Important Electrical Machine Design Multiple Choice Questions and Answers

46.  Dispersion coefficiant is the ratio of

   A. Magnetizing current to supply voltage

   B. Magnetizing current to ideal short circuit current

   C. Magnetizing current two full load current

   D. None of the above

47.  Synchronous cusps in torque speed curve of a three-phase induction motor is due to

   A.. Even harmonics

   B. Odd harmonics

   C. Both odd and even harmonics

   D. None of the above

48.  Skewing of slots

   A. Improves heat transfer

   B. Reduces noise

   C. Suppresses the undesirable harmonics

   D. None of the above

49.  A large value of short circuit current is an indication of

   A. Good power factor

   B. Poor power factor

   C. Zero power factor

   D. Unity power factor

50.  The ratio of magnetizing current to ideal short circuit current is called the

   A. Leakage coefficient

   B. Short-circuit ratio

   C. Dispersion co efficient

   D. None of the above

< 1 2 3 4 5 6 7 8 9 10