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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f1.5.
 f3.
 f2.

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Electrical Machines
Generators work on the principle of production of

 statically induced emf.
 dynamically and statically induced emf.
None of these
 dynamically induced emf.

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 45°.
  10°.
 24°.
 30°.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to provide better flux linkage.
  to reduce mechanical losses.
  to reduce hysteresis loss.
  to reduce eddy current loss.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 300 V.
 200 V.
  223.V.
 150 V.

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Electrical Machines
If input of a transformer is square wave the output will be

 sine wave.
  pulsed wave.
 triangular wave.
 square wave.

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