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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 constant loss
 variable loss
 both A and B
None of these

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Cumulative compound motor.
  Series motor.
  Differential compound motor.
  Shunt motor.

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Electrical Machines
If the excitation is increased, the power factor is

 leading power factor
None of these
 lagging power factor
 unity power factor

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Electrical Machines
In DC generators brushes are used for

 reduce eddy current loss
 collecting of current without any sparkings
 convert ac armature current in to dc
 collecting of voltage

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
 double the supply voltage.
All of these
 half of the supply voltage.

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Electrical Machines
Skewing of cage rotors offers the following advantages

  less noise.
  uniform torque.
  all of below.
  locking tendency is reduced.

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