AC THEORY QUESTIONS WITH
CORRECT ANSWERS
When rra rrsteady rrdirect rrcurrent rrflows rrthrough rra rrcoil. rrThe rronly rropposition rrto rrthe
rrflow rrof rrcurrent rris rrthe rrresistance rrof rrthe rrwire rrfrom rrwhich rrthe rrcoil rris rrmade. rr-
rrAnswer rrTrue
Alternating rrcurrent rrflowing rrthrough rra rrcoil rris rropposed rrby rrtwo rrfactors, rrresistance
rr(R) rrand rrinductive rrreactance rr(XL). rr- rrAnswer rrTrue
? rris rrthe rrinduction rrof rrvoltage rror rrCEMF rrthat rropposes rrthe rrcurrent rrflow rrin rra rrcoil.
rr- rrAnswer rrInductive rrreactance
The rrtotal rrcurrent-limiting rreffect rrof rrthe rrinductor rris rra rrcombination rrof rrthe rrinductive
rrreactance rrand rrresistance rrof rrthe rrinductor. rr- rrAnswer rrTrue
The rrtotal rrcurrent-limiting rreffect rrof rran rrinductor rris rrcalled rr? rrand rris rrsymbolized rrby
rrthe rrletter rr? rr- rrAnswer rrimpedance/ rrZ
In rrmost rrAC rrcircuits, rrthe rrcurrent rrand rrvoltage rrare rr? rr. rr- rrAnswer rrout rrof rrphase
There rrcan rrbe rra rrphase rrdifference rrbetween rrvoltage rrand rrcurrent rrin rrDC rrcircuits. rr-
rrAnswer rrFalse
The rrequation rrfor rrfinding rrpower rrin rra rrcircuit rrwhen rrthe rrcurrent rrand rrvoltage rrare
rrknown rris rr? rr. rr- rrAnswer rrP rr=E rrx rrI
In rra rrpure rrresistive rrcircuit, rrthe rrtrue rrpower rr(or rrwatts) rris rrequal rrto rrthe rrproduct rrof
rrthe rr? rrand rr? rr. rr- rrAnswer rrCurrent/ rrVoltage
An rrelectrical rrmeasurement rrcalled rrVARs rris rrused rrto rrmeasure rr? rrpower. rr- rrAnswer
rrReactive
VARs rrare rrequal rrto rrthe rramount rrof rrcurrent rrflowing rrthrough rra(n) rr? rrpart rrof rra
rrcircuit rrtimes rrthe rrvoltage rrapplied rrto rrthe rr? rrpart rrof rrthe rrcircuit. rr- rrAnswer
rrInductive rr/ rrInductive
? rrpower rrin rra rrcircuit rris rrthe rrvoltage rrat rra rrcertain rrinstant rrmultiplied rrby rrthe
rrcurrent rrat rrthat rrsame rrinstant. rr- rrAnswer rrInstantaneous
CORRECT ANSWERS
When rra rrsteady rrdirect rrcurrent rrflows rrthrough rra rrcoil. rrThe rronly rropposition rrto rrthe
rrflow rrof rrcurrent rris rrthe rrresistance rrof rrthe rrwire rrfrom rrwhich rrthe rrcoil rris rrmade. rr-
rrAnswer rrTrue
Alternating rrcurrent rrflowing rrthrough rra rrcoil rris rropposed rrby rrtwo rrfactors, rrresistance
rr(R) rrand rrinductive rrreactance rr(XL). rr- rrAnswer rrTrue
? rris rrthe rrinduction rrof rrvoltage rror rrCEMF rrthat rropposes rrthe rrcurrent rrflow rrin rra rrcoil.
rr- rrAnswer rrInductive rrreactance
The rrtotal rrcurrent-limiting rreffect rrof rrthe rrinductor rris rra rrcombination rrof rrthe rrinductive
rrreactance rrand rrresistance rrof rrthe rrinductor. rr- rrAnswer rrTrue
The rrtotal rrcurrent-limiting rreffect rrof rran rrinductor rris rrcalled rr? rrand rris rrsymbolized rrby
rrthe rrletter rr? rr- rrAnswer rrimpedance/ rrZ
In rrmost rrAC rrcircuits, rrthe rrcurrent rrand rrvoltage rrare rr? rr. rr- rrAnswer rrout rrof rrphase
There rrcan rrbe rra rrphase rrdifference rrbetween rrvoltage rrand rrcurrent rrin rrDC rrcircuits. rr-
rrAnswer rrFalse
The rrequation rrfor rrfinding rrpower rrin rra rrcircuit rrwhen rrthe rrcurrent rrand rrvoltage rrare
rrknown rris rr? rr. rr- rrAnswer rrP rr=E rrx rrI
In rra rrpure rrresistive rrcircuit, rrthe rrtrue rrpower rr(or rrwatts) rris rrequal rrto rrthe rrproduct rrof
rrthe rr? rrand rr? rr. rr- rrAnswer rrCurrent/ rrVoltage
An rrelectrical rrmeasurement rrcalled rrVARs rris rrused rrto rrmeasure rr? rrpower. rr- rrAnswer
rrReactive
VARs rrare rrequal rrto rrthe rramount rrof rrcurrent rrflowing rrthrough rra(n) rr? rrpart rrof rra
rrcircuit rrtimes rrthe rrvoltage rrapplied rrto rrthe rr? rrpart rrof rrthe rrcircuit. rr- rrAnswer
rrInductive rr/ rrInductive
? rrpower rrin rra rrcircuit rris rrthe rrvoltage rrat rra rrcertain rrinstant rrmultiplied rrby rrthe
rrcurrent rrat rrthat rrsame rrinstant. rr- rrAnswer rrInstantaneous
