ELECTRICAL MACHINES QUIZ

 Slip.

 Running torque.

 Line voltage.

 Rotor current.

 not dependent on the slip

 inversely proportional to slip

 either of these

 directly proportional to slip

 Auto transformer starter.

 DOL starter.

 Star-delta starter.

  All of these.

  To convert alternating supply current to direct current.

  None of these.

  To absorb the mechanical shocks produced during running condition.

  To increase the flux cutting by the rotor.

 trapezoidal.

 rectangular.

  triangular.

 sinusoidal.

 to counteract demagnetizing effect of armature mmf in commutating zone.

  to make commutation spark less.

  both (B) and (C).

 to counteract the reactance voltage and the cross-magnetizi

 1/√2

 1/√5

 1/3

 2/√5

 reduced by 20%

 increased by 10%

 reduced by 10%

 increased by 20%

 convert ac armature current in to dc

 reduce eddy current loss

 collecting of current without any sparkings

 collecting of voltage

 K×R1

 R1 /K

 K²R1

 R1 /K²