Year 3 Electrical Apprenticeship Flashcards
“____” 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.
cover
A circuit has two capacitors in series. If CT =16μF and C1=25μF, what is the value of C2?
50μF
What is the primary voltage for all dry type transformers in the figure? (missing picture)
480 v
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?
short circuit current study
The most important factor used to determine the best place to attach to and lift a load is the load’s _______?
center of gravity
A change to the original blueprints or specifications is accomplished by _________?
Submitting an addendum
The maximum size copper electrode conductor required by the National Electrical Code to ground aa rod, pipe, or plate electrode is ______?
No. 6 AWG
Knots that are used to tie the ends of two ropes together are called ________?
Bends
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.
6 AWG
A boom is a long beam that projects from the main part of a crane to ________ the reach of the hoist
Extend
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.
Main Bonding Jumper
In a pure capacitive circuit, current will _________ the voltage by _______
lead/90 degrees
Which of the following terms describes the maximum tension that a rigging component may be subjected to while maintaining an appropriate margin of safety?
Rated Load
What is the maximum number of 6 AWG conductors that may be installed in the 6 x 4 x 2 inch pull?
9
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?
.58 A
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)
39 ohms
Resonance is defined as the _________ at which inductive reactance is equal to capacitive reactance
Frequency
A ________ condition represents low impedance fault with the highest level of fault current
bolted fault
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
Raises the boom lower the load
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?
6 microfarads
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
8 ‘ / 5 ‘
What kind of crane includes a hoist trolley that travels along a horizontal beam on overhead runways?
Overhead
Under most circumstances, if the answer to a question or problem cannot be found on the blueprint drawings, it can be found in the _____
NEC
The firgure represents a(n) __________? (Missing picture)
Fire alarm-voice/data/video systems?
What is the name of the structure that extends from the platform of a mobile crane for the purpose of stabilizing the crane?
Outrigger
To get an overview of the job to be constructed, one should consult the _________
Site Plan
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 _______
10’
When looking to see where lighting fixtures will be installed in a T-bar ceiling, one would check the _______
Floor Plan
For greater strength and permanence (approximately 85% to 90% of the rope itself), a _______ is used for fastening two ropes together?
Splice
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.
MC
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
1 1/4 Inches
The sheepshank is primarily used to __________
Temporarily shorten rope without cutting it
A lighting panel is protected by 150-ampere non-0timed delay fuses. What is the minimum size of the aluminum equipment grounding conductor?
4 AWG
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?
Limited Approach
Identify the formula: IT=square root of (IR^2 + Ix^2)
```
Total Current in a Series AC Circuit
A drawing that shows the conduit size, the number of conductors, panel locations, and how the feeders are run is called the _________
Riser DIagram
The knot illustrated is a ________ (missing picture)
Bowline
Where insulating fittings or insulating materials are used with conduits, they shall have a temperature rating _______ the insulation temperature rating of the installed conductors
Not Less Than
Where installed in _______ locations, Type TC cable shall also be resistant to moisture and corrosive agents.
Wet
According to industry recognized practices, the first step in reading a set of commercial prints is to examine the ______
Cover sheet for data and print designations
A subpanel in a commercial installation shall have the grounding terminal and neutral bar _______?
Isolated with only grounding terminal bonded to the enclosure
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
6 awg / 8 awg
When using a sling, what is the minimum recommended sling angle?
30 degrees
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
100 w
The maximum current that a fuse or circuit breaker can safely interrupt under standard test conditions is called the _________
Interrupting rating
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
1/3
When branch conductors are increased in size to compensate for voltage drop, the sizing of the equipment grounding conductor is ________
Adjusted proportionally to the branch conductors
A grounding terminal and neutral bar are tied together at ______
An Auto transformer
The characteristic of a fuse in which higher percentage overcurrent faults open faster than lower percentage faults is called the _____
Inverse Time current characteristic
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?
Inspect and test the circuit breaker
How many breakers are in panel DP? (missing picture)
6
Which of the following is not considered a common electrical hazard associated with working on or near energized electrical equipment?
Chelation
The figure represents an _______ (Missing picture)
Reflected Ceiling Plan?
In a 3-phase delta system the line current is _____ times the phase current
1.73
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)
5.20 kohms
What does the variable x represent in the formula: X = watts/volts-amps
Power factor
Occupational Safety and Health (OSHA) requirements state that only ______ persons may work on electric circuit parts or equipment that have not been deenergized
Qualified
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
2”
What type of jumper is required to connect the grounding terminal of a grounding-type receptacle to a metal enclosure?
Equipment Bonding Jumper
The grounding electrode conductor in an alternating current system must be sized no less than ______
The listing in table 250.66 of the NEC
The low opposition to current for all grounding or grounded conductors is primarily affected by the system’s ______
Impedence
When referring to the specifications for a construction project, in which section of the specifications is information relating to electrical installations located?
Division 16
According to the NEC, aluminum electrode conductors used to ground a rod, pipe, or plate electrode should be no larger than _____ AWG
No. 4
The primary purpose of ground-fault circuit-interrupter protection is to protect personnel against which one of the following?
Faults
All 125- volt receptacles located within ________ from the inside walls of a permanently installed pool shall be protected by a ground-fault circuit interrupter
20 ‘
The voltage across a capacitor that is charging from a direct current supply will increase _______ for each time constant
63.2%
The minimum size copper equipment grounding conductor required for a branch circuit protected by a 60-ampere fuse is a _______
10 AWG
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
5
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
12 1/2
Identify the item: S(subscript K) : SK
Keyed Switch
A ____ is a wheel with a concave edge for supporting a moving rope that is changing direction
Sheave
What is the total impedance (ZT) in the circuit? (MIssing picture)
760.21
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?
8 awg
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?
4 awg
When a copper conductor is used as a grounding electrode conductor, it must be protected if it is smaller than _____ AWG
6
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
3’/3’
A subpanel in a residential installation shall have the grounding terminal and neutral bar _______
Isolated with only the ground terminal bonded to the enclosure
In a 3-phase wye system the line current is ______ times the phase current
1.73
Which one of the following National Fire Protection Association documents is titled the “Standard for Electrical Safety in the Workplace”?
70E
The figure represents a ______ Missing picture
HVAC Plan
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.”
Competent
A lighting panel is protected by a 150-ampere circuit breaker. What is the minimum size of the copper equipment grounding conductor?
6 awg
A detailed list of job requirements covering all work that is to be performed is called a(n) _______?
Specification
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?
¼”=1’
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?
78%
One horsepower is equal to _____
746 w
A commonly used knot that does not slip, jam, or fail, is easily tied and untied, and has many uses is the ______
Bowline
The primary purpose of the main bonding jumper is to _______
Carry the ground fault current back to the source
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
5
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
Locked out
The figure represents an _______ (missing picture)
Feeder Riser Diagram
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?
2/0 awg
NEC 110.24 (with exceptions) requires that the maximum available fault current be marked on ______
Service equipment
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
Listed
The minimum size of the copper main bonding jumper for a service that consists of one 350 kcmil copper conductor per phase is ______
2/0 awg
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
Lower the boom
A continuous load is where the maximum current is expected to continue for _____ or more
3 hours
What is the minimum size AWG copper conductor permitted for conductors with a 0 through 2000 volt voltage rating?
No. 14
Which item is a suitable grounding electrode?
A 20 foot no. 4 copper conductor encased in 12” of concrete
The hand signal in the figure is used to tell the crane operator to _____ (missing picture)
Stop
