Heat Transfer
The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.

Increases
Remains constant
Decreases
May increase or decrease ; depends on the material

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Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature
Presence of a non-condensible gas decreases the condensing film co-efficient
Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes
All of these

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