ELECTRICAL MACHINES QUIZ

  starting the motor on load which is more than the rated load.

  locking of rotor due to harmonics.

  pulling the motor directly on line without a rotor.

  interchanging two supply phases for quick stopping.

 due to wrong direction of rotation.

 if field resistance is more than critical resistance.

  if it has lost residual magnetism.

 any one of above.

  copper losses.

 core loses only.

 eddy current loss.

 hysteresis loss.

 volume of copper.

 reluctance of core.

 volume of iron.

 iron loss.

 Armature current.

 Mechanical power.

 Can not be determined.

 Induced emf.

 double.

 one fourth.

 half.

 4 times.

 both Eb and Td are zero

 both Eb and Td are unchanged

 Eb is unchanged, but Td is zero

 Eb is zero, but Td is unchanged

 ∞

 a positive finite value

 a finite negative value

 0

  the generator runs on designed speed.

  the generator runs on overload.

  there is no load on the generator.

  the generator runs on full load.

 armature winding

 interpole and compensating windings together

 interpole winding

 field winding