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Heat and Mass Transfer

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

4 TR
8 TR
10 TR
2 TR

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Heat and Mass Transfer
The heat transfer by conduction through a thick sphere is given by

Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1)

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Heat and Mass Transfer
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

All of these
Counter flow
Parallel flow
Cross flow

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Heat and Mass Transfer
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Conduction and convection
Radiation
Convection
Conduction

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Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

270
3
9
81

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Heat and Mass Transfer
The energy distribution of an ideal reflector at higher temperatures is largely in the range of

Shorter wavelength
Longer wavelength
Wavelength has nothing to do with it
Remain same at all wavelengths

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