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Heat and Mass Transfer

Heat and Mass Transfer
Free convection flow depends on

Coefficient of viscosity
All of these
Density
Gravitational force

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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

Two
Four
Three
One

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Heat and Mass Transfer
When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a

Opaque body
Black body
Grey body
White body

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Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

P = 0, x = 1 and a = 0
P = 0, x = 0 and a = 1
X = 0, a + p = 0
P= 1, T = 0 and a = 0

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Heat and Mass Transfer
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Greater than one
Less than one
Equal to Nusselt number
Equal to one

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Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Directly proportional to the difference of temperatures between the two bodies
Directly proportional to the surface area
Both (A) and (B)
Either (A) or (B)

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