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Master Electrician's Exam Prep Guide Final Exam #1 and Answers.
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Master Electrician's Exam Prep Guide Final Exam #1 and Answers.Master Electrician's Exam Prep Guide Final Exam #1 and Answers.
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Master Electrician's Exam Prep Guide Final Exam #1and Answers.
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 kami
B. 350 kami
C. 300 kami
D. 500 kami - ANS D. 500 kami
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 - ANS 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 - ANS 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% - ANS 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 - ANS 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 - ANS 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 - ANS 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 - ANS 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 - ANS 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 - ANS 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. - ANS 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 - ANS 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 - ANS B. Type 3S
pg. 53
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