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Heat and Mass Transfer

Heat and Mass Transfer
The value of Prandtl number for air is about

0.7
1.7
0.1
0.3

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

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Heat and Mass Transfer
The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called

First law of thermodynamics
Stefan's law
Newton's law of cooling
Newton's law of heating

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Heat and Mass Transfer
When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

Conduction and convection
Radiation
Convection
Conduction

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

Water
Solid ice
Melting ice
Steam

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Heat and Mass Transfer
The heat transfer by conduction through a thick sphere is given by

Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1)

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