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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 460 V.
 200 V.
 230 V.
 115 V.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying the supply frequency.
  Both (A) and (B).
  By varying number of poles.
  By varying supply voltage.

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

  Shunt.
 Series.
 Differential compound.
 Cummulative compound.

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 stray losses.
 core losses.
 dielectric losses.
 copper losses.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  AC slip ring motor.
  DC series motor.
  Synchronous motor.
  Single phase induction motor.

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Slip.
 Rotor current.
 Line voltage.
 Running torque.

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MORE MCQ ON Electrical Machines

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