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Engineering
Mechanical
ME Set-3
Heat transfer
62

Heat transfer MCQ with Answers

62) The value of Prandtl number for air is about

0.1

0.3

0.7

1.7

Answer is:

0.7

Heat transfer MCQ with Answers

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Related Heat transfer MCQ with Answers

63) The value of the wavelength for maximum emissive power is given by —

Wien′s law

Planck′s law

Stefan′s law

Fourier′s law

Answer is:

Wien′s law

64) Log mean temperature difference in case of counter flow compared to parallel flow will be

same

more

less

depends on other factors

Answer is:

more

65) The energy distribution of an ideal reflector at higher temperatures is largely in the range of

shorter wavelength

longer wavelength

remains same at all wavelengths

wavelength has nothing to do with it

Answer is:

shorter wavelength

66) Total emissivity of polished silver compared to black body is

same

higher

more or less same

very much lower

Answer is:

very much lower

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