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Heat and Mass Transfer

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

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

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Heat and Mass Transfer
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

α = 1, ρ = 0 and τ = 0
α = 0, ρ = 0 and τ = 1
α = 0, ρ = 1 and τ = 0
α + ρ = 1 and τ = 0

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Heat and Mass Transfer
The critical temperature is the temperature

Above which a gas will never liquefied
Below which a gas is always liquefied
Below which a gas does not obey gas laws
Above which a gas may explode

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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

None of these
Thermal resistance
Thermal coefficient
Thermal conductivity

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Heat and Mass Transfer
Thermal diffusivity is a

Physical property of a substance
Function of temperature
All of these
Dimensionless parameter

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Heat and Mass Transfer
Thermal conductivity of air with rise in temperature

Increases
Decreases
May increase or decrease depending on temperature
Remain constant

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