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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 70° to 85°
 25° to 30°
 0°
 90°

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 non uniform cylindrical.
  salient.
 none of these.
 cylindrical.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  remains constant.
 increases.
  decreases.
  increases upto a limit and then remains almost constant.

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

 Remain unchanged.
  Increase by 5%.
 Depends on other factor.
 Reduce by 5%.

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

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at half load.
 copper loss at full load.
 copper loss at over load.
  copper loss at any load.

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