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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lag
 0.2 lead
 unity
 0.9 lag

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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

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

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 remains unaffected
None of these
 decreases
 increases

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 180.
  270.
 30.
 45.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  resonance.
  crawling.
  harmonics.
  cogging.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the motor will attain dangerously high speed.
 the armature current will reduce.
 the motor will come to stop.
 the speed of motor will be reduced.

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