Important Electrical Machine Design Multiple Choice Questions and Answers

31.  The heat generated in a transformer is dissipated to surroundings mainly bye

   A. Conduction

   B. Convection

   C. Radiation

   D. Conduction and convection

32.  Temperature rise time curve is a

   A. Straight line

   B. Parabola

   C. Exponential curve

   D. Hyperbola

33.  In self coolled motors the cooling time constant is .........its heating time constant

   A. Equal to

   B. Smaller than

   C. Larger than

   D. Unpredictable

34.  In direct hydrogen gas cooling both starter and rotor conductors are made

   A. Solid

   B. Hollow

   C. Perforated

   D. Any of these

35.  Machines cooled by direct cooling may be called the

   A. Coductor cooled

   B. Inner cooled

   C. Super charged

   D. Any of these

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