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


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B. Magnetizing current to ideal short circuit current

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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


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B. Odd harmonics

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48.  Skewing of slots


   A. Improves heat transfer

   B. Reduces noise

   C. Suppresses the undesirable harmonics

   D. None of the above


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C. Suppresses the undesirable harmonics

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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


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A. Good power factor

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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


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C. Dispersion co efficient

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