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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  none of these.
  wound.
  cage.
  linear.

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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?

 S
 1-S
 2-S
 1/S

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and load angle
 supply voltage, load angle and excitation
 supply voltage and excitation
 excitation and load angle

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T is independent of P.
 T ∝ √P.
 T2 ∝ P3.
 T ∝ P.

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Electrical Machines
Hunting phenomenon is observed in which motor?

 DC motor.
 Induction motor.
 Both A and C.
  Synchronous motor.

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Electrical Machines
The use of higher flux density in the transformer design

None of these
 reduces the weigh per KVA
 has no relation with the weight of transformer
 increases the weigh per KVA

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