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Heat and Mass Transfer

Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

Convection
Radiation
Conduction and convection
Conduction

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

Full radiation
Black radiation
Total radiation
All of these

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Heat and Mass Transfer
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

Cross flow
All of these
Parallel flow
Counter flow

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

All of these
Temperature
Physical nature
Wave length

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

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Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Solid ice
Steam
Water
Melting ice

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