Kentucky Masters exam Electric Exam with
accurate detailed solutions
A 120 volt road sign has #6 copper THWN conductors in a 2" PVC conduit. The sign pulls 8
amps and is on a 30 amp breaker. what is the longest distance that the sign can be located
from the sub-panel and still be legal? Use k = 12.9
a. 100-200 feet
b. 201-300 feet
c. 301-400 feet
d 401-500 feet - correct answer✔✔d. 401-500
A 175 KVA, single phase transformer having a primary voltage of 240 and a secondary
voltage of 120 has been installed at a multi-family dwelling. The current available at the
primary is ___.
Select one:
a. 329 amps
b. 421 amps
c. 625 amps
d. 729 amps - correct answer✔✔d. 729 amps
A 240 volt, 20 amp circuit may supply ___ linear feet of electric baseboard heat. Baseboard
heaters being used are rated 240 volts, 250 watts per linear foot.
Select one:
a. 12
b. 15
,c. 16
d. 18 - correct answer✔✔b. 15
A 45 kVA 3 phase transformer has 480/277 volts on the primary and 208/120 volts on the
secondary. If the secondary side is pulling 47 amps, how many amps will the primary pull?
Select one:
a. 20
b. 54
c. 94
d. 125 - correct answer✔✔a. 20
A bare #4 conductor may be concrete encased and serve as the grounding electrode when at
least ___ feet in length.
Select one:
a. 10
b. 12
c. 20
d. 15 - correct answer✔✔c. 20
A cabinet or cutout box if constructed of sheet steel, the metal thickness shall not be less
than ___ inch uncoated.
Select one:
a. 0.053
b. 0.503
c. 0.040
d. 0.373 - correct answer✔✔a. 0.053
, A device box contains four #10 conductors and four #12 conductors. Assuming each
conductor carries current, for the purposes of determining box fill, these conductors are
equivalent to ___ cubic inches.
Select one:
a. 17
b. 18
c. 19
d. 20 - correct answer✔✔c. 19
A ground rod is required to be driven a MINIMUM of ___ feet into the soil.
Select one:
a. 4
b. 6
c. 8
d. 10 - correct answer✔✔c. 8
A lighting fixture shall be supported independently of the outlet box when it weighs more
than ___ pounds unless the outlet box is listed for the weight to be supported.
Select one:
a. 6
b. 25
c. 35
d. 50 - correct answer✔✔d. 50
A one-family dwelling unit that is at grade level shall have ___ outdoors.
Select one:
a. one receptacle at either the front or the back
accurate detailed solutions
A 120 volt road sign has #6 copper THWN conductors in a 2" PVC conduit. The sign pulls 8
amps and is on a 30 amp breaker. what is the longest distance that the sign can be located
from the sub-panel and still be legal? Use k = 12.9
a. 100-200 feet
b. 201-300 feet
c. 301-400 feet
d 401-500 feet - correct answer✔✔d. 401-500
A 175 KVA, single phase transformer having a primary voltage of 240 and a secondary
voltage of 120 has been installed at a multi-family dwelling. The current available at the
primary is ___.
Select one:
a. 329 amps
b. 421 amps
c. 625 amps
d. 729 amps - correct answer✔✔d. 729 amps
A 240 volt, 20 amp circuit may supply ___ linear feet of electric baseboard heat. Baseboard
heaters being used are rated 240 volts, 250 watts per linear foot.
Select one:
a. 12
b. 15
,c. 16
d. 18 - correct answer✔✔b. 15
A 45 kVA 3 phase transformer has 480/277 volts on the primary and 208/120 volts on the
secondary. If the secondary side is pulling 47 amps, how many amps will the primary pull?
Select one:
a. 20
b. 54
c. 94
d. 125 - correct answer✔✔a. 20
A bare #4 conductor may be concrete encased and serve as the grounding electrode when at
least ___ feet in length.
Select one:
a. 10
b. 12
c. 20
d. 15 - correct answer✔✔c. 20
A cabinet or cutout box if constructed of sheet steel, the metal thickness shall not be less
than ___ inch uncoated.
Select one:
a. 0.053
b. 0.503
c. 0.040
d. 0.373 - correct answer✔✔a. 0.053
, A device box contains four #10 conductors and four #12 conductors. Assuming each
conductor carries current, for the purposes of determining box fill, these conductors are
equivalent to ___ cubic inches.
Select one:
a. 17
b. 18
c. 19
d. 20 - correct answer✔✔c. 19
A ground rod is required to be driven a MINIMUM of ___ feet into the soil.
Select one:
a. 4
b. 6
c. 8
d. 10 - correct answer✔✔c. 8
A lighting fixture shall be supported independently of the outlet box when it weighs more
than ___ pounds unless the outlet box is listed for the weight to be supported.
Select one:
a. 6
b. 25
c. 35
d. 50 - correct answer✔✔d. 50
A one-family dwelling unit that is at grade level shall have ___ outdoors.
Select one:
a. one receptacle at either the front or the back
