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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 remains same.
None of these
 decreases.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

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

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Electrical Machines
In double cage induction motor, the inner cage offers

  low resistance and low reactance.
  high resistance and low reactance.
  low resistance and high reactance.
  high resistance and high reactance.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetization as well as demagnetization.
 demagnetisation.
  cross-magnetisation.
  none of above.

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 increases
 decreases
 any of the above
 remains unaffected

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 double.
 4 times.
 one fourth.
 half.

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MORE MCQ ON Electrical Machines

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