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Electrical Machines

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

  linear.
  cage.
  none of these.
  wound.

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Rotor winding.
  Rotor mmf wave.
  Stator winding.
  Both rotor and stator winding.

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Electrical Machines
Diverters are used only in

 series motors
 either of these
 shunt motors
None of these

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide protection against Low-Voltage.
 all of above.
 limit the starting current to a safer value.
 provide overload protection.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  s2.
  sf / 2.
  sf.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a dc machine.
 rotor of a dc machine.
 stator of a induction machine.
 rotor of an synchronous machine.

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