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Heat and Mass Transfer

Heat and Mass Transfer
According to Stefan's law, the total radiation from a black body per second per unit area is proportional to

T
Absolute temperature
T2
T5

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Heat and Mass Transfer
Log mean temperature difference in case of counter flow compared to parallel flow will be

Same
Less
Depends on other factors
More

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Heat and Mass Transfer
The critical thickness of insulation for a sphere is

h₀/2k
k/h₀
2k/h₀
h₀/k

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Heat and Mass Transfer
The ratio of surface convection resistance to the internal conduction resistance is known as

Grashoff number
Prandtl number
Stanton number
Biot number

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Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

Radiation
Conduction and convection
Conduction
Convection

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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.)

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

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MORE MCQ ON Heat and Mass Transfer

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