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Heat and Mass Transfer

Heat and Mass Transfer
All radiations in a black body are

Transmitted
Absorbed
Reflected
Refracted

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Heat and Mass Transfer
Thermal diffusivity is

A physical property of the material
Function of temperature
Used as mathematical model
A dimensionless parameter

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Melting of ice
Boiler furnaces
Condensation of steam in condenser
None of these

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Heat and Mass Transfer
The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as

Thermal conductivity
Thermal resistance
None of these
Thermal coefficient

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Heat and Mass Transfer
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

160 mm
25 mm
40 mm
800 mm

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

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