuit breaker nameplate except A. rated voltage B. rated wattage C. rated current D. interrupting rating

A

B. rated wattage

155
Q

The trip rating of a circuit breaker used as the main protective device in a panelboar cannot exceed A. the total amperage of the branch breakers B. the amperage capacity of the branch breakers C. the amperage of the individual branch fuses D. 250 volts

A

A. the total amperage of the branch breakers

156
Q

A transformer has turns ratio of 5.1 . What will be the voltage on the secondary if the primary voltage is 120 volts? A. 24 volts B. 48 volts C. 240 volts D. 600 volts

A

A. 24 volts

157
Q

What is the term for a transformer whose primary and secondary circuit have part of a winding in common? The two circuit are not isolated from each other. A. current transformer B. potential transformer C. auto transformer D. distribution transformer

A

C. auto transformer

158
Q

The purpose of a rectifier is to A. convert DC into AC B. step down voltage C. convert AC into DC D. step up voltage

A

C. convert AC into DC

159
Q

How is a transformer rated for power output? A. watts B. volts C. volt-amperes D. amperage

A

C. volt-amperes

160
Q

Which of the following is the most severe hazardous classification? A. Class III, Division 1 B. Class II, Division 1 C. Class I, Division 2 D. Class I, Division 1

A

D. Class I, Division 1

161
Q

Which of the following types are raceways is approved for use in Class I, Division 1 hazardous location? A. ENT B. PVC (plastic) C. liquid tight conduit D. rigid metal conduit

A

D. rigid metal conduit

162
Q

Which of the following would be found in a Class I location? A. EMT to lights and receptacles B. five threads on conduit connection C. romex connectors and set screws D. threaded two hole straps

A

B. five threads on conduit connection

163
Q

Heat trace cable should never cross itself except when the cable is A. at the middle of the run B. temperature self limited C. at the end of the run D. connected to ground

A

B. temperature self limited

164
Q

According to Ohm’s Law, the amount of current in a circuit is equal to the A. voltage divided by the resistance B. voltage multiplied by the resistance C. resistance minus the voltage D. voltage plus the resistance

A

A. voltage divided by the resistance

165
Q

The force that causes electrons to flow is most commonly called A. current B. resistance C. voltage D. power

A

C. voltage

166
Q

A battery produces voltage using A. electromagnetism B. heat C. chemical action D. pressure

A

C. chemical action

167
Q

A voltage of one vole applied across a resistance of one ohm produces a current of one ampere. If the voltage is doubled and the resistance is halved, then the current A. doubles B. increases four times C. increases three times D. remains the same

A

B. increases four times

168
Q

The total resistance of four resistors in parallel with values of 3, 5, 20, and 50 ohms is _____ohms. A. 1.66 B. 2.54 C. 22 D. 78

A

A. 1.66

169
Q

The total resistance of three resistors in parallel values of 5, 20, and 50 ohms is ____ohms. A. 2.5 B. 3.7 C. 25 D. 75

A

B. 3.75

170
Q

A circuit with a voltage of 120 volts across five resistors in parallel (5, 14, 21, 25, and 100 ohms) has a total current of ____amps. A. 39.3 B. 44.3 C. 50.2 D. 54.3

A

B. 44.

171
Q

An electrical appliance is rated at 1200 watts and is connected to 120 volts. How much current will it draw?

A

amperes = watts/volts I = P/E I = 1200/120 = 10A

172
Q

What is the resistance of an appliance rated at 1200 watts and connected to 120 volts?

A

ohms = volts/ amperes R = E/I R = 120/10 = 12 Ὡ

173
Q

A series circuit is a circuit that

A

has only one path through which the electrons may flow.

174
Q

True or False The total current in a series circuit is equal to the current in any other part of the circuit.

A

True Total current IT = I1 = I2= I3, etc.

175
Q

True or False The total voltage in a series circuit is not equal to the sume of the voltages across all parts of the circuit.

A

False Total voltage ET= E1 + E2 + E3, etc.

176
Q

True or False The total resistance of a series circuit is equal to the sum of the resistance of all parts of the circuit.

A

True Total resistance RT= R1+ R2+ R3, etc.

177
Q

R = ?

A. amperes

B. volts

C. ohms

D. watts

A

C. is correct

R = resistance = ohms

178
Q

I = ?

A. amperes

B. volts

C. ohms

D. watts

A

A. is correct

I = Intensity of current = amperes

179
Q

E = ?

A. amperes

B. volts

C. ohms

D. watts

A

E = electromotive force = volts

B. is correct

180
Q

P = ?

A. amperes

B. volts

C. ohms

D. watts

A

D. is correct

P = power = watts

181
Q
A
182
Q
A
183
Q
A
184
Q
A
185
Q
A
186
Q
A
187
Q
A
188
Q
A
189
Q
A
190
Q
A
191
Q
A
192
Q
A

NCCER electical test (1 decks)

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