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Electrical Machines

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 1000.
 500.
 0.
 2000.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  synchronous motor.
  repulsion start induction motor.
  capacitor start induction motor.
  transformer with secondary short circuited.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Synchronous motor.
  DC series motor.
  AC slip ring motor.
  Single phase induction motor.

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 equal to that of second transformer.
 none of these.
 less than that of second transformer.
  more than that of second transformer.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
All of these
 reversing the terminals of starting winding.
 interchanging the capacitor from starting winding to main winding or vice versa.

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Electrical Machines
Dummy coils are used for

 mechanical balancing.
All of these
 increasing efficiency.
 reducing armature reaction.

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