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Heat and Mass Transfer

Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Radiation
Conduction
Convection
Conduction and radiation combined

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Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

1/h₁ + 1/h₂ + 1/h₃
None of these
h₁ + h₂ + h₃
(h₁.h₂.h₃)1/3

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Heat and Mass Transfer
The use of heat exchangers is made in

Radiators in automobile
Condensers and boilers in steam plants
Condensers and evaporators in refrigeration and air conditioning units
All of these

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

Solids
Gases
None of these
Liquids

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

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

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Heat and Mass Transfer
Total heat is the heat required to

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

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MORE MCQ ON Heat and Mass Transfer

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