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Electrical Machines

Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 any of the above
 0
 0.5
 1

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Electrical Machines
Which of the following rotor requires damper winding?

 Cylindrical rotor.
 Salient pole rotor.
 Both type rotor.
None of these

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 2-S
 S
 1/S
 1-S

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 copper loss
 both A and B
 iron loss
 mechanical loss

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K×R1
 K²R1
 R1 /K²
 R1 /K

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Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  EbIa.
  none of these.
  EIa.

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