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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 1.644 KW.
  2.73 KW.
 5.46 KW.
 0.9103 KW.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.2
 0.4
 0.02
 0.04

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will become slow.
 armature will oscillate about original speed as the mean speed
 motor will attain dangerously high speed
 armature current will drop

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Electrical Machines
If the excitation is increased, the power factor is

 lagging power factor
 leading power factor
 unity power factor
None of these

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Electrical Machines
In escalator which motor is used?

  DC shunt motor.
  1 - φ IM.
  Universal motor.
  3 - φ IM.

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 A capacitor.
 A resistor.
 an inductor.
  None of these.

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