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Electrical Machines

Electrical Machines
At slip s = 1 torque developed in machine is

  electromagnetic torque.
  maximum torque.
  none.
  starting torque.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  speed can not be increased.
  decreasing of frequency.
  increasing number of poles.
  increasing of frequency.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 238.2 V.
 271.7 V.
 240 V.
  256.4 V.

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Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  power factor.
  magnetizing current.
  speed.
  air gap flux.

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Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
 steel core.
 transformer insulating oil.
  winding conductors and steel structures of transformer.

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Electrical Machines
Lamination of transformer core is made of

 cast steel.
  cast iron.
 wrought iron.
  silicon steel.

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