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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 625 W
 700 W
 650 W

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  increased.
  modified.
  reversed.
  none of these.

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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.
 synchronizing power co efficient.
 damping torque.
  restoring torque.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to get more flux.
All of these
 In order to get saturated.
 In order to not to get saturated.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 Induction motor.
 DC Shunt Motor
 AC single phase motor.
 Synchronous motor.

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  commutator with large number of segments.
 graphite brushes.
  carbon brushes.
  equalizer rings.

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