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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 90o.
 dependent upon the load.
 0o.
 180o.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Magnetization
None of these
 Demagnetization
 Cross magnetization

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Electrical Machines
If input of a transformer is square wave the output will be

 square wave.
 triangular wave.
 sine wave.
  pulsed wave.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K
 R1 /K²
 K×R1
 K²R1

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at full load.
 copper loss at over load.
 copper loss at half load.
  copper loss at any load.

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Electrical Machines
The rotor speed of an induction motor is given by

  Nr = 120f / p × (1-s).
  Ns = 120f /p × ( 1 - r).
None of these
  Ns = 120f / p × ( 1 - s ).

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