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Heat and Mass Transfer

Heat and Mass Transfer
The transfer of heat by molecular collision is known as

Conduction
None of these
Convection
Radiation

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

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

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Heat and Mass Transfer
A non-dimensional number generally associated with natural convection heat transfer is

Nusselt number
Grashoff number
Prandtl number
Weber number

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Heat and Mass Transfer
When heat is transferred by molecular collision, it is referred to as heat transfer by

Scattering
Convection
Radiation
Conduction

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Heat and Mass Transfer
40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

0.75
0.55
0.45
0.4

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

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

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