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Electrical Machines

Electrical Machines
Slip exists in

  none of above.
  induction motor.
  synchronous motor.
  in both machines.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  It will rotates in normal operation.
  Fail to start.
  Either short circuit or open circuit occurs.
  It will rotates in reverse direction.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

  no magnetic core loss.
 less magnetic core loss.
  more copper loss.
 more magnetic core loss.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 200 V.
 800 V.
 100 V.
 400 V.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant supply voltage V, starting torque Tst decreases
None of these
 constant V, Tst increases
 either of these

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 differentially compounded motor
 comulatively compounded motor
 permanent magnet motor
 series motor

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