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Process Equipment and Plant Design

Process Equipment and Plant Design
__________ is the determining factor for the number of bubble caps to be used per tray.

Permissible slot velocity
Vapor load
Tray diameter
Liquid load

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Process Equipment and Plant Design
Le/D for a Tee (used as elbow, entering branch) would be

More than that for Tee (used as elbow, entering run)
Around 90
Both B and C
Less than that for Tee (used as elbow, entering run)

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Process Equipment and Plant Design
The ratio of shear stress to shear strain is called

Modulus of rigidity
Bulk modulus
Shear modulus
Modulus of elasticity

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Process Equipment and Plant Design
In a rotary drier, the average retention time of solid is(where Z = length of the drier, metres ρ = apparent solid density, kg/m³ L = flow rate of dry solids, kg/see. m² drier cross-section H = hold up of solid.)

Z.H.ρ/L
Z.H/L.ρ
L/Z.H.ρ
H.ρ/L

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Process Equipment and Plant Design
Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).

450
750
650
250

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Process Equipment and Plant Design
Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.

0 to 2.2
0 to 1.5
0 to 0.8
0 to 0.08

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