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Heat and Mass Transfer

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

All of these
Black radiation
Total radiation
Full radiation

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Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Stefan’s law
Wine’s law
Kirchhoff’s law
Planck’s law

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Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Reynold's number, Grashoff's number
Reynold's number
Prandtl number, Grashoff's number
Grashoff's number

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

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Heat and Mass Transfer
Absorptivity of a body will be equal to its emissivity

At all temperatures
At critical temperature
At one particular temperature
When system is under thermal equilibrium

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Heat and Mass Transfer
The emissivity for a black body is

0.5
0.75
1

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MORE MCQ ON Heat and Mass Transfer

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