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Heat and Mass Transfer

Heat and Mass Transfer
The emissivity for a black body is

1
0.5
0.75

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

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

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Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Inversely proportional to
None of these
Directly proportional to
Equal to

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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

Counter flow
Parallel flow
Cross flow
All of these

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Heat and Mass Transfer
The value of the wavelength for maximum emissive power is given by

Stefan's law
Fourier's law
Wien’s law
Planck's law

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Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Conduction
Radiation
Forced convection
Free convection

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