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Electrical Machines

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 500.
 0.
 2000.
 1000.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
All of these
 reversing the terminals of starting winding.
 interchanging the capacitor from starting winding to main winding or vice versa.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
 zero
All of these
 minimum

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Electrical Machines
Which of the following motor is used in grinders?

  Capacitor start capacitor run IM.
  Split phase IM.
  Capacitor start IM.
  Synchronous motor.

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Electrical Machines
In a synchronous motor, damper windings are provided on

  stator frame.
  pole faces.
  rotor shaft.
None of these

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

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

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