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Heat and Mass Transfer

Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Higher
Depends upon the shape of body
Lower
Same

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.1
0.01
0.002
0.02

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

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

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

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

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Heat and Mass Transfer
Thermal conductivity of glass wool varies from sample to sample because of variation in

Porosity
Density
All of these
Composition

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

20°C
66.7°C
60°C
40°C

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MORE MCQ ON Heat and Mass Transfer

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