Chemical Engineering MCQs

Page No. 477

Maximum plate efficiency is achieved in case of ______________ flow?


aSplit

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bCross

✓


cCascade

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dReverse

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View Answer Cross

Le/D) for 90° elbow (medium radius) and 90°square elbow would be respectively around___________________?


a25 and 60

✓


b3 and 5

✖


c100 and 250

✖


d250 and 600

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View Answer 25 and 60

Diameter of the sieve tray column is determined by the_________________?


aLower limit of vapour velocity

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bUpper limit of the vapour velocity

✓


cHole diameter of the sieve tray

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dHeight of the plate spacing

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Maximum acceptable total liquid gradient over a tray is about _______________ mm?


a5.5

✖


b12.5

✓


c12.5

✖


d45.5

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View Answer 12.5

A minimum clearance of about _______________ mm is maintained between the distillation column wall and the bubble cap?


a19

✖


b38

✓


c67

✖


d95

✖


View Answer 38

Seamless pipe is made________________?


aFrom rolled strips formed into cylinders and seam-welded

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bBy extrusion & casting into static and centrifugal molds

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cBy forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing

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dBoth B. and C.

✓


View Answer Both B. and C.

For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is_________________?


ad1/(d1 + d2)

✓


bd2/(d1 + d2)

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c(d1 + d2)/d1

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d(d1 + d2)/d2

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View Answer d1/(d1 + d2)

Optimum economic pipe diameter for fluid flow is determined by the____________________?


aViscosity of the fluid

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bDensity of the fluid

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cTotal cost considerations (pumping cost plus fixed cost of the pipe)

✓


dNone of these

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The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is____________________?


a0.25

✓


b0.50

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c0.75

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d1.25

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View Answer 0.25

Souders Brown equation given by, U = Kv √(ρl – ρv)/ρv, is used for the calculation of the ______________ in a continuous distillation column?


aDiameter of the bubble cap column

✓


bDiameter of the sieve plate column

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cTray pressure drop

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dResidence time in the downcomer for the disengagement of entrained vapour

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