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Heat and Mass Transfer

Heat and Mass Transfer
Heat transfer in liquid and gases takes place by

Radiation
Conduction
Conduction and convection
Convection

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Heat and Mass Transfer
The amount of radiation mainly depends on

Nature of body
Type of surface of body
Temperature of body
All of these

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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
0.02
0.002
0.01

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Heat and Mass Transfer
Free convection flow depends on

Coefficient of viscosity
All of these
Density
Gravitational force

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Heat and Mass Transfer
The amount of heat flow through a body by conduction is

Directly proportional to the temperature difference on the two faces of the body
Dependent upon the material of the body
All of these
Directly proportional to the surface area of the body

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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)

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

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MORE MCQ ON Heat and Mass Transfer

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