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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  linear.
  wound.
  none of these.
  cage.

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 Compounded DC generator.
 None of these.
 DC series generator.

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase in reliability
 continuity supply is maintained
All of these
 Increase efficiency under light load conditions

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Transistor series regulator.
None of these
  Zener diode shunt regulator.
  Transistor shunt regulator.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 2-S
 1-S
 1/S
 S

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 2 + s.
 1 - s.
  s.
  2 - s.

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