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Electrical Machines

Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 21%
 41%
 10%
 11%

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Electrical Machines
Regenerative braking is possible in

 DC series motor.
  DC shunt motor with field weakening control.
 DC compound motor.
 DC shunt motor with armature resistance control.

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Electrical Machines
Flux density under leading pole tips in case of generator will

 increase
 either increase or decrease
 decrease
None of these

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Electrical Machines
Which type of motors are preferred in lifts?

 DC series motors.
None of these
 DC compound motors.
 DC shunt motors.

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

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

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  very low
  approx to one.
  less than one.
  greater than one.

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