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Electrical Machines
Hunting phenomenon is observed in which motor?
Synchronous motor.
Both A and C.
Induction motor.
DC motor.
Synchronous motor.
Both A and C.
Induction motor.
DC motor.
Answer
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Related Question
Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will
not start at all.
get heated and damaged.
rotate in the same direction as before maintenance.
rotate in direction opposite to that before maintenance.
not start at all.
get heated and damaged.
rotate in the same direction as before maintenance.
rotate in direction opposite to that before maintenance.
Answer
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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is
3600 rpm.
500 rpm.
3000 rpm.
600 rpm.
3600 rpm.
500 rpm.
3000 rpm.
600 rpm.
Answer
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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is
16.67 Hz.
50 Hz.
60 Hz.
25 Hz.
16.67 Hz.
50 Hz.
60 Hz.
25 Hz.
Answer
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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively
less and thick
less and thin
large and thin
large and thick
less and thick
less and thin
large and thin
large and thick
Answer
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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,
polarities of all transformers must be same.
percentage impedance of all transformers must be same.
MVA rating of all transformer inversely proportional to impedance.
voltage ratio of all transformers must be same.
polarities of all transformers must be same.
percentage impedance of all transformers must be same.
MVA rating of all transformer inversely proportional to impedance.
voltage ratio of all transformers must be same.
Answer
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