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Electrical Machines

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 90o.
 less than 90o.
 Greater than 90o.
 0o.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0
 0.5
 1
 any of the above

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

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

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Separately excited.
 Shunt.
  Compound.
  Series.

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Electrical Machines
Which type of motors uses slip rings?

 Synchronous motors
 DC Shunt Motor
 Both Synchronous and Induction motor
 Induction motors

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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

  1.
 0.8.
 0.6.
 0.4.

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