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Heat and Mass Transfer

Heat and Mass Transfer
All radiations in a black body are

Reflected
Absorbed
Refracted
Transmitted

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Heat and Mass Transfer
Which of the following property of air does not increase with rise in temperature?

Thermal diffusivity
Density
Dynamic viscosity
Thermal conductivity

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Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

U/A.Cmin
Cmin/U
U/Cmin
U.Cmin

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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)

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

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Heat and Mass Transfer
Fouling factor is used

None of these
In heat exchanger design as a safety factor
In case of Newtonian fluids
When a liquid exchanges heat with a gas

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

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