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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  maximum.
  constant.
  minimum.

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Electrical Machines
Which of the following machine will have maximum efficiency?

  Electrical power transformer.
 DC motor.
 Induction motor.
 Electrical power generator.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 123.3 KVA
 100 KVA
 83.33 KVA
 50 KVA

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce mechanical losses.
  to reduce eddy current loss.
  to reduce hysteresis loss.
  to provide better flux linkage.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 remain nearly constant
 increase to rated voltage and then may decrease
 increase gradually and then stay at rated voltage
 decrease

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 synchronizing power co efficient.
  restoring torque.
 mechanical rotatory system.
 damping torque.

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