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Electrical Machines

Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  s2.
  sf / 2.
  sf.
  f / s.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Collecting of large current is simple.
All of these
 Operating cost is less.
 Insulation requirement is less.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of starting winding.
All of these
 reversing the terminals of main winding.
 interchanging the capacitor from starting winding to main winding or vice versa.

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Electrical Machines
A DC generator without commutator is a

 induction motor
 AC generator
 DC generator
 DC motor

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Saddle shape.
 Triangular and directed towards brush axis.
 Peaky in nature.
 Triangular and directed towards main pole.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 volume of iron.
 iron loss.
 reluctance of core.

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