ELECTRICAL MACHINES QUIZ

  either field terminals are reversed or armature terminals are reversed.

  only armature terminals are reversed.

  only field terminals are changed.

  none of above.

  None of these.

  Single phase induction motor.

  Poly-phase induction motor.

  Poly-phase synchronous machine.

 both A and B

 produce working flux

 flux path completion

 mechanical protection to the machine

 50 MW and 50 MW respectively

 any of the above

 66.67 MW and 33.33 MW respectively

 33.33 MW and 66.67 MW respectively

  Either short circuit or open circuit occurs.

  Fail to start.

  It will rotates in reverse direction.

  It will rotates in normal operation.

 250 W

 300 W

 500 W

 400W

  minimum of the static torque with the phase winding unexcited.

  maximum of the static torque with the phase winding unexcited.

  maximum of the static torque with the phase winding excited.

  minimum of the static torque with the phase winding excited.

All of these

 directly as Xs2

 inversely as 1/Xs

 directly as synchronous reactances Xs

 KhfBm3.

 Khf2Bm1.6.

 KhfBm.

  KhfBm1.6.

  creating residual magnetism by a DC source.

  making the magnetic losses forces parallel.

  neutralising residual magnetism.

 increasing flux density by adding extra turns of winding.