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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become
4 times.
double.
one fourth.
half.
4 times.
double.
one fourth.
half.
Answer
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Related Question
Electrical Machines
Compensating winding are used to rectify the flux density waveform at
interpole region.
throughout the air gap.
None of these
region under main pole.
interpole region.
throughout the air gap.
None of these
region under main pole.
Answer
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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.
directly.
inversely.
has no relation.
none of these.
directly.
inversely.
has no relation.
none of these.
Answer
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Electrical Machines
Air core transformer as compared to iron core transformer, has
no magnetic core loss.
more copper loss.
less magnetic core loss.
more magnetic core loss.
no magnetic core loss.
more copper loss.
less magnetic core loss.
more magnetic core loss.
Answer
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Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because
field winding was wrongly connected
there was a break in the armature circuit
there was no residual magnetism in the field circuit
field resistance was higher than critical resistance
field winding was wrongly connected
there was a break in the armature circuit
there was no residual magnetism in the field circuit
field resistance was higher than critical resistance
Answer
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Electrical Machines
What does happen if tripled harmonics given to induction motor?
Fail to start.
Nothing will happen.
Will results in short circuit.
Will results in open circuit.
Fail to start.
Nothing will happen.
Will results in short circuit.
Will results in open circuit.
Answer
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