Chemical Engineering MCQs

Page No. 504

A/an _______________ is used for changing the direction of a pipeline?


aElbow


bUnion


cFlange


dDisc compensator


View Answer Elbow

In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________?


aSame as that for fluid flow


bLess than that for fluid flow


cMore than that for fluid flow


dD2 – D1 (D1 and D2 are I.D. of inner and outer pipes respectively)



At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure____________________?


aIncreases


bDecreases


cRemain same


dMay increase or decrease depending upon the solubility of the gas in the liquid


View Answer Remain same

In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed ______________ of the column diameter?


a1/5th


b1/15th


c1/30th


d1/50th


View Answer 1/15th

Frame thickness in the plate and frame filter press is normally in the range of ______________ inches?


a0.25 to 4


b0.25 to 8


c1 to 5


d1 to 12


View Answer 0.25 to 8

In a shell and tube heat exchanger, the clearance of the tube is generally___________________?


aNot less than one-fourth of the tube diameter or 3/16″


bMore than the tube diameter


cEqual to the tube diameter


dMore in case of triangular pitch as compared to the square pitch tube layout



The length of straight rectangular weir used on cross-flow trays is generally ________________ the column diameter ?


a0.6-0.8 times


bEqual to


cTwice


d2 ft irrespective of (for column > 3 ft diameter)


View Answer 0.6-0.8 times

Cylindrical shell thickness of rotary drier is generally _______________ mm?


a2-3


b18-22


c6-8


d12-15


View Answer 6-8

The necessary wall thickness for a metallic storage vessel is a function of the ___________________?


aUltimate tensile strength (or yield point) of the material and operating temperature


bOperating pressure and welding/joint efficiency


cDiameter of the vessel


dAll A., B. and C.


View Answer All A., B. and C.

In distillation columns, bubble caps are held in place over trays by ________________?


aRivets


bA hold down bar


cBolts


dBoth B. and C.


View Answer Both B. and C.

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