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Process Equipment and Plant Design

Process Equipment and Plant Design
Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as

D = 1.6 √t
D = 1.1 t
D = 3√t
D = 1.5 t

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Process Equipment and Plant Design
What is the slope of the operating line in the rectifying section of a distillation coloumn?

> 1
∞

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Process Equipment and Plant Design
In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.

200-250
50-75
750-1000
25-50

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Process Equipment and Plant Design
Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8").

1.5 times
Equal to
Half
Three fourth

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Process Equipment and Plant Design
With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.

Running cost of steam for reboiler
Fixed charges initially
Vapour & liquid load both
Running cost of cooling water for condenser

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Process Equipment and Plant Design
In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

1/2 to 1/4th
1/5-1/10th
1/10-1/15th
1/20-1/30th

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