Chemical Engineering MCQs

Page No. 483

If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will _____________ times?


aIncrease by 1.8


bDecrease by 22


cIncrease by 21.6


dNone of these


View Answer Increase by 21.6

For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between ______________________ times the tank diameter?


a1 to 1.5


b2.5 to 3.5


c4 to 5


d6 to 8


View Answer 1 to 1.5

Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation ?


aSorel-Lewis method


bMcCabe-Thiele’s method


cPonchon-Savarit method


dNone of these


View Answer Sorel-Lewis method

Fouling factor must be included in the calculation of overall design heat transfer coefficient, when the liquid__________________?


aContaining suspended solids flows at low velocity


bContaining suspended solids flows at high velocity


cIs highly viscous


dIs of high specific gravity



Overall tray efficiency of a distillation column is the ratio of the number of ___________________?


aOverall gas transfer units to the number of ideal trays required


bIdeal trays required to the number of real trays required


cReal trays required to the number of ideal trays required


dNone of these



An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by______________?


aAn increase in liquid viscosity


bAn increase in relative volatility for rectification columns


cDecrease in gas solubility for absorbers


dAll A., B. and C.


View Answer All A., B. and C.

Vertical condenser is advantageous to the horizontal condenser from operation point of view, when________________?


aHydrostatic head is required for refluxing the condensate


bOnly the function of condensation is to be carried out


cSub-cooling of condensate is desired


dBoth the functions of condensation & sub cooling are carried out in a single unit



The circumferential (hoop) stress in a thin walled cylindrical vessel under internal pressure is______________________?


apd/2t


bpd/4t


cpd/t


dpd/3t


View Answer pd/2t

Pick out the correct statement___________________?


aCentre to centre distance between two consecutives rivets in a row is called the pitch


bA riveted joint made in overlapping plates is called butt joint


cHole size drilled in riveted plates is less than the actual size of the rivet


dNone of these



n the agitators, the power required will be changed with the increase of diameter of agitator D. as ____________________?


aD2


bD5


cD


dD9


View Answer D5

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