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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f3.
  f.
 f2.
 f1.5.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 more magnetic core loss.
  no magnetic core loss.
 less magnetic core loss.
  more copper loss.

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

None of these
  either stator winding or rotor winding.
  rotor winding.
  stator winding.

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

 45.
  270.
 30.
 180.

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 reduced to half
 remain unaltered
 increase by 200%
 increase by 100%

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 develop very low starting torque.
 not start automatically.
 get damaged.
 start automatically without trouble.

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