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Electrical Machines

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

 Speed regulation.
 Running Torque.
 Starting torque.
  Effiency.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 hyperbola
 any of the above
 linearised
 parabola

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave controlled
 half wave
 full wave
 full wave controlled

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Electrical Machines
Field weakening method is also called as-----------?

 constant torque control
 constant power control
 constant current control
 constant voltage control

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1400W, 1000W
 800W, 1600W
 1000W , 1400W
 1600W, 800W

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Electrical Machines
Flux density under leading pole tips in case of generator will

 increase
 decrease
None of these
 either increase or decrease

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