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
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D. 1550C
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27. The basic considerations in the design of insolation are
A. Mechanical considerations
B. Electrical considerations
C. Thermal consideration
D. All of the above
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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
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29. Losses in the machine increases as the........... of the linear dimensions of the machine
A. Inverse
B. Inverse square
C. Cube
D. Square
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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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