Chemical Engineering MCQs

Page No. 498

The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is_________________?


a< 30


b< 7


c> 7


d< 50


View Answer < 7

For identical situation, condensing film coefficient in case of a horizontal condenser is almost ______________ the value expected in case of vertical condenser?


aHalf


bTwice


cThrice


dFive times


View Answer Thrice

Length to diameter ratio of most rotary driers is in the range of____________________?


a1 to 2


b4 to 10


c10 to 20


d20 to 30


View Answer 4 to 10

Apex angle of conical heads used in the bottom heads of chemical process equipments is usually__________________?


a30°


b45°


c60°


d75°


View Answer 60°

Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder _________________?


aHas greater structural strength


bIs easy to fabricate


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will________________?


aIncrease


bDecrease


cRemain unaffected


dIncrease or decrease depending on the nature of the dust


View Answer Increase

“A claming section” before the liquid flows into the downcomer is provided to__________________?


aPermit release of entrained vapour in the liquid


bReduce the discharge fluctuation


cEnsure better vapour-liquid contact


dCool the liquid before it flows down



In sieve plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally ______________ times the hole diameter to give the required hole area?


a0.5 to 1.5


b2.5 to 4.0


c5 to 10


d10 to 15


View Answer 2.5 to 4.0

In a shell and tube heat exchanger, tube side _______________ of the mass velocity?


aHeat transfer co-efficient is proportional to 0.8th power


bPressure drop is proportional to the square


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line) ?


aS1/S2


bS1.S2


cS2/S1


d1/S1.S2


View Answer S1/S2

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