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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum current.
 no voltage.
 maximum voltage.
 maximum power.

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Electrical Machines
What are the starters used for starting of cage motors?

  All of these.
 DOL starter.
 Star-delta starter.
 Auto transformer starter.

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 through inductive coupling
 either of these depending on the design of the motor
 in series
 in parallel

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Series motor.
  Shunt, compound and series motor.
  Shunt motor as well as compound motors.
  Shunt motor.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting time.
 smoother acceleration.
 reduced starting current.
 more starting torque.

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.6.
 0.4.
  1.
 0.8.

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MORE MCQ ON Electrical Machines

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