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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
 about 115°.
  about 75°.
 0°.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 increased by 10%
 increased by 20%
 reduced by 10%
 reduced by 20%

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

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

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 synchronous reactance
 load angle
 both 1and 2
 excitation

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 200Hz.
 150Hz.
 100Hz.
 50Hz.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 6 V
 somewhat less than 230 V
 somewhat more than 230 V
 230 V

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