Year 3 Electrical Apprenticeship

Question 1

“____” is defined as the shortest distance in inches measured between a point on the top surface of any direct-buried conductor, cable, conduit, or other raceway and the top surface of finished grade, concrete, or similar cover.

Answer 1

cover

Question 2

A circuit has two capacitors in series. If CT =16μF and C1=25μF, what is the value of C2?

Answer 2

50μF

Question 3

What is the primary voltage for all dry type transformers in the figure? (missing picture)

Answer 3

480 v

Question 4

What type of study is required to complete an arc flash hazard analysis, including the arc flash boundary and incident energy at a point in an electrical system?

Answer 4

short circuit current study

Question 5

The most important factor used to determine the best place to attach to and lift a load is the load’s _______?

Answer 5

center of gravity

Question 6

A change to the original blueprints or specifications is accomplished by _________?

Answer 6

Submitting an addendum

Question 7

The maximum size copper electrode conductor required by the National Electrical Code to ground aa rod, pipe, or plate electrode is ______?

Answer 7

No. 6 AWG

Question 8

Knots that are used to tie the ends of two ropes together are called ________?

Answer 8

Bends

Question 9

In general, an insulated grounded conductor of ________ or smaller shall be identified by a continuous white or gray outer finish or by three continuous white stripes on other than green insulation along its entire length.

Answer 9

6 AWG

Question 10

A boom is a long beam that projects from the main part of a crane to ________ the reach of the hoist

Answer 10

Extend

Question 11

In grounded systems, an unspliced _______ connects the equipment grounding conductor and the service-disconnected enclosure to the system’s grounded conductor at each service disconnect.

Answer 11

Main Bonding Jumper

Question 12

In a pure capacitive circuit, current will _________ the voltage by _______

Answer 12

lead/90 degrees

Question 13

Which of the following terms describes the maximum tension that a rigging component may be subjected to while maintaining an appropriate margin of safety?

Answer 13

Rated Load

Question 14

What is the maximum number of 6 AWG conductors that may be installed in the 6 x 4 x 2 inch pull?

Answer 14

9

Question 15

A coil has an impedance (XL) of 188.4 ohms and an internal resistance (R) of 82 ohms. If the coil is connected to a 120-volt, 60-hertz source, what will be the current through the coil?

Answer 15

.58 A

Question 16

What is the total impedance (ZT) in the circuit? The picture is a rectangle with 240 VAC and 60 Hz on the side with the squiggly S in a circle (left side), 25 Upside down horseshoe with a pointy zig zag line on the top side, and a 30 with an upside down horseshoe on the right side with a straight line end and a half circle meeting a line on the other. There was no label on the bottom line. (Missing Picture)

Answer 16

39 ohms

Question 17

Resonance is defined as the _________ at which inductive reactance is equal to capacitive reactance

Answer 17

Frequency

Question 18

A ________ condition represents low impedance fault with the highest level of fault current

Answer 18

bolted fault

Question 19

What signal must be given when the load must remain at a constant elevation and move horizontally closer to the crane as the boom is raised

Answer 19

Raises the boom lower the load

Question 20

Three capacitors having values of 10 microfarads, 25 microfarads, and 40 microfarads are connected in the series. What is the total capacitance of the circuit?

Answer 20

6 microfarads

Question 21

exposed non-current-carrying metal parts of fixed equipment supplied by or enclosing conductors are likely to become energized and be connected to an equipment grounding conductor where within _______ vertically or ________ horizontally of ground or grounded metal objects and subject to contact by persons

Answer 21

8 ‘ / 5 ‘

Question 22

What kind of crane includes a hoist trolley that travels along a horizontal beam on overhead runways?

Answer 22

Overhead

Question 23

Under most circumstances, if the answer to a question or problem cannot be found on the blueprint drawings, it can be found in the _____

Answer 23

NEC

Question 24

The firgure represents a(n) __________? (Missing picture)

Answer 24

Fire alarm-voice/data/video systems?

Question 25

What is the name of the structure that extends from the platform of a mobile crane for the purpose of stabilizing the crane?

Answer 25

Outrigger

Question 26

To get an overview of the job to be constructed, one should consult the _________

Answer 26

Site Plan

Question 27

The NEC allows an underground metallic water pipe to be used as a grounding electrode as long as it has direct contact with the earth for _______

Answer 27

10'

Question 28

When looking to see where lighting fixtures will be installed in a T-bar ceiling, one would check the _______

Answer 28

Floor Plan

Question 29

For greater strength and permanence (approximately 85% to 90% of the rope itself), a _______ is used for fastening two ropes together?

Answer 29

Splice

Question 30

Type ______ cable is a factory assembly of one or more insulated circuit conductors with or without optical fiber members enclosed in an armor of interlocking metal tape, or a smooth or corrugated metallic sheath.

Answer 30

MC

Question 31

In both exposed and concealed locations, where a cable or raceway-type wiring method is installed through bored holes in joists, rafters, or wood members, holes shall be bored so that the edge of the hole is not less than ______ from the nearest edge of the wood member

Answer 31

1 1/4 Inches

Question 32

The sheepshank is primarily used to __________

Answer 32

Temporarily shorten rope without cutting it

Question 33

A lighting panel is protected by 150-ampere non-0timed delay fuses. What is the minimum size of the aluminum equipment grounding conductor?

Answer 33

4 AWG

Question 34

What is the name of the boundary that an individual worker must observe before he or she works on an energized electrical conductor that has not been placed in an electrically safe work condition?

Answer 34

Limited Approach

Question 35

Identify the formula: IT=square root of (IR^2 + Ix^2) | ```

Answer 35

Total Current in a Series AC Circuit

Question 36

A drawing that shows the conduit size, the number of conductors, panel locations, and how the feeders are run is called the _________

Answer 36

Riser DIagram

Question 37

The knot illustrated is a ________ (missing picture)

Answer 37

Bowline

Question 38

Where insulating fittings or insulating materials are used with conduits, they shall have a temperature rating _______ the insulation temperature rating of the installed conductors

Answer 38

Not Less Than

Question 39

Where installed in _______ locations, Type TC cable shall also be resistant to moisture and corrosive agents.

Answer 39

Wet

Question 40

According to industry recognized practices, the first step in reading a set of commercial prints is to examine the ______

Answer 40

Cover sheet for data and print designations

Question 41

A subpanel in a commercial installation shall have the grounding terminal and neutral bar _______?

Answer 41

Isolated with only grounding terminal bonded to the enclosure

Question 42

Where Type NM cable is run at angles with joists in unfinished basements, it shall be permissible to secure cables not smaller than two _____ or three ______ conductors directly to the lower edges of the joists. Smaller cables shall either be run through bored holes in joists or on running boards

Answer 42

6 awg / 8 awg

Question 43

When using a sling, what is the minimum recommended sling angle?

Answer 43

30 degrees

Question 44

If 10 equal size electric heater strips are connected in parallel with a 120 volt circuit, and the total circuit current is 8.33 amperes, what is the wattage of each heater strip

Answer 44

100 w

Question 44

The maximum current that a fuse or circuit breaker can safely interrupt under standard test conditions is called the _________

Answer 44

Interrupting rating

Question 45

When applying the (not over) 25 feet long feeder tap rule, conductors shall be permitted to be tapped, without overcurrent protection at the tap, to a feeder provided the ampacity of the tap conductors is not less than ________ of the rating of the overcurrent device protecting the feeder conductors

Answer 45

1/3

Question 46

When branch conductors are increased in size to compensate for voltage drop, the sizing of the equipment grounding conductor is ________

Answer 46

Adjusted proportionally to the branch conductors

Question 47

A grounding terminal and neutral bar are tied together at ______

Answer 47

An Auto transformer

Question 48

The characteristic of a fuse in which higher percentage overcurrent faults open faster than lower percentage faults is called the _____

Answer 48

Inverse Time current characteristic

Question 49

When a circuit breaker trips due to a fault current that approaches the interrupting rating of the circuit breaker, what does the NFPA 70E standard 225.3 require be done?

Answer 49

Inspect and test the circuit breaker

Question 50

How many breakers are in panel DP? (missing picture)

Answer 50

6

Question 51

Which of the following is not considered a common electrical hazard associated with working on or near energized electrical equipment?

Answer 51

Chelation

Question 52

The figure represents an _______ (Missing picture)

Answer 52

Reflected Ceiling Plan?

Question 52

In a 3-phase delta system the line current is _____ times the phase current

Answer 52

1.73

Question 53

What is the total resistance of a circuit containing a branch of three parallel 15 - kiloohms resistors in series with a branch of two parallel resistors (1000 ohms and 250 ohms)

Answer 53

5.20 kohms

Question 54

What does the variable x represent in the formula: X = watts/volts-amps

Answer 54

Power factor

Question 55

Occupational Safety and Health (OSHA) requirements state that only ______ persons may work on electric circuit parts or equipment that have not been deenergized

Answer 55

Qualified

Question 56

Where solid rock prevents compliance with the minimum cover depths specified in table 300.5 of the NEC, the wiring shall be installed in metal or nonmetallic raceway permitted for direct burial. The raceways shall be covered by a minimum of _______ concrete extending down to rock

Answer 56

2"

Question 57

What type of jumper is required to connect the grounding terminal of a grounding-type receptacle to a metal enclosure?

Answer 57

Equipment Bonding Jumper

Question 58

The grounding electrode conductor in an alternating current system must be sized no less than ______

Answer 58

The listing in table 250.66 of the NEC

Question 59

The low opposition to current for all grounding or grounded conductors is primarily affected by the system's ______

Answer 59

Impedence

Question 59

When referring to the specifications for a construction project, in which section of the specifications is information relating to electrical installations located?

Answer 59

Division 16

Question 60

According to the NEC, aluminum electrode conductors used to ground a rod, pipe, or plate electrode should be no larger than _____ AWG

Answer 60

No. 4

Question 61

The primary purpose of ground-fault circuit-interrupter protection is to protect personnel against which one of the following?

Answer 61

Faults

Question 62

All 125- volt receptacles located within ________ from the inside walls of a permanently installed pool shall be protected by a ground-fault circuit interrupter

Answer 62

20 '

Question 63

The voltage across a capacitor that is charging from a direct current supply will increase _______ for each time constant

Answer 63

63.2%

Question 64

The minimum size copper equipment grounding conductor required for a branch circuit protected by a 60-ampere fuse is a _______

Answer 64

10 AWG

Question 65

All bend of type AC cable shall be made so that the cable will not be damaged, and the radius of the curve of the inner edge of any bend shall not be less than _____ times the diameter of the type AC cable

Answer 65

5

Question 66

The grounded conductor for copper service-entrance conductors that are larger than 1100 kcmil shall not be less than ______ of the area of the largest service entrance phase conductor

Answer 66

12 1/2

Question 67

Identify the item: S(subscript K) : SK

Answer 67

Keyed Switch

Question 67

A ____ is a wheel with a concave edge for supporting a moving rope that is changing direction

Answer 67

Sheave

Question 68

What is the total impedance (ZT) in the circuit? (MIssing picture)

Answer 68

760.21

Question 69

Four branch circuits are installed in the same conduit leaving a distribution panel. One has 15-amp protection, one has 20-amp protection, one has 30-amp protection, and one has 40-amp protection. What is the minimum size of the aluminum equipment ground in the home-run conduit?

Answer 69

8 awg

Question 70

The service entrance aluminum conductors are 750 kcmil for a 3-phase, 120/208 volt, 4-wire system. What is the minimum size of the aluminum grounding electrode conductor to a pipe electrode?

Answer 70

4 awg

Question 71

When a copper conductor is used as a grounding electrode conductor, it must be protected if it is smaller than _____ AWG

Answer 71

6

Question 72

Electrical nonmetallic tubing (ENT) shall be installed as a complete system and shall be securely fastened in place at intervals not exceeding ______. In addition, ENT shall be securely fastened in place within ________ of each outlet or device box, junction box, cabinet, or fitting where it terminates

Answer 72

3'/3'

Question 73

A subpanel in a residential installation shall have the grounding terminal and neutral bar _______

Answer 73

Isolated with only the ground terminal bonded to the enclosure

Question 74

In a 3-phase wye system the line current is ______ times the phase current

Answer 74

1.73

Question 75

Which one of the following National Fire Protection Association documents is titled the "Standard for Electrical Safety in the Workplace"?

Answer 75

70E

Question 76

The figure represents a ______ Missing picture

Answer 76

HVAC Plan

Question 77

A(n) _______ person, according to OSHA, is "one who is capable of identifying existing and predictable hazards in the surroundings or working conditions which are unsanitary, hazardous, or dangerous to employees, and who has authorization to take prompt corrective measures to eliminate them."

Answer 77

Competent

Question 78

A lighting panel is protected by a 150-ampere circuit breaker. What is the minimum size of the copper equipment grounding conductor?

Answer 78

6 awg

Question 79

A detailed list of job requirements covering all work that is to be performed is called a(n) _______?

Answer 79

Specification

Question 80

When scaled on an electrical blueprint, a conduit stub-up measures 3 5/8 inches from a wall. If the stub-up is actually supposed to be located 14.5 feet from the wall, what is the correct scale for this blueprint?

Answer 80

¼"=1'

Question 81

A parallel RC circuit has a true power of 2420 watts and an apparent power of 3102 volt amps. What is the power factor in percent?

Answer 81

78%

Question 82

One horsepower is equal to _____

Answer 82

746 w

Question 83

A commonly used knot that does not slip, jam, or fail, is easily tied and untied, and has many uses is the ______

Answer 83

Bowline

Question 84

The primary purpose of the main bonding jumper is to _______

Answer 84

Carry the ground fault current back to the source

Question 85

Determine the minimum number of 120 volt, 15 ampere lighting circuits required for a dwelling unit with a computed lighting load of 16000 volt amps

Answer 85

5

Question 86

Occupational Safety and Health Administration (OSHA) requirements state that while any employee is exposed to contact with parts of fixed electric equipment or circuits which have been deenergized, the circuits energizing the parts shall be ______ or tagged or both

Answer 86

Locked out

Question 87

The figure represents an _______ (missing picture)

Answer 87

Feeder Riser Diagram

Question 88

The service entrance copper conductors are 750 kcmil for a 3phase, 120/208 volt 4 wire system. Given this information, what is the minimum size of the copper grounding electrode conductor to a metal water pipe?

Answer 88

2/0 awg

Question 89

NEC 110.24 (with exceptions) requires that the maximum available fault current be marked on ______

Answer 89

Service equipment

Question 90

The provisions in Article 300 are not intended to apply to the conductors that form an integral part of equipment, such as motors, controllers, motor control centers, or factory assembled control equipment or ______ utilization equipment

Answer 90

Listed

Question 91

The minimum size of the copper main bonding jumper for a service that consists of one 350 kcmil copper conductor per phase is ______

Answer 91

2/0 awg

Question 92

The hand signal in the figure is used to tell the crane operator to ______ (picture is of a guy facing you with his right (your left) arm sticking out and pointing his thumb down and other hand to his side

Answer 92

Lower the boom

Question 93

A continuous load is where the maximum current is expected to continue for _____ or more

Answer 93

3 hours

Question 94

What is the minimum size AWG copper conductor permitted for conductors with a 0 through 2000 volt voltage rating?

Answer 94

No. 14

Question 95

Which item is a suitable grounding electrode?

Answer 95

A 20 foot no. 4 copper conductor encased in 12" of concrete

Question 96

The hand signal in the figure is used to tell the crane operator to _____ (missing picture)

Answer 96

Stop