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Heat and Mass Transfer

Heat and Mass Transfer
The emissivity for a black body is

1
0.75
0.5

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Heat and Mass Transfer
In a shell and tube heat exchanger, baffles are provided on the shell side to

All of these
Provide support for tubes
Prevent stagnation of shell side fluid
Improve heat transfer

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

h₀/k
2k/h₀
k/h₀
h₀/2k

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Cold water inlet and outlet
Hot medium outlet and cold water inlet
Hot medium outlet and cold water outlet
Hot medium inlet and outlet

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Heat and Mass Transfer
Which of the following has maximum value of thermal conductivity?

Copper
Aluminium
Brass
Steel

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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
270
3
81

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MORE MCQ ON Heat and Mass Transfer

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