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Electrical Machines

Electrical Machines
In above question, find rms line voltage for delta connection?

 399 V.
 50 V.
  230.2 V.
 100 V.

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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.

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

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Electrical Machines
Ideal value of voltage regulation of a device is?

 a positive finite value
 0
 ∞
 a finite negative value

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 50 Hz
 40 HZ
 60 Hz
 25 Hz

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 increase.
 decrease.
 become execessively high.
 remain unaltered.

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  repulsion motor.
  shunt motor.
  asynchronous motor.
  transformer.

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