Chemical Engineering MCQs

Page No. 493

Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than ______________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop?


a25


b50


c75


d150


View Answer 75

Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger________________?


aPermits the use of less tubes in a given shell diameter


bFacilitates comparatively easier external cleaning because of large clearance


cPermits the use of more tubes in a given shell diameter


dBoth B. and C.



To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of_________________?


a(1.2)3/2


b(1.2)3/5


c(1.2)2/3


d(1.2)5/3


View Answer (1.2)5/3

Friction factor for turbulent flow in a new pipe is given by____________________?


af = 16/NRe


bf = 0.04/(NRe)0.16


cf = 0.22 NRe


df = 25/NRe


View Answer f = 0.04/(NRe)0.16

Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as ‘d’ will be__________________?


ad


b√d


c√(2πd)


d√(2d)


View Answer d

The shell side pressure drop in a shell and tube heat exchanger is maximum for _______________ baffle?


aDisk and ring


bSegmental


cOrifice


dIndependent of the type of


View Answer Orifice

Width and depth of grooves in the tube sheet holes normally are _______________ inch respectively?


a1/8 and 1/64


b1/64 and 1/8


c1/2 and 8


d1/2 and 5


View Answer 1/8 and 1/64

Maximum size of the raschig rings used in a packed tower is about _______________ of the column diameter?


a1/10th


b1/20th


c1/30th


d1/50th


View Answer 1/30th

In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference ______________________?


aIs always less than arithmetic average value


bIs always more than arithmetic mean value and the geometric mean value


cIs always less than arithmetic mean value, but more than geometric mean value


dMay be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current



A pipe is generally made of circular cross-section, because a circular cross-section has the____________________?


aHigher structural strength


bLowest surface area requirement for a given volume


cBoth A. & B.


dNone of these


View Answer Both A. & B.

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