A.pulsating magnetic flux
B.oscillating magnetic field
C.relative rotation between field and armature
D.all above
Explanation: The correct answer is relative rotation between field and armature.
Submitted by: Academy of Pakistan
D.C. Generators in Electrical Engineering MCQs: 120 practice questions with answer choices and available explanations. Page 7 of 8.
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D.C. Generators
Showing page 7 of 8 · 120 total solved questions available.
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A.slip rings
B.commutator
C.solid connection
D.none of above
Explanation: The correct answer is commutator.
Submitted by: Academy of Pakistan
A.will be zero
B.will be of 5 Hz
C.will be of v Hz 5
D.will be of 5 xiVHz
Explanation: The correct answer is will be of 5 Hz.
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A.none of the above
B.mica is harder than copper
C.mica and copper are equally hard
D.copper is harder than mica
Explanation: The correct answer is mica is harder than copper.
Submitted by: Academy of Pakistan
A.low voltage, low current
B.high voltage, high current
C.high voltage, low current
D.low voltage, high current
Explanation: The correct answer is low voltage, high current.
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A.excessive spring pressure
B.high mica insulation between com-mutation bars
C.all of the above factors
D.rough commutator bars
E.abrasion from dust
Explanation: The correct answer is all of the above factors.
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A.copper
B.carbon
C.cast iron
D.mica
Explanation: The correct answer is carbon.
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A.pulsating
B.triangular
C.sinusoidal
D.flat topped
Explanation: The correct answer is flat topped.
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A.current
B.speed
C.voltage
D.none of above
Explanation: The correct answer is speed.
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A.all of the above
B.brushes should smoothly run in the holders
C.brushes should be of proper grade and size
D.smooth, concentric commutator properly undercut
Explanation: The correct answer is all of the above.
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A.less than no load terminal voltage
B.more than no load terminal voltage
C.equal to no-load terminal voltage
D.almost zero
Explanation: The correct answer is more than no load terminal voltage.
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A.600 V
B.580 V
C.620 V
D.640 V
Explanation: The correct answer is 580 V.
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A.5 percent
B.10 percent
C.40 percent
D.25 percent
Explanation: The correct answer is 5 percent.
Submitted by: Academy of Pakistan
A.the brushes of same polarity should track each other
B.brush position has no effect on the commutator grooving
C.None
D.the brushes of opposite polarity should track each other
Explanation: The correct answer is the brushes of opposite polarity should track each other.
Submitted by: Academy of Pakistan
A.deferentially compounded long shunt
B.differentially compounded short shunt
C.cumulatively compounded long shunt
D.cumulatively compounded short shunt
Explanation: The correct answer is deferentially compounded long shunt.
Submitted by: Academy of Pakistan