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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 decrease.
 not change.
 increase.
 None of above.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Cumulative compound motor.
  Series motor.
  Shunt motor.
  Differential compound motor.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.05.
  1.0.
  0.5.

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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 and 2
 1 alone
 2 and 3
 1 and 3

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
  0.573.
 0.443.
 0.649.

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MORE MCQ ON Electrical Machines

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