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Heat Transfer

Heat Transfer
Removal of __________ heat is involved in the condensation of a vapor under saturated conditions.

Latent
Both B & C
Super
Sensible

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Heat Transfer
Multiple effect evaporation is generally recommended, when the

Fuel is cheaply available
Corrosive liquids are to be concentrated
Evaporation on small scale is to be done
Large scale evaporation of liquor is needed

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Heat Transfer
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Occupies smaller space
Is easy to operate and maintain
Is more economical
All of these

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Heat Transfer
Choose the correct equation.

Nu = (Pr)(St)
Nu = (Re) (Pr) (Gz)
Nu = (Re) (Pr) (St)
Nu = (Re)(Pr)

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Heat Transfer
For concentrating an aqueous solution of a material like anhydrous Na₂SO₄, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.

High pressure
Vacuum
None of these
Backward feed

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Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

37
50
45
32

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