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Heat and Mass Transfer

Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

3
9
270
81

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Heat and Mass Transfer
When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a

Grey body
Black body
White body
Opaque body

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.01
0.002
0.1
0.02

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Heat and Mass Transfer
The heat of sun reaches to us according to

Conduction
Radiation
Convection
None of these

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

10 TR
2 TR
8 TR
4 TR

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Heat and Mass Transfer
Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

(L.H - S.H)/S.H
S.H/(L.H - S.H)
S.H/(S.H + L.H)
(S.H + L.H) /S.H

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