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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 16KVA
 20KVA
 0KVA
 4KVA

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Electrical Machines
Induction motor operation depends on

None of these
 either of these.
 stationary magnetic field.
 rotating magnetic field.

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Electrical Machines
Select the motor that should not be started on no load?

 Brushless DC motor.
 Compound motor.
 Shunt motor.
  Series motor.

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce the eddy currents.
  prevent hunting and provide the starting torque.
  reduce noise level only.
  provide starting torque only.

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Electrical Machines
A single-winding single-phase motor has

  zero starting torque.
 starting torque equal to full-load torque.
 low starting torque.
 high starting torque.

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 any of the two machines
 machine B
 machine A
 none of these

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