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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 1
 infinite value
 finite value
 0

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  asynchronous motor.
  synchronous generator.
  asynchronous generator.
  synchronous motor.

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Electrical Machines
A compound motor has

  only series field winding.
  only shunt field winding.
  both shunt and series field winding.
  tertiary winding.

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Electrical Machines
In synchronous motor the torque is proportional to

 1/P²
 1/P
 Power P
 P²

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  efficiency.
  ratio of starting to running torque.
  ratio of starting to running current.
  ratio of input to output voltage.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 draw a starting current many times its rated full load current.
 provide execessive voltage drop in line.
 damage the armature and commutator.
 all of above.

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MORE MCQ ON Electrical Machines

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