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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.
 25 W.
 36 W.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 50Hz
 2.5Hz
 1 Hz

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 same.
 less than 50%.
 between 50% and 90%.
 more.

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
  1.
 0.8.
 0.6.

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 increases
 decreases
 remains unaffected
 any of the above

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Electrical Machines
Iron loss in a transformer mainly occurs in

 transformer insulating oil.
 winding of transformer.
 iron made tank of transformer.
 steel core in transformer.

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