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Process Equipment and Plant Design

Process Equipment and Plant Design
__________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids.

Packed
Bubble cap plate
None of these
Sieve plate

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Process Equipment and Plant Design
The main purpose of providing stepping on the trays is to

Facilitate handling of large flow rate of liquid
Improve the flow condition
Decrease the pressure drop
Increase the residence time

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Process Equipment and Plant Design
For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by

Di, opt = 7.6 Q0.36 . ρ0.9
Di, opt = 3 Q0.36 . ρ1.86 μ0.08
Di, opt = 3 Q0.36 ρ0.18
Di, opt = 3.9 Q0.45 . ρ0.23

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to

∞
1
20.8
2

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Process Equipment and Plant Design
Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

Ponchon-Savarit method
Sorel-Lewis method
None of these
McCabe-Thiele's method

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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

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

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