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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 5%
 10%
 19%
 40%

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  repulsion motor type starting.
  transformer with short-circuited secondary.
  capacitor run IM.
  synchronous motor.

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 As a separate unit.
  In series with the armature winding.
 In parallel with the armature winding.
 In parallel with the field winding.

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

All of these
 armature mmf
 armature current
 armature flux

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Electrical Machines
Stepper motor is used in

 computer printers
 food processing
All of these
 traction

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Electrical Machines
The polarity of a DC generator can be reversed by

 reversing the field current.
 increasing field current.
 reversing field electric current as well as direction of rotation.
 any of above.

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