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Heat and Mass Transfer

Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

4 TR
2 TR
10 TR
8 TR

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Heat and Mass Transfer
Upto the critical radius of insulation,

Convective heat loss will be less than conductive heat loss
Added insulation will increase heat loss
Added insulation will decrease heat loss
Heat flux will decrease

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Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Absorptive power
Emissive power
Absorptivity
Emissivity

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

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

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Heat and Mass Transfer
Thermal diffusivity is a

Dimensionless parameter
All of these
Function of temperature
Physical property of a substance

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Heat and Mass Transfer
The highest thermal diffusivity is of

Iron
Lead
Concrete
Wood

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