Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 remains unaffected
 any of the above
 decreases
 increases

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Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

 The direction of rotation will reverse.
 The motor will run much faster in the same direction.
  The motor will run at its normal speed in the same direction as before.
 The motor will stop.

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

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

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