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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa.
  EIa.
  EbIa2.
  none of these.

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 stray losses.
 core losses.
 dielectric losses.
 copper losses.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

All of these
  vibrations.
  double frequency currents in the rotor.
  heating of rotor.

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Electrical Machines
The application that need frequent starting and stopping is

  blowers.
  lifts and hoists.
  paper mills.
  jaw crushers.

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Electrical Machines
The constant losses in transformer is/are

 eddy current loss.
 both 2 and 3.
 hysteresis loss.
 copper loss.

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Electrical Machines
Hysteresis loss will depends on

 f²
 f1.6
 f
 f³

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