Important Electrical Machine Design Multiple Choice Questions and Answers

26.  Maximum temperature limit for class F installation

   A. 105⁰C

   B. 120⁰C

   C. 130⁰C

   D. 155⁰C

27.  The basic considerations in the design of insolation are

   A. Mechanical considerations

   B. Electrical considerations

   C. Thermal consideration

   D. All of the above

28.  In case of air natural cooling, the cooling surface increases as the ...........of the linear dimensions

   A. Square

   B. Inverse

   C. Cube

   D. Inverse square

29.  Losses in the machine increases as the........... of the linear dimensions of the machine

   A. Inverse

   B. Inverse square

   C. Cube

   D. Square

30.  heat convected depends on

   A. Gravitational constant

   B. Thermal resistivity, density, specific heat

   C. Temperature difference of heated surface and coolant

   D. All of the above

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