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Heat and Mass Transfer

Heat and Mass Transfer
Log mean temperature difference in case of counter flow compared to parallel flow will be

Depends on other factors
Less
Same
More

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Heat and Mass Transfer
The critical thickness of insulation for a sphere is

k/h₀
2k/h₀
h₀/k
h₀/2k

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Heat and Mass Transfer
Total heat is the heat required to

Convert water into steam and superheat it
Change vapour into liquid
Increase the temperature of a liquid or vapour
Change liquid into vapour

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Heat and Mass Transfer
The product of Reynolds number and Prandtl number is known as

Grashoff number
Stanton number
Peclet number
Biot number

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Hot medium outlet and cold water inlet
Hot medium outlet and cold water outlet
Cold water inlet and outlet
Hot medium inlet and outlet

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Heat and Mass Transfer
In case of liquids and gases, the heat transfer takes place according to

Conduction
Convection
None of these
Radiation

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MORE MCQ ON Heat and Mass Transfer

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