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Process Equipment and Plant Design

Process Equipment and Plant Design
Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.

SO₂
CO₂
None of these
NH₃

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Process Equipment and Plant Design
Heat transfer co-efficient, hG(Kcal/hr.m² .°C) and mass velocity of air, G (kg/hr.m² ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

1.004G0.8
HG = 1.004G0.37
HG = 0.0176G0.37
0.0176G1.37

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Process Equipment and Plant Design
Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about __________ kcal/hr.m².°C.

2500
1250
7500
15000

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Process Equipment and Plant Design
For high pressure process equipments/vessels, the connected nozzle should be

Welded
Brazed
Flanged
Screwed

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Process Equipment and Plant Design
Brass valves are usually made for pipe sizes __________ inches.

?2
>2.5
?1
>3.5

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Process Equipment and Plant Design
The ratio of down take area to cross-sectional area of the tube, for calendria type evaporator ranges from

2 to 2.5
1 to 1.5
0.5 to 1
1.5 to 2

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