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Electrical Machines

Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0.5
 0
 1
 any of the above

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  voltage.
  load.
  speed and voltage.
 speed.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 any of the above.
 greater than the primary.
 less than primary.
 equal to primary.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  magnetic inertia.
  high speed.
  high field resistance.
  residual flux.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 60, s = 0.96 %.
  P = 50, s = 4.43 %.
  P = 20, s = 3.33 %.
  P = 40, s = 5.79 %.

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 As a separate unit.
 In parallel with the armature winding.
  In series with the armature winding.

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