Master Electrician's Exam Prep Guide Final Exam #1 CORRECT 100%
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Course
Master electrician license
Institution
Master Electrician License
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 servi...
Master Electrician's Exam Prep Guide Final Exam #1
CORRECT 100%
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.
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.
A. 20
B. 30
C. 35
D. 24 - ANSWER B. 30
pg. 229
,What MIN. voltage is require after 1.5 hours to serve emergency lighting from a storage battery when
the normal source voltage of 120 volts is interrupted?
A. 60 volts
B. 90 volts
C. 105 volts
D. 120 volts - ANSWER C. 105 volts
pg. 609
Determine the MAX. ampere setting permitted for an overload protective device responsive to motor
current, where used to protect a 20 hp, 240-volt, 3 phase, induction type ac motor with a temperature
rise of 48 deg. C and a FLA of 54 amperes indicated on the nameplate.
A. 54 amperes
B. 70.2 amperes
C. 62.1 amperes
D. 75.6 amperes - ANSWER B. 70.2 amperes
pg. 309, 316
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.
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
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