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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
 0.3.
  1.
 0.7.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Ward Leonard control.
  Rheostatic control.
  None of above.
  Any of above method.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 increases hysteresis loss.
All of these
 makes the material brittle.
 Increases cost.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 AC synchronous motor.
  series motor.
 cummulative compound motor.
 shunt motor.

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Electrical Machines
In case of IM the torque is

  directly proportional to slip2.
  directly proportional to slip.
  inversely proportional to √slip.
  inversely proportional to slip.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

 Shaded pole type.
 Split phase type.
  Capacitor run type.
 Capacitor start.

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