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Electrical Machines

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

  wound.
  none of these.
  cage.
  linear.

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Electrical Machines
Cross magnetization effects which of the following?

 reduction in main field flux
 reduces the terminal voltage
 both 2 and 3
 commutation

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor start
 Resistance split phase
 Capacitor run
 Shaded pole

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Multiple voltage control.
 Field control.
 Ward-Leonard control.
 Armature control.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

  Bush bearings.
  Ball bearings.
None of these
  Cast iron bearings.

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