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Heat and Mass Transfer

Heat and Mass Transfer
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by

Hr (time)
°C (temperature)
K.cal (heat)
Sq. m (area)

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Heat and Mass Transfer
Fourier's law of heat conduction gives the heat flow for

Two dimensional cases only
One dimensional cases only
Nonuniform temperature surfaces
Irregular surfaces

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Wien's law
Kirchhoff's law
Planck's law
Stefan's law

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

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Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

W/m °K
Option (B) and (C) above
J/m² sec
J/m °K sec

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Heat and Mass Transfer
In a shell and tube heat exchanger, baffles are provided on the shell side to

Provide support for tubes
All of these
Prevent stagnation of shell side fluid
Improve heat transfer

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