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HEAT AND MASS TRANSFER

Heat and Mass Transfer
Heat is closely related with

Energy
Liquids
Entropy
Temperature

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Heat and Mass Transfer
The thermal diffusivities for gases are generally

Dependent on the viscosity
More than those for solids
More than those for liquids
Less than those for liquids

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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
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = V²/t.cp
RN = ρ V l /μ
RN = μ cp/k
RN = hl/k

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Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

10 TR
8 TR
4 TR
2 TR

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