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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1/S
 1/(1-S)
 1-S

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 48.5Hz
 51.5Hz
 1.5Hz
 2.5Hz

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

 armature current
 armature flux
All of these
 armature mmf

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  sinusoidal.
  flat topped.
  pulsating.
 triangular.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 0°
 less than 90°
 Greater than 90°
 90°

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 45°
 30°
 60°
 10°

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