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Electrical Machines

Electrical Machines
At slip s = 1 torque developed in machine is

  starting torque.
  electromagnetic torque.
  maximum torque.
  none.

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Electrical Machines
The starting resistance of DC motor is generally

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

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Electrical Machines
An IM cannot run at synchronous speed because

  none of above.
  air friction will prevent it.
  induction motor will become synchronous motor.
  rotor torque will not be produced.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 leading
 unity
 zero
 lagging

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Electrical Machines
In DC generator, lap winding is used in

 where greater load is connected.
 where constant speed is required.
  high current and low voltage applications.
 high voltage and low current applications.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 8
 2
 4
 1

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