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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 200 V
 115 V
 460 V

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Electrical Machines
In electric locomotive which of the following motor are used ?

  Shunt motor.
  DC series motor.
  Synchronous motor.
  Separately compound motor.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the inductor.
 to reduce the mass.
 to reduce the eddy current loss.
 to reduce the hysteresis loss.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 all of above.
 poor overall efficiency.
 high maintenance cost.
 high initial cost.

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 10 Ω.
  4 Ω.
 8 Ω.
  2 Ω.

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 1 alone
 1 and 3
 2 and 3
 1 and 2

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