Important Electrical Machine Design Multiple Choice Questions and Answers

46.  Multilayer helical windings are commonly used in the transformers as high voltage windings

   A. Up to 20 KV

   B. Up to 50 KV

   C. Up to 80 KV

   D. Upto 110 KV and above

47.  Disc windings are primarily used in

   A. Short capacity transformers

   B. Medium capacity transformers

   C.High capacity transformers

   D. Any of the above

48.  Transformers with a capacity of up to ...........have a cooling radiator system with natural cooling

   A. 2 MVA

   B. 5 MVA

   C. 7.5 MVA

   D. 10 MVA

49.  The forced oil and air circulation method is usual one for transformers of capacities

   A. Upto 5 MVA

   B. Upto 10 MVA

   C. Upto 20 MVA

   D. 30 MVA upwards

50.  The high-voltage winding is usually which of the following type?

   A. Cylindrical winding with circular conductors

   B. Cross over winding with either circular or small rectangular conductors

   C. Continuous disc type winding with rectangular conductors

   D. All of the above

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