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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

  Low.
 Infinitely large.
 1000 ohms.
 around 500 ohms.

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

 115 V.
 200 V.
 460 V.
 230 V.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Shunt motor.
 Series motor.
 Cummulative compound motor.
 Differential compound motor.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  capacitor run IM.
  repulsion motor type starting.
  synchronous motor.
  transformer with short-circuited secondary.

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

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

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Electrical Machines
The stator frame in an induction motor is used to

  provide return path for the flux.
  ventilate the armature.
  protect the whole machine.
  hold armature stamping in position.

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MORE MCQ ON Electrical Machines

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