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Electrical Machines

Electrical Machines
The flux involved in the emf equation of a transformer has

 rms value.
 average value.
  maximum value.
 total value.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  either field terminals are reversed or armature terminals are reversed.
  only field terminals are changed.
  none of above.
  only armature terminals are reversed.

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

None of these
 pure capacitive load
 pure resistive load
 pure inductive load

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
  2 Hz.
 10 Hz.
  3 Hz.

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 open fuse or circuit breaker.
 produce sparking at brushes.
 develop excessive speed and damage itself.
 draw too much current.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

  600 rpm.
 3000 rpm.
 500 rpm.
 3600 rpm.

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