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Heat and Mass Transfer

Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

watt/cm3 °K
watt/cm2 °K⁴
watt2/cm °K⁴
watt/cm4 °K

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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

Four
Three
One
Two

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Heat and Mass Transfer
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to

-1
=-2/3
=-1/3
1

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Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Nusselt number
Biot number
Stanton number
Peclet number

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Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Solid ice
Steam
Melting ice
Water

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

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

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