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Heat and Mass Transfer

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

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

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Heat and Mass Transfer
A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

(k₁ + k₂)
k₁ k₂
(k₁ + k₂)/ k₁ k₂
2 k₁ k₂/ (k₁ + k₂)

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Heat and Mass Transfer
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

Two
Three
One
Four

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Heat and Mass Transfer
The transfer of heat by molecular collision is smallest in

Liquids
Gases
Solids
None of these

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Heat and Mass Transfer
The emissive power of a body depends upon its

All of these
Physical nature
Temperature
Wave length

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Heat and Mass Transfer
The amount of heat flow through a body by conduction is

Directly proportional to the surface area of the body
All of these
Directly proportional to the temperature difference on the two faces of the body
Dependent upon the material of the body

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