Important Electrical Machine Design Multiple Choice Questions and Answers


41.  For small induction motors, the ratio of length to pole pitch is taken as


   A. 0.25

   B. 0.6

   C. 1.0

   D. 1.5


✔ View Answer


B. 0.6

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42.  In case of induction motor is the ratio of length to pole pitch for good efficiency is taken as


   A. 1.0

   B. 1.2 to 2

   C. 1.5

   D. 0.6 to 2


✔ View Answer


C. 1.5

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43.  In case of sleep ring induction motor the full load Road or mmf is taken as ..........percent of stator mmf


   A. 85

   B. 65

   C. 45

   D. 95


✔ View Answer


A. 85

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44.  The effects of harmonics in rotating machines can be reduced or eliminated by


   A. Using distributed winding

   B. Skewing the poles

   C. Increasing air gap length

   D. All of the above


✔ View Answer


D. All of the above

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45.  Under full load condition the power factor of the rotor circuit of three phase induction motor is


   A. About 0.2 lagging

   B. about 0.5 lagging

   C. Almost unity

   D. About 0.8 lagging


✔ View Answer


C. Almost unity

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