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Electrical Machines

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

 copper loss
 iron loss
 mechanical loss
 both A and B

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 same
 either of these
 exactly opposite
None of these

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying supply voltage.
  Both (A) and (B).
  By varying number of poles.
  By varying the supply frequency.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  rotor at slip rings.
  stator phases of the motor.
  starting resistance in the starter.
None of these

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 power factor and dc excitation at constant load
All of these
 supply voltage and field current at constant excitation
 power factor and supply voltage during hunting

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 4/3.
 9/16.
 3/4.
 16/9.

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