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Electrical Machines

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

 mechanical loss
 both A and B
 iron loss
 copper loss

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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

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

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  run normally.
  not run.
  make noise.
  get over heated.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 trapezoidal.
  triangular.
 rectangular.
 sinusoidal.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Operating speed.
  Full load current.
 Starting torque.
 Starting torque, operating speed, full load current.

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

  wound.
  cage.
  none of these.
  linear.

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