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Heat and Mass Transfer

Heat and Mass Transfer
The radiation emitted by a black body is known as

Full radiation
Black radiation
All of these
Total radiation

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

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

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

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

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Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = hl/k
RN = μ cp/k
RN = ρ V l /μ
RN = V²/t.cp

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Heat and Mass Transfer
Metals are good conductors of heat because

Their atoms collide frequently
Their atoms are relatively far apart
They contain free electrons
They have high density

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

Atoms colliding frequency
Porous body
Low density
Free electrons

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