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Heat and Mass Transfer

Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

watt2/cm °K⁴
watt/cm3 °K
watt/cm2 °K⁴
watt/cm4 °K

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

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Heat and Mass Transfer
Upto the critical radius of insulation,

Convective heat loss will be less than conductive heat loss
Added insulation will increase heat loss
Added insulation will decrease heat loss
Heat flux will decrease

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

8 TR
4 TR
10 TR
2 TR

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Heat and Mass Transfer
The emissivity for a black body is

0.75
1
0.5

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Heat and Mass Transfer
Planck’s law holds good for

polished bodies
all coloured bodies
black bodies
All of these

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