Chemical Engineering MCQs

Page No. 477

Maximum plate efficiency is achieved in case of ______________ flow?


aSplit


bCross


cCascade


dReverse


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


View Answer 25 and 60

Diameter of the sieve tray column is determined by the_________________?


aLower limit of vapour velocity


bUpper limit of the vapour velocity


cHole diameter of the sieve tray


dHeight of the plate spacing



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


a5.5


b12.5


c12.5


d45.5


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


bBy extrusion & casting into static and centrifugal molds


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


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)


c(d1 + d2)/d1


d(d1 + d2)/d2


View Answer d1/(d1 + d2)

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


aViscosity of the fluid


bDensity of the fluid


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


dNone of these



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


c0.75


d1.25


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


cTray pressure drop


dResidence time in the downcomer for the disengagement of entrained vapour



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