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Process Equipment and Plant Design

Process Equipment and Plant Design
The retention time of material in a rotary dryer depends upon its

Slope & length
All of these
Rpm
Flights arrangement

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Process Equipment and Plant Design
A perforated plate has holes of diameter dh arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by

(ph - dt)/ph
(ph - dh)/dh
(ph - dh . dt/2)/ph
(ph - dh)/ph

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Process Equipment and Plant Design
The minimum baffle height should be

Equal to the impeller diameter
Twice the tank diameter
Twice the impeller diameter
3/4 of the tank height

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Process Equipment and Plant Design
Filtration rate is affected by the

Area of filtering surface & the viscosity of filtrate
Pressure drop across the cake & filter medium
Cake & filter medium resistance
All of these

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Process Equipment and Plant Design
Which of the following packing materials provides for maximum mass transfer?

Raschig rings
All of these
Cross-partition rings
Lessig rings

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Process Equipment and Plant Design
Which of the following is used to set the diameter of the distillation column?

Static submergence
Number of theorectical plates
Allowable vapour velocity
Length of straight rectangular weir on cross-flow tray

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