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Heat and Mass Transfer

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

10 TR
2 TR
4 TR
8 TR

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Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in heat transfer problems of

Conduction and convection
Convection
Conduction
Radiation

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Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

Kind and extent of its surface
All of these
Its temperature
Nature of the body

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

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Heat and Mass Transfer
Thermal conductivity of non-metallic amorphous solids with decrease in temperature

Decreases
May increase or decrease depending on temperature
Increases
Remain constant

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Heat and Mass Transfer
Which of the following property of air does not increase with rise in temperature?

Density
Dynamic viscosity
Thermal diffusivity
Thermal conductivity

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