Final Test 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.
A) Buried
B) Concealed
C) Cover
D) Submerged
Cover
A circuit has two capacitors in series. If C(T) = 16.67 uF and C(1) = 25 uF, what is the value of C(2)?
A) 25 uF
B) 40 uF
C) 50 uF
D) 75 uF
50 uF
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 the electrical system?
A) coordination study
B) load flow study
C) power quality study
D) short-circuit current study
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 ___.
A) center of gravity
B) density
C) height
D) weight
center of gravity
A change to the original blueprints or specifications is accomplished by ___
A) performing the required work as needed
B) submitting an addendum
C) submitting a change order
D) updating the as-built drawings
submitting an addendum
The maximum size copper electrode conductor required by the NEC to a ground rod, pipe, or plate electrode is ___
A) #6 AWG
B) #4 AWG
C) #3 AWG
D) 1/0 AWG
6 AWG
250.66(A)
Knots that are used to tie the ends of two ropes together are called ___
A) bends
B) hitches
C) loops
D) splices
Bends
In general, an insulated grounded conductor of ___ or smaller shall be identified by a continuous white or grey outer finish or by three continuous white stripes on other then green insulation along its entire length.
A) 2/0 AWG
B) 1/0 AWG
C) #1 AWG
D) #6 AWG
6 AWG
A boom is a long beam that projects from the main part of a crane to ___ the reach of the hoist
A) extend
B) lower
C) raise
D) shorten
extend
In grounded systems, an unspliced ___ connects the equipment grounding conductor and the service-disconnect enclosure to the system’s grounded conductor at each service disconnect.
A) grounding conductor
B) grounding electrode
C) isolated conductor
D) main bonding jumper
main bonding jumper
In a pure capacitive circuit, current will ___ the voltage by ___ degrees
A) lag / 90
B) lag / 120
C) lead / 90
D) lead / 120
lead / 90
Which of the following terms describes the maximum tension that a rigging component may be subjected to while maintaining an appropriate margin of safety?
A) breaking strength
B) rated load
C) safety factor
D) ultimate strength
rated load
What is the maximum number of #6 AWG conductors that may be installed in a 6” x 4” x 2” pull box?
A) 6
B) 9
C) 12
D) 14
9
Table 314.16(B)
A coil has impedance of of 188.4 ohms and an internal resistance of 82 ohms. If the coil is connected to a 120-volt, 60hz source, what will be the current through the coil?
A) 0.42 A
B) 0.58 A
C) 0.63 A
D) 1.46 A
0.58 A
What is the total impedance of a circuit containing a 25 ohm resistor and a 30 ohm capacitor fed from a 240VAC 60hz source
A) 30 ohms
B) 39 ohms
C) 45 ohms
D) 52 ohms
39 ohms
Resonance is described as the ___ at which inductive reactance is equal to capacitive reactance.
A) bandwitch
B) frequency
C) phase
D) voltage
frequency
A ___ condition represents low impedance fault with the highest level of fault current.
A) arcing fault
B) bolted fault
C) grounded fault
D) phase-to-phase fault
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
A) lower boom
B) raise boom
C) lower boom raise load
D) raise boom lower load
raise boom lower load
Three capacitors having values of 10 uF, 25 uF, and 40 uF are connected in series. What is the total capacitance of the circuit?
A) 3 uF
B) 6 uF
C) 9 uF
D) 12 uF
6 uF
Exposed non-current-carrying metal parts of fixed equipment supplied by or enclosing conductors that are likely to become energized shall be connected to an equipment grounding conductor where within ___ vertically or ___ horizontally of ground of grounded metal objects and subject to contact by persons
A) 5’ / 5’
B) 5’ / 8’
C) 8’ / 5’
D) 8’ / 8’
8’ / 5’
What kind of crane includes a hoist trolley that travels along a horizontal beam on overhead runways?
A) gantry
B) mobile
C) overhead
D) tower
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 ___
A) as-built drawings
B) detail drawings
C) job specifications
D) NEC
NEC
What is the name of the structure that extends from the platform of a mobile crane for the purpose of stabilizing the crane?
A) base structure
B) outrigger
C) stability pad
D) support leg
outrigger
To get an overview of the job to be constructed, one should consult the ___
A) elevation plans
B) floor plan
C) panel schedule
D) site plan
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 ___
A) 2’
B) 5’
C) 10’
D) 18’
10’
When looking to see where lighting fixtures will be installed in a T-bar ceiling, one would check the ___
A) floor plan
B) lighting drawing
C) lighting schedule
D) reflected ceiling drawing
Reflected Ceiling
For greater strength and permanence (~85-90% of the rope itself) a ___ is used for fastening two ropes together
A) crimp
B) hitch
C) splice
D) weaver’s knot
splice
Type ___ cable is a factory assembly of one or more insulted circuit conductors with or without optical fiber members enclosed in an armor of interlocking metal tape, or a smooth or corrugated metallic sheath
A) AC
B) MC
C) MI
D) NMS
MC
In both exposed and concealed locations, where cable or raceway type wiring method is installed through bored holes in joists, rafter 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.
A) 1”
B) 1 1/4”
C) 2 1/2”
D) 3”
1 1/4”
The sheepshank is primarily used to ___
A) attach a rope to a hook for pulling loads
B) form a seat for raising or lowering people
C) temporarily shorten a rope without cutting it
D) tow or hoist conduit
temporarily shorted rope without cutting it
A lighting panel is protected by 150-ampere non time delay fuses. What is the minimum size of the equipment grounding conductor
A) #8 AWG
B) #6 AWG
C) #4 AWG
D) #3 AWG
6 AWG
Table 250.122
What is the name of the boundary that an individual worker must observe before they work on an energized electrical conductor that has not been placed in an electrically safe work condition
A) Arc blast approach
B) limited approach
C) prohibited approach
D) shock-hazard approach
limited approach
Identify the formula:
I(t) = Sqrt( I(r)^2 + I(x)^2 )
A) Total current in a parallel AC circuit
B) Total current in a parallel DC circuit
C) Total current in a series AC circuit
D) Total current in a series DC circuit
Total current in a series AC circuit
A drawing that shows conduit size, number of conductors, panel locations, and how the feeders are run is called the ___
A) floor plan
B) panel schedule
C) riser diagram
D) site plan
riser diagram
Where insulating fittings or insulating materials are used with conduits, they shall have a temperature rating ___ the insulation temperature rating of the installed conductors
A) equal to
B) equivalent to
C) greater than
D) not less than
not less than
Where installed in ___ locations, type TC cable shall also be resistant to moisture and corrosive agents
A) damp
B) dry
C) outdoor
D) wet
wet
According to industry recognized practices, the first step in reading a set of commercial prints is to examine the ___
A) addendums
B) cover sheet for dates and print designations
C) electrical drawings
D) site and architectural plans
cover sheet for dates and print designations
A subpanel in a commercial installation shall have the grounding terminal and neutral bar ___
A) bonded together and bonded to the enclosure
B) bonded together but not bonded to the enclosure
C) isolated with only the grounding terminal bonded to the enclosure
D) isolated with only the neutral bar bonded to the enclosure
Isolated with only the 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 edge of the joists. Smaller cables shall either be run through bored holes in joists or on running boards.
A) #6 AWG / #8 AWG
B) #8 AWG / #10 AWG
C) #10 AWG / #12 AWG
D) #12 AWG / #14 AWG
6 AWG / #8 AWG
When using a sling, what is the minimum recommended sling angle?
A) 30 degrees
B) 60 degrees
C) 90 degrees
D) 120 degrees
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?
A) 50W
B) 72W
C) 100W
D) 144W
100W
The maximum current that a fuse or circuit breaker can safely interrupt under standard test conditions is called the ___
A) ampere rating
B) interrupting rating
C) maximum available fault current rating
D) withstanding rating
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 protection device protecting the feeder conductors.
A) 1/8
B) 1/4
C) 1/3
D) 1/2
1/3
When branch conductors are increased in size to compensate for voltage drop, the sizing of the equipment grounding conductor is ___
A) adjuster proportionally to the branch conductors
B) increased to the next standard size
C) not increased
D) sized to 100% of the ungrounded conductor size
adjusted proportionally to the branch conductors
A grounding terminal and neutral bar are tied together at ___
A) a subpanel
B) an autotransformer
C) the main panel
D) the meter hub
an autotransformer
The characteristic of a fuse in which higher percentage overcurrent faults open faster than lower percentage faults is called the ___
A) converse time-current characteristic
B) fault time-current characteristic
C) inverse time-current characteristic
D) overload time-current characteristic
inverse time-current characteristic
When a circuit breaker trips due to a fault that approaches the interrupting rating of the circuit breaker, what does the NFPA 70E standard 225.3 require be done?
A) Replace the breaker
B) Clean and reset the breaker
C) Inspect and reset the breaker
D) Inspect and test the breaker
Inspect and test the breaker
Which of the following is not considered a common electrical hazard associated with working on or near energized electrical equipment?
A) Arc blast
B) Arc flash
C) Chelation
D) Shock
Chelation
In a 3-phase delta system the line current is ___ times the phase current.
A) 0.58
B) 1
C) 1.73
D) 3
1.73
What is the total resistance of a circuit containing a branch of three parallel 15 kiloohm resistors in series with a branch of two parallel resistors of 1000 ohms and 250 ohms?
A) 4.80 kohm
B) 5.20 kohm
C) 43.75 kohm
D) 46.25 kohm
5.20 kohm
What does X represent in the following formula?
X = (Watts) / (Volts-Amps)
A) Current
B) Power Factor
C) Resistance
D) Voltage
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
A) authorized
B) competent
C) qualified
D) recognized
qualified
Where solid rock prevents compliance with 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 raceway shall be covered by a minimum of ___ of concrete extending down to rock.
A) 2”
B) 4”
C) 6”
D) 12”
2”
What type of jumper is required to connect the grounding terminal of a grounding type receptacle to a metal enclosure?
A) A main bonding jumper
B) A supplemental bonding jumper
C) An equipment bonding jumper
D) An isolated bonding jumper
An equipment bonding jumper
The grounding electrode conductor in an alternating current system must be sized no less than ___.
A) The listing in table 250.66 of the NEC
B) The listing in table 250.122 of the NEC
C) 70% of the ungrounded conductors
D) 100% ungrounded conductors
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 ___
A) ambient temperature
B) impedance
C) phase angle
D) power factor
Impedance
When referring to the specifications for a construction project, in which section of the specifications is information relating to electrical installations located?
A) Division 1
B) Division 11
C) Division 15
D) Division 16
Division 16
According to the NEC, aluminum electrode conductors used to ground a rod, pipe, or plate electrode should be no larger than ___ AWG
A) #6
B) #4
C) #3
D) 1/0
4
The primary purpose of ground-fault circuit-interrupter protection is to protect personnel against which of the following
A) faults
B) overcurrent
C) overload
D) shock
faults
All 125-volt receptacles located within ___ from the inside walls of a permanently installed pool shall be protected by a GFCI
A) 5’
B) 10’
C) 15’
D) 20’
20’
The voltage across a capacitor that is chraging from a DC supply will increase ___ for each time constant
A) 20%
B) 63.2%
C) 99.3%
D) 100%
63.2%
The minimum size copper equipment grounding conductor required for a branch circuit protected by a 60-ampere fuse is a ___
A) 12 AWG
B) 10 AWG
C) 8 AWG
D) 6 AWG
10 AWG
Table 250.122
All bends 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 diamater of the type AC cable
A) 2
B) 5
C) 7
D) 10
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
A) 10%
B) 12.5%
C) 50%
D) 70%
12.5%
Identify the item:
(‘S’ sub ‘k’)
A) keyed switch
B) knife switch
C) surface mounted switch
D) switch with pilot light
keyed switch
A ___ is a wheel with a concave edge for supporting a moving rope that is changing direction
A) block
B) gin
C) sheave
D) tackle
Sheave
What is the total impedance in a circuit with a 100 ohm resistor and a 2 henry inductor (series) fed by a 120 VAC 60hz supply
A) 746.94 ohm
B) 753.60 ohm
C) 760.21 ohm
D) 776.10 ohm
760.21 ohm
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?
A) 14 AWG
B) 12 AWG
C) 10 AWG
D) 8 AWG
8 AWG
Table 250.122
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?
A) 6 AWG
B) 4 AWG
C) 2 AWG
D) 2/0
4 AWG
250.66(A)
When a copper conductor is used as a grounding electrode conductor, it must be protected if it is smaller than ___ AWG
A) 10
B) 8
C) 6
D) 4
6
250.64(B)(1)
Electrical nonmetallic tubing 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.
A) 3’ / 3’
B) 3’ / 4 1/2’
C) 4 1/2’ / 4 1/2’
D) 4 1/2’ / 6’
3’ / 3’
A subpanel in a residential installation shall have the grounding terminal and neutral bar ___
A) bonded together and bonded to the enclosure
B) bonded together but not bonded to the enclosure
C) isolated with only the grounding terminal bonded to the enclosure
D) isolated with only the neutral bar bonded to the enclosure
Isolated with only the ground terminal bonded to the enclosure
In a 3-phase wye system the line current is ___ times the phase current
A) 0.58
B) 1
C) 1.73
D) 3
1.73
Which one of the following National Fire Protection Association documents is titled the ‘Standard for Electrical Safety in the Workplace’
A) 70E
B) EIA/TIA
C) IEEE
D) White Book
70E
A ___ 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’
A) authorized
B) certified
C) competent
D) qualified
competent
A lighting panel is protected by a 150-ampere circuit breaker. What is the minimum size of the copper equipment grounding conductor?
A) 8 AWG
B) 6 AWG
C) 4 AWG
D) 3 AWG
6 AWG
Table 250.122
A detailed list of job requirements covering all work that is to be performed is called a ___
A) addendum
B) bid drawing
C) schedule
D) specification
specification
When scaled on an electrical blueprint, a conduit stub-up measure 3 5/8” 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?
A) 1/8” = 1’
B) 1/4” = 1’
C) 1/2” = 1’
D) 5/8” = 1’
1/4” = 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?
A) 39.3%
B) 62.4%
C) 78%
D) 91.2%
78%
One horsepower is equal to ___
A) 467 W
B) 674 W
C) 746 W
D) 764 W
746 W
A commonly used knot that does not slip, jam, or fail, is easily tied and untied, and has many uses is the ___
A) bowline
B) cat’s paw
C) sheepshank
D) square knot
bowline
The primary purpose of the main bonding jumper is to ___
A) carry the ground-fault back to the source
B) isolate the neutral form the ground
C) maintain a high resistance to ground on the service enclosure
D) prevent a separately derived service system.
carry the ground-fault 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
A) 2
B) 5
C) 7
D) 9
5
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
A) locked out
B) marked sufficiently
C) readily identified
D) strategically located
locked out
The service entrance copper conductors are 750 kcmil for a 3-phase, 120/208 bolt, 4-wire system. Given this information, what is the minimum size of the copper grounding electrode conductor to a metal water pipe?
A) 6 AWG
B) 4 AWG
C) 2 AWG
D) 2/0
6 AWG
250.66(A)
NEC 110.24 (with exceptions) requires that the maximum available fault current be marked on ___
A) distribution panelboards
B) motor control centers
C) service equipment
D) transfer switches
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.
A) listed
B) low-voltage
C) manufactured
D) special-application
listed
The minimum size of the copper main bonding jumper for a service that consists of one 350 kcmil copper conductor per phase is ___
A) 2 AWG
B) 4 AWG
C) 6 AWG
D) 8 AWG
2 AWG
Table 250.102(C)(1)
The hand signal in which you have your arm extended to the side with your thumb pointed down will tell the crane operator to ___
A) drop the load
B) lower the boom
C) lower the load
D) stop everything
lower the boom
A continuous load is a load where the maximum current is expected to continue for ___ or more
A) 1 hour
B) 2 hours
C) 3 hours
D) 4 hours
3 hours
What is the minimum size AWG copper conductor permitted for conductors with a 0 through 2000 volt rating?
A) #14
B) #10
C) #8
D) #6
14
310.3(A)
Which item is a suitable grounding electrode
A) A 20’ #4 copper conductor encased in 12” of concrete footing
B) a 3/8” steel rod driven 6’ into the soil
C) A metal underground water pipe in direct contact with the earth for 6’
D) The metal frame of the building not in direct contact with earth vertically for 10’ or more.
a 20’ #4 copper conductor encased in 12” of concrete footing
The hand signal in which you have both arms extended out to the sides and flap your hands up and down will tell the crane operator to ___
A) lower the boom
B) move slowly
C) raise the load
D) stop
stop
