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Heat and Mass Transfer

Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

watt/cm2 °K⁴
watt/cm4 °K
watt2/cm °K⁴
watt/cm3 °K

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Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

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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Heat and Mass Transfer
In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

Same
Less
None of these
Greater

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

T2
Absolute temperature
T
T5

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Heat and Mass Transfer
Free convection flow depends on

All of these
Density
Coefficient of viscosity
Gravitational force

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

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