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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 30 W.
 28 W.
 36 W.
 25 W.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Universal motors.
  Reluctance motors.
  Induction motors.
  Stepper motors.

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 both Eb and Td are zero
 both Eb and Td are unchanged
 Eb is zero, but Td is unchanged
 Eb is unchanged, but Td is zero

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 168.75 W
 75 W
 112.5 W
 50 W

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 magnetic saturation in half of the field pole
 non-sinusoidal nature of armature mmf
 component of armature mmf along field axis

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  600 rpm.
  500 rpm.
  3000 rpm.
  3600 rpm.

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