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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 1 V
 0 V
 4 V

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 armature winding
 interpole winding
 field winding
 interpole and compensating windings together

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the iron loss
 increase the maintenance and repair
All of these
 increases the design cost

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

  convection.
 conduction.
All of these
 radiation.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 2 to 3.
 3 to 5.
  1.5 to 2.
 1.0.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 cummulative compound motor.
 AC synchronous motor.
 shunt motor.
  series motor.

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