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


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D. 1040C

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42.  Helical windings are used in


   A. Distribution transformers

   B. Power transformers

   C. Shell type transformers

   D. None of the above


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B. Power transformers

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


   A. Single layered

   B. Double layered

   C. Multi layered

   D. None of the above


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C. Multi layered

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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


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C. 15%

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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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A. Small capacity transformers

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