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Heat and Mass Transfer

Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

9
81
270
3

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Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of

0.1
0.51
0.42
0.23

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Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

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

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Heat and Mass Transfer
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Pb = pa + pv
Pb = pa/pv
Pb = pa × pv
Pb = pa - pv

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Heat and Mass Transfer
The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to

Peclet number
Grashoff number
Biot number
Stanton number

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

Steam
Solid ice
Water
Melting ice

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MORE MCQ ON Heat and Mass Transfer

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