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Heat and Mass Transfer

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

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

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Heat and Mass Transfer
Depending on the radiating properties, body will be transparent when (Where a = absorptivity, p = reflectivity, x = transmissivity)

P = 0, x= 1, and a = 0
P = 0, x = 0 and a = 1
X = 0, a + p = 1
P=1, x = 0, and a = 0

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Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

Conduction and convection
Convection
Radiation
Conduction

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Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

J/m °K sec
W/m °K
J/m² sec
Option (B) and (C) above

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Heat and Mass Transfer
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

Minimum energy
Both (A) and (B)
None of these
Maximum energy

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