ac theory 3 test QUESTIONS
AND VERIFIED CORRECT
ANSWERS GRADED A+
[LATEST] 100% GUARANTEED
PASS
In a purely resistive circuit, 100% of the apparent power is used or consumed - CORRECT
ANSWER-true
The power factor of a purely resistive circuit is ? .
Select one:
a.0%
b.100% - CORRECT ANSWER-b.100%
The addition of resistance to a reactive series circuit always ? the phase angle and ? the power
factor of the circuit.
Select one:
a.decreases / decreases
b.decreases / increases
c.increases / decreases
d.increases / increases - CORRECT ANSWER-b.
decreases / increases
, Circuits that contain both resistance and reactance must have a power factor somewhere
between ? and ? and a phase angle between ? and ? .
Select one:
a.0% / 90%, 0° / ±100°
b.0% / 100%, 0° / ±90° - CORRECT ANSWER-b.0% / 100%, 0° / ±90°
Calculate the volt-amperes for a 208-volt, 3-phase circuit that has line current of 15 amperes.
(Round the FINAL answer to the nearest whole number. - CORRECT ANSWER-VA=E*I*1.73
=208*15*1.73
=5398 VA
If a 208-volt, 3-phase circuit that has line current of 15 amperes has a power factor of 80%, how
much true power is dissipated by the circuit? (Round the FINAL answer to the nearest whole
number.) - CORRECT ANSWER-W=VA*PF
=5398*0.8
=4318
When capacitors are not switched from the line when the devices they correct are turned off,
they should have their own disconnects
Select one:
True
False - CORRECT ANSWER-True
Note: This is an NEC requirement, and if the capacitors remain on the line they could cause a
leading power factor, which may disturb the power company's equipment and that of other
users. In any case, a leading power factor can be as bad as a lagging one.
AND VERIFIED CORRECT
ANSWERS GRADED A+
[LATEST] 100% GUARANTEED
PASS
In a purely resistive circuit, 100% of the apparent power is used or consumed - CORRECT
ANSWER-true
The power factor of a purely resistive circuit is ? .
Select one:
a.0%
b.100% - CORRECT ANSWER-b.100%
The addition of resistance to a reactive series circuit always ? the phase angle and ? the power
factor of the circuit.
Select one:
a.decreases / decreases
b.decreases / increases
c.increases / decreases
d.increases / increases - CORRECT ANSWER-b.
decreases / increases
, Circuits that contain both resistance and reactance must have a power factor somewhere
between ? and ? and a phase angle between ? and ? .
Select one:
a.0% / 90%, 0° / ±100°
b.0% / 100%, 0° / ±90° - CORRECT ANSWER-b.0% / 100%, 0° / ±90°
Calculate the volt-amperes for a 208-volt, 3-phase circuit that has line current of 15 amperes.
(Round the FINAL answer to the nearest whole number. - CORRECT ANSWER-VA=E*I*1.73
=208*15*1.73
=5398 VA
If a 208-volt, 3-phase circuit that has line current of 15 amperes has a power factor of 80%, how
much true power is dissipated by the circuit? (Round the FINAL answer to the nearest whole
number.) - CORRECT ANSWER-W=VA*PF
=5398*0.8
=4318
When capacitors are not switched from the line when the devices they correct are turned off,
they should have their own disconnects
Select one:
True
False - CORRECT ANSWER-True
Note: This is an NEC requirement, and if the capacitors remain on the line they could cause a
leading power factor, which may disturb the power company's equipment and that of other
users. In any case, a leading power factor can be as bad as a lagging one.
