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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 decrease
 either increase or decrease
 increase

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  Reluctance motor.
  Capacitor type induction motors.
  DC series motor.
  AC slip ring IM.

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

  4.
 32.
 8.
 16.

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 14.28%.
 15.30%.
 18.25%.
 16.67%.

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Electrical Machines
Alternator operates on the principle of

  electromagnetic induction.
  mutual induction.
  self induction.
  self or mutual induction.

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Electrical Machines
Dummy coils are used for

 mechanical balancing.
 increasing efficiency.
 reducing armature reaction.
All of these

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