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Electrical Machines

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

 50Hz.
 150Hz.
 200Hz.
 100Hz.

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Limit the flux.
 Avoid sparking.
 Limit the current.
  Limit the speed.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V2
 f2
 f
 V

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 remains same.
  increased.
 decreased.
 kept constant to certain value.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  V connection.
  star connection.
  delta connection.
  zig - zag connection.

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Electrical Machines
Generator works on the principle of production

 static induced emf.
 both A and B.
None of these
 dynamically induced emf.

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MORE MCQ ON Electrical Machines

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