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Electrical Machines

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

 increases.
 decreases.
 remains constant.
 decreases

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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?

 50 Hz
 45 HZ
 48 Hz
 48.5 Hz

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Electrical Machines
In DC generator, lap winding is used in

 where constant speed is required.
 where greater load is connected.
 high voltage and low current applications.
  high current and low voltage applications.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Starting torque.
 Running Torque.
 Speed regulation.
  Effiency.

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Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 Partial motor.
 DC shunt motor.
 Universal motor.

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Electrical Machines
Slip exists in

  synchronous motor.
  in both machines.
  induction motor.
  none of above.

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