Download Master Electrician's Exam Prep Guide: Final Exam #1 - 100 Questions and Answers and more Exams Electrical and Electronics Engineering in PDF only on Docsity!
Final Exam #1 all 100 questions correct
and complete.
Master Electrician's Exam Prep Guide
Final Exam #1 all 100 questions correct
and complete.
Given: after all demand factors have been taken into consideration for an office building, the demand load is determined to be 90,000 VA; the building has a 120/240-volt, single phase electrical system. What MIN. size copper conductors with THHN/THWN insulation are required for the ungrounded service-lateral conductors? Consider all termination lugs are rated for 75 deg. C.
A. 400 kcmil
B. 350 kcmil
C. 300 kcmil
D. 500 kcmil - ANSWER D. 500 kcmil
pg. 142, 153, 161
Given: a commercial building is to be supplied from a transformer having a 480Y/277-volt, 3 phase primary and a 208Y/120-volt, 3 phase secondary. The secondary will have a balanced computed demand load of 416 amperes per phase. The transformer is required to have a MIN kVA rating of ____.
A. 100 kVA
B. 150 kVA
C. 86 kVA
D. 200 kVA - ANSWER B. 150 kVA
Manhole covers shall be OVER ____ or otherwise designed to require the use of tools to open.
A. 25 lbs.
Final Exam #1 all 100 questions correct
and complete.
B. 50 lbs.
C. 75 lbs.
D. 100 lbs - ANSWER D. 100 lbs
pg. 57
The branch circuit conductors supplying one or more units of information technology equipment shall have an ampacity of NOT less than ____ of the connected load.
A. 80%
B. 100%
C. 115%
D. 125% - ANSWER D. 125%
pg. 547
In regard to a 7.5 hp, 480-volt, 3 phase ac motor with an 80% power factor and a full-load ampere rating of 19 amperes indicated on the nameplate, and a service factor of 1.15; when the initial setting of the overload device you have selected is not sufficient to carry the load, what is the MAX. setting permitted for the overload protection?
A. 21.85 amperes
B. 23.75 amperes
C. 24.7 amperes
D. 26.6 amperes - ANSWER D. 26.6 amperes
pg. 309, 316
The ampacity adjustment factors for conductors addressed in Section 310.15(C)(1) of the NEC are not required to be applied when the conductors are installed in a metal wireway unless, the number of current-carrying conductors within the wireway exceeds at least ____ at any cross-section area of the wireway.
Final Exam #1 all 100 questions correct
and complete.
Where Type SRD multiconductor cable consist of size 8 AWG conductors and only 2 conductors in the cable are current-carrying, what is the ampacity of the conductors?
A. 20 amperes
B. 30 amperes
C. 40 amperes
D. 50 amperes - ANSWER C. 40 amperes
pg. 251
Aluminum or steel cable trays shall be permitted to be used as equipment grounding conductors, provided ____.
I. the cable tray sections and fittings are identified as an equipment grounding conductor.
II. the cable tray sections and fittings are durably marked to show the cross-sectional area of the metal.
A. I only
B. II only
C. neither I nor II
D. both I and II - ANSWER D. both I and II
pg. 242
When intermediate metal conduit is threaded in the field, a standard cutting die with a ____ taper per ft. shall be used.
A. 3/8 in.
B. 1/2 in.
C. 3/4 in.
D. 1 in. - ANSWER C. 3/4 in.
Final Exam #1 all 100 questions correct
and complete.
pg. 200
In regard to emergency systems, where internal combustion engines are used as the prime movers, they shall NOT be solely dependent on a public utility gas system for their fuel supply, unless ____.
A. it is acceptable to the authority having jurisdiction
B. the gas system is listed and approved
C. the gas system and electrical utility are jointly owned and maintained
D. none of these apply - ANSWER A. it is acceptable to the authority having jurisdiction
pg. 609
When a motor controller enclosure is installed outdoors and is subject to be exposed to sleet, it shall have a MIN. rating of ____, where the controller mechanism is required to be operable when ice covered.
A Type 3
B. Type 3S
C. Type 3R
D. Type 3SX - ANSWER B. Type 3S
pg. 53
Each operating room of a health care facility shall be provided with a MIN. of ____ "hospital grade" receptacles.
A. 12
B. 24
C. 36
Final Exam #1 all 100 questions correct
and complete.
D. dull-load amperage as indicated on the nameplate - ANSWER C. locked-rotor current
pg. 601
Under which, if any, of the following conditions is the neutral conductor to be counted as a current carrying conductor?
I. when it is only carrying the unbalances current from other conductors of the same current.
II. when it is the neutral conductor of a 3 phase, wye connected system that consist of nonlinear loads.
A. I only
B. II only
C. neither I nor II
D. both I and II - ANSWER B. II only
pg. 160
In general, all mechanical elements used to terminate a grounding electrode conductor or bonding jumper to a grounding electrode shall be accessible. Which of the following, if any, is/are exception(s) to this rule?
I. a connection to a concrete encased electrode
II. a compression connection to fire-proofed structural metal
A. I only
B. II only
C. neither I nor II
D. both I and II - ANSWER D. both I and II
pg. 124
Final Exam #1 all 100 questions correct
and complete.
For other than listed low-voltage luminaires not requiring grounding, all electrical equipment within a fountain or within ____ of the inside wall of a fountain shall be grounded.
A. 5 ft.
B. 6 ft.
C. 8 ft.
D. 10 ft. - ANSWER A. 5 ft.
pg. 577
Fuses shall NOT be permitted to be connected in parallel where ____.
I. they are factory assembled and listed as a unit
II. they are installed by a technician on the jobsite
A. I only
B. II only
C. neither I nor II
D. both I and II - ANSWER B. II only
pg. 100
Each multiwire branch circuit shall be provided with a means that will ____ at the point where the branch circuit originates.
A. simultaneously disconnect all ungrounded conductors
B. not simultaneously disconnect all ungrounded conductors
C. simultaneously disconnect all grounded and ungrounded conductors
D. simultaneously disconnect all grounded, ungrounded and grounding conductors - ANSWER A. simultaneously disconnect all ungrounded conductors
Final Exam #1 all 100 questions correct
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D. 150 amperes - ANSWER A. 100 amperes
pg. 79
In the critical care (Category 1) spaces of a health care facility, each patient bed location shall be provided with a MIN. of ____ "hospital grade" receptacles.
A. fourteen
B. twelve
C. ten
D. eight - ANSWER A. fourteen
pg. 439
Nonmetallic surface extensions shall be permitted to be run in any direction from an existing outlet, but NOT within ____ of the floor level.
A. 1 ft.
B. 1.5 ft.
C. 2 ft.
D. 2 in. - ANSWER D. 2 in.
pg. 232
The NEC permits a building to have more than one service when:
I. the load requirements f the building are at least in excess of 800 amperes
II. the building is separated by firewalls with a four hour rating
A. I only
B. II only
Final Exam #1 all 100 questions correct
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C. either 1 or II
D. neither I nor II - ANSWER D. neither I nor II
pg. 88
In the garage of a dwelling unit, a 125 volt, single phase, 15 ampere receptacle installed in the ceiling provided for the garage door opener must be ____.
I. a single receptacle
II. GFCI protected for personnel
A. I only
B. II only
C. either I or II
D. neither I nor II - ANSWER B. II only
pg. 62
Underground installed service conductors that are not encased in concrete and buried 18 in. or more below grade level, shall have their location identified by a warning ribbon placed at LEAST ____ above the underground installation.
A. 6 in.
B. 8 in.
C. 12 in.
D. 18 in. - ANSWER C. 12 in.
pg. 142
Outlets supplying permanently installed swimming pool pump motors from single phase, 15- or 20- ampere, 120- or 240-volt branch circuits, shall be provided with Class A GFCI protection ____.
Final Exam #1 all 100 questions correct
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B. 26.25 kW
C. 18.38 kW
D. 17.06 kW - ANSWER A. 19 kW
pg. 77, 79
When two ground rods are used to form the entire grounding electrode system of a building, the grounding conductor that bonds the two rods together shall NOT be required to be larger than size ____ copper, regardless of the size of the service-entrance conductors.
A. 8 AWG
B. 6 AWG
C. 4 AWG
D. 2 AWG - ANSWER B. 6 AWG
pg. 124
A kitchen with a total demand load of 54,000 VA is to be added to an existing church. The electrical system is 208Y/120 volts, 3 phase. What MIN. size THWN copper feeder conductors are required for the kitchen addition?
A. 1 AWG
B. 1/0 AWG
C. 2/0 AWG
D. 3/0 AWG - ANSWER B. 1/0 AWG
pg. 161
a feeder at a school welding shop is to supply the following listed transformer are welders all with a 50% duty cycle.
- two with 60 amperes rated primary current
Final Exam #1 all 100 questions correct
and complete.
The feeder is required to have an ampacity of at LEAST ____.
A. 213 amperes
B. 196 amperes
C. 182 amperes
D. 176 amperes - ANSWER D. 176 amperes
pg. 540
Where a 125-volt, single phase, 20 ampere rated receptacle outlet is installed in a residential laundry room and designated for the clothes washing machine, the receptacle outlet must be provided with ____.
A. AFCI protection only
B. GFCI protection only
C. both LCDI and GFCI protection
D. both AFCI and GFCI protection - ANSWER D. both AFCI and GFCI protection
pg. 62, 64
What is the MAX. balanced demand load, in VA, permitted to be connected to a new service of commercial building where given the following conditions?
I. the service is 208Y/120 volts, 3 phase, with a 600 ampere rated main
II. the maximum load must not exceed 80 percent of the ampere rating of the main circuit breaker
A. 57,600 VA
B. 99,840 VA
C. 172,923 VA
Final Exam #1 all 100 questions correct
and complete.
B. do not change in regard to wiring methods used
C. shall be increased for direct burial cables
D. can be increased, decreased or remain the same, depending on the wiring method used - ANSWER B. do not change in regard to wiring methods used
pg. 143
For capacitors over 1,000 volts, a means shall be provided to reduce the residual voltage to ____ after the capacitor is disconnected from the source of power.
A. 50 volts or less within 1 minute
B. 50 volts or less within 5 minutes
C. 24 volts or less within 5 minutes
D. 12 volts or less within 1 minute - ANSWER B. 50 volts or less within 5 minutes
pg. 351
Where used outside of a building, aluminum or copper-clad aluminum grounding electrode conductors shall not be terminated WITHIN ____ of the earth.
A. 18 in.
B. 24 in.
C. 3 ft.
D. 6 ft. - ANSWER A. 18 in.
pg. 122
Where installed for a commercial occupancy, determine the MIN. size THWN copper conductors required from the terminals of a 3 phase, 277/480 volt, 4 wire, 200 kW generator to the first distribution device(s) containing overcurrent protection. Assume the design and operation of the generator does NOT prevent overloading.
Final Exam #1 all 100 questions correct
and complete.
A. 250 kcmil
B. 300 kcmil
C. 400 kcmil
D. 500 kcmil - ANSWER B. 300 kcmil
pg. 341, 161
Enclosures containing circuit breakers, switches and motor controllers located in Class II, Division 2 locations, shall be ____ or otherwise identified for the location.
A. gaslight
B. vapor-proof
C. dusttight
D. stainless steel - ANSWER C. dusttight
pg. 380
Information technology equipment is permitted to be connected to a branch circuit by flexible cord-and- attachment plug cap, if the cord does NOT exceed ____ in length.
A. 6 ft.
B. 8 ft.
C. 10 ft.
D. 15 ft. - ANSWER D. 15 ft.
pg. 547
here required, conduit seals installed in Class I, Division 1 & 2 locations shall have the min. thickness of the sealing compound not less than the trade size of the sealing fitting and , in no case less than ____.
Final Exam #1 all 100 questions correct
and complete.
Portable structures for fairs, carnivals and similar events shall not be located under and no closer than ____ horizontally of conductors operating in excess of 600 volts.
A. 22.5 ft.
B. 15 ft.
C. 10 ft.
D. 12 ft. - ANSWER B. 15 ft.
pg. 463
Flexible cord and cables shall be permitted to be attached to building surfaces ____.
A. under no circumstances
B. where concealed
C. where used as a substitute for the fixed wiring of a structure
D. where the length of the cord or cable from a busway plug-in device to a suitable tension "take-up" support device does not exceed 6 ft. - ANSWER D. where the length of the cord or cable from a busway plug-in device to a suitable tension "take-up" support device does not exceed 6 ft.
pg. 259, 225
In regard to outside branch circuits of overhead spans of open individual conductors for 1000 volts or less up to 50 feet in length, the NEC mandates the conductors to be NOT less than ____ copper in size.
A. 12 AWG
B. 10 AWG
C. 8 AWG
D. 6 AWG - ANSWER B. 10 AWG
pg. 82
Final Exam #1 all 100 questions correct
and complete.
The ampacity rating requirements for a disconnecting means of x-ray equipment shall be based on at LEAST ____ of the input required for the momentary rating of the equipment, if greater than the long- term rating.
A. 125%
B. 115%
C. 80%
D. 50% - ANSWER D. 50%
pg. 450
As a general rule, the MIN. spacing required between live bare metal parts in feeder circuits of 480-volt industrial control panels and bare metal parts of the enclosure is ____.
A. 1/2 in.
B. 3/4 in.
C. 1 in.
D. 1 1/4 in. - ANSWER C. 1 in.
pg. 325
AFCI protection is required for all 15- and 20-ampere, 120 volt branch circuits supplying outlets located in ____.
A. boat houses
B. recreational vehicles
C. all guest rooms and guest suites of hotels
D. residential garages - ANSWER C. all guest rooms and guest suites of hotels
