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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f1.5.
 f3.
  f.
 f2.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 3 to 5.
  1.5 to 2.
 1.0.
 2 to 3.

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imin
 Vmin to Imax
 Vmax to Imax
 Vmax to Imin

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 2 + s.
  s.
  2 - s.
 1 - s.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  eddy current losses.
  hysteresis losses.
  ohmic losses.
  mechanical losses.

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Electrical Machines
The field system of an alternator is usually excited

  3 - Φ, 50 Hz and 400 V.
  250 / 250 V DC.
  110 / 220 V AC.
  230 V AC.

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