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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the load.
 varying the speed.
 varying the applied voltage.
 changing the field excitation.

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 1 : 1.
 N12 : N22.
 none.
 N1 : N2.

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Electrical Machines
Which of the following motor used in hair dryers?

  Cage induction motor.
  Split phase IM.
  Shaded pole IM.
  Synchronous motors.

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Electrical Machines
Alternator operates on the principle of

  self induction.
  mutual induction.
  self or mutual induction.
  electromagnetic induction.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing number of poles.
  decreasing of frequency.
  speed can not be increased.
  increasing of frequency.

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MORE MCQ ON Electrical Machines

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