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Heat and Mass Transfer

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

Biot number
Stanton number
Prandtl number
Grashoff number

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Heat and Mass Transfer
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by

K.cal (heat)
Sq. m (area)
°C (temperature)
Hr (time)

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

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

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Heat and Mass Transfer
Free convection flow depends on

Density
All of these
Gravitational force
Coefficient of viscosity

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Heat and Mass Transfer
A perfect black body is one which

Reflects all heat
Is black in colour
Absorbs heat radiations of all wave lengths falling on it
Transmits all heat radiations

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Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Parallel flow type
Cross flow type
Counter flow type
Regenerator type

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