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Electrical Machines

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

 4KVA
 16KVA
 20KVA
 0KVA

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

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

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Electrical Machines
The reduced air gap results in an increase

  starting torque.
  power factor.
  cost of operation.
  breaking torque.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 50Hz
 2HZ
 2.5Hz

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Torque and field current.
 Power factor and field current.
 Armature current and torque.
  Armature current and field current.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

  zero.
  less than 1 %.
 4 %.
 1.5 %.

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