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Heat and Mass Transfer

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

4 TR
8 TR
2 TR
10 TR

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Heat and Mass Transfer
The emissive power of a body depends upon its

Physical nature
Wave length
All of these
Temperature

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Heat and Mass Transfer
A perfect black body is one which

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

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

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Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

None of these
Absorptive power
Emissive power
Emissivity

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Heat and Mass Transfer
Moisture would find its way into insulation by vapour pressure unless it is prevented by

High thickness of insulation
High vapour pressure
Less thermal conductivity insulator
A vapour seal

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