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Heat and Mass Transfer

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

8 TR
10 TR
2 TR
4 TR

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

Radiation
Convection
Conduction
Conduction and convection

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Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Steam
Solid ice
Water
Melting ice

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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)

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

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Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as

Radiation
Conduction
Free convection
Forced convection

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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

Emissivity
Absorptive power
None of these
Emissive power

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