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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 same.
 less than 50%.
 more.
 between 50% and 90%.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Oscillates around the rated speed.
  Decreases.
 Increases.
 Remains unchanged.

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Electrical Machines
The application that need frequent starting and stopping is

  lifts and hoists.
  jaw crushers.
  paper mills.
  blowers.

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Electrical Machines
DC series motor is best suited for electric traction as

 It is cheaper in cost.
 It runs at very high speed at light load.
  It develops high starting torque.
 It consume less power.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 high maintenance cost.
 poor overall efficiency.
 high initial cost.
 all of above.

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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.
 damping torque.
  restoring torque.
 mechanical rotatory system.

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