Electrical Machines
The mmf produced by rotor currents of a 3 - Φ induction motor

  rotates at the speed of rotor in the air gap.
  is at standstill with respect to stator mmf.
  rotates at slip speed with respect to stator mmf.
  rotates at synchronous speed with respect to rotor.

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Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?

 None of these.
  Rotation can be changed by reversing main winding terminals.
 Direction of rotation cannot be changed.
 Rotation can be changed by interchanging supply terminals.

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Electrical Machines
Flashing the field of DC generator means

 increasing flux density by adding extra turns of winding.
  neutralising residual magnetism.
  making the magnetic losses forces parallel.
  creating residual magnetism by a DC source.

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