Master Electrician's Exam Prep Guide Final Exam 1 –
Questions With Solutions
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Terms in this set (100)
Given: after all demand factors have D. 500 kcmil
been taken into consideration for an pg. 142, 153, 161
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
,Given: a commercial building is to be B. 150 kVA
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
Manhole covers shall be OVER ____ or D. 100 lbs
otherwise designed to require the use pg. 57
of tools to open.
A. 25 lbs.
B. 50 lbs.
C. 75 lbs.
D. 100 lbs
The branch circuit conductors D. 125%
supplying one or more units of pg. 547
information technology equipment
shall have an ampacity of NOT less
than ____ of the connected load.
A. 80%
B. 100%
C. 115%
D. 125%
,In regard to a 7.5 hp, 480-volt, 3 phase D. 26.6 amperes
ac motor with an 80% power factor pg. 309, 316
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
The ampacity adjustment factors for B. 30
conductors addressed in Section pg. 229
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
, What MIN. voltage is require after 1.5 C. 105 volts
hours to serve emergency lighting pg. 609
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
Determine the MAX. ampere setting B. 70.2 amperes
permitted for an overload protective pg. 309, 316
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
Where Type SRD multiconductor cable C. 40 amperes
consist of size 8 AWG conductors and pg. 251
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
Questions With Solutions
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Match Blocks Charms NEW
Terms in this set (100)
Given: after all demand factors have D. 500 kcmil
been taken into consideration for an pg. 142, 153, 161
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
,Given: a commercial building is to be B. 150 kVA
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
Manhole covers shall be OVER ____ or D. 100 lbs
otherwise designed to require the use pg. 57
of tools to open.
A. 25 lbs.
B. 50 lbs.
C. 75 lbs.
D. 100 lbs
The branch circuit conductors D. 125%
supplying one or more units of pg. 547
information technology equipment
shall have an ampacity of NOT less
than ____ of the connected load.
A. 80%
B. 100%
C. 115%
D. 125%
,In regard to a 7.5 hp, 480-volt, 3 phase D. 26.6 amperes
ac motor with an 80% power factor pg. 309, 316
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
The ampacity adjustment factors for B. 30
conductors addressed in Section pg. 229
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
, What MIN. voltage is require after 1.5 C. 105 volts
hours to serve emergency lighting pg. 609
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
Determine the MAX. ampere setting B. 70.2 amperes
permitted for an overload protective pg. 309, 316
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
Where Type SRD multiconductor cable C. 40 amperes
consist of size 8 AWG conductors and pg. 251
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
