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Electrical Machines

Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 less than 90°
 Greater than 90°
 0°
 90°

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Electrical Machines
The three point starter is used for

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

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 reactance voltage produced due to communication.
 the use of compensating winding.
  the use equalizer in lap winding.
 the use drum winding.

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

 1.5 %.
  2.67 %.
 5 %.
  30 %.

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Electrical Machines
Series booster is a

 separately excited DC generator.
 shunt wound DC generator.
 permanent magnet DC generator.
  series wound DC generator.

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

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

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MORE MCQ ON Electrical Machines

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