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Heat and Mass Transfer

Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

8 TR
2 TR
4 TR
10 TR

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Heat and Mass Transfer
Cork is a good insulator because it has

Low density
Atoms colliding frequency
Porous body
Free electrons

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Heat and Mass Transfer
Total heat is the heat required to

Convert water into steam and superheat it
Change liquid into vapour
Change vapour into liquid
Increase the temperature of a liquid or vapour

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Heat and Mass Transfer
The thermal diffusivities for gases are generally

Less than those for liquids
Dependent on the viscosity
More than those for liquids
More than those for solids

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Heat and Mass Transfer
All radiations in a black body are

Refracted
Transmitted
Reflected
Absorbed

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Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

Absorptive power
Emissivity
None of these
Emissive power

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