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Process Equipment and Plant Design

Process Equipment and Plant Design
Length to diameter ratio of most rotary driers is in the range of

10 to 20
1 to 2
20 to 30
4 to 10

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Process Equipment and Plant Design
In shell and tube heat exchangers, straight tie rods are used to

Account for thermal strain
Hold baffle in space
None of these
Fix the tubes in position

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Process Equipment and Plant Design
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around

300 and 500
5 and 10
45 and 75
180 and 300

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

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Process Equipment and Plant Design
In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)

D₂ - D₁
None of these
(D₂² - D₁²)/D₁²
(D₂² - D₁²)/D₂²

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Process Equipment and Plant Design
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of

None of these
20.8
2
20.2

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