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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

 25 W.
 30 W.
 36 W.
 28 W.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 reduced starting current.
 smoother acceleration.
 more starting torque.
 more starting time.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases.
 increases.
 remains constant.
 decreases

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Electrical Machines
Open circuit test on transformer gives

 copper loss
 both 1and 2
 hysteresis loss
 eddy current loss

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce the eddy currents.
  prevent hunting and provide the starting torque.
  reduce noise level only.
  provide starting torque only.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 45 HZ
 48.5 Hz
 50 Hz
 48 Hz

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