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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

  about 75°.
 0°.
 90°.
 about 115°.

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Electrical Machines
In double cage induction motor, the outer cage offers

  low resistance and high reactance.
  low resistance and low reactance.
  high resistance and high reactance.
  high resistance and low reactance.

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Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of crawling.
 reduce chance of cogging.
  reduce magnetizing current.
 increase starting torque.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  eddy current losses.
  ohmic losses.
  mechanical losses.
  hysteresis losses.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  slip.
  skewing.
  cogging.
  crawling.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

None of these
 load test
 OC and SC tests
 back to back test

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