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Electrical Machines
Transformer oil is used as
a coolant.
inert medium.
an insulator.
both A and B.
a coolant.
inert medium.
an insulator.
both A and B.
Answer
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Related Question
Electrical Machines
The armature of DC motor is laminated
to reduce the mass.
to reduce the hysteresis loss.
to reduce the inductor.
to reduce the eddy current loss.
to reduce the mass.
to reduce the hysteresis loss.
to reduce the inductor.
to reduce the eddy current loss.
Answer
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Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor
Increase in speed demanding more armature current.
Decrease in speed but armature current remains the same.
Increase in speed but armature currnet remains the same.
Decrease in speed demanding less armature current.
Increase in speed demanding more armature current.
Decrease in speed but armature current remains the same.
Increase in speed but armature currnet remains the same.
Decrease in speed demanding less armature current.
Answer
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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?
Full load current.
Starting torque.
Operating speed.
Starting torque, operating speed, full load current.
Full load current.
Starting torque.
Operating speed.
Starting torque, operating speed, full load current.
Answer
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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by
Kef2Kf2Bm.
Kef2Kf2Bm2.
KefKf2Bm2.
Kef2KfBm2.
Kef2Kf2Bm.
Kef2Kf2Bm2.
KefKf2Bm2.
Kef2KfBm2.
Answer
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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where
low starting torque.
power factor is less.
less costly motor is not required.
high starting torque.
low starting torque.
power factor is less.
less costly motor is not required.
high starting torque.
Answer
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