Important Electrical Machine Design Multiple Choice Questions and Answers

41.  The flashpoint of transformer oil should be higher then

   A. 40⁰C

   B. 60⁰C

   C. 80⁰C

   D. 104⁰C

42.  Helical windings are used in

   A. Distribution transformers

   B. Power transformers

   C. Shell type transformers

   D. None of the above

43.  Cylindrical windings using circular conductors, employed in transformers, are

   A. Single layered

   B. Double layered

   C. Multi layered

   D. None of the above

44.  In Transformers using hotrolled steel, the cross-section of the yoke is made about...... greater than that of the core

   A. 5%

   B. 10%

   C. 15%

   D. None of the above

45.  Yokes with a rectangular cross-section are used of

   A. Small capacity transformers

   B. Medium capacity transformers

   C. Large capacity transformers

   D. Any of the above

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