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Heat and Mass Transfer

Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Higher
Depends upon the shape of body
Same
Lower

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

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

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

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

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Heat and Mass Transfer
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

One
Four
Three
Two

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Heat and Mass Transfer
The thermal diffusivities for solids are generally

Less than those for gases
More than those for liquids and gases
More or less same as for liquids and gases
Less than those for liquids

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Heat and Mass Transfer
The amount of radiation mainly depends upon the

Nature of the body
Type of surface of the body
All of these
Temperature of the body

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