Chemical Engineering MCQs

Page No. 489

Correct use of ‘factor of safety’ is very important in equipment design. It is defined as the ratio of the___________________?


aUltimate stress to breaking stress


bUltimate stress to working stress


cWorking stress to ultimate stress


dNone of these



For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by____________________?


aDi, opt = 3 Q0.36 ρ0.18


bDi, opt = 3.9 Q0.45 ρ0.23


cDi, opt = 7.6 Q0.36 ρ0.9


dDi, opt = 3 Q0.36 ρ1.86 μ0.08



Which of the following material is seldom used for pressure vessel construction ?


aRimmed still


bMild steel


cKilled steel


dSemi-killed steel


View Answer Rimmed still

The stress developed in a material without any permanent set is called the____________________?


aUltimate stress


bYield stress


cElastic limit


dBreaking stress


View Answer Elastic limit

Column support for the roof of cylindrical storage tank must be provided for___________________?


aSmall diameter tanks


bLarge diameter tanks


cSmall diameter tall tanks


dAll tanks irrespective of their heights and diameters


View Answer Large diameter tanks

Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if___________________?


aPlain carbon steel and cast iron parts are used


bWall thickness is > 30 mm


cMaterial of construction is high alloy steelof construction is high alloy steel


dBoth B. & C.


View Answer Both B. & C.

Height of the flights in the rotary drier is in the range of___________________?


a0.08 to 0.12 d


b0.02 to 0.05 d


c0.2 to 0.5 d


d0.5 to 0.6 d


View Answer 0.08 to 0.12 d

The function of manholes provided in the shell of a distillation column is to __________________?


aKeep a check on the liquid gradient over the plate by direct visual observation


bGive access to the individual trays for cleaning, maintenance and installation


cGuard against foaming & entrainment by dumping antifoaming agent through it


dAll A., B. and C.



Pick out the wrong statement about the design of sieve plate column and the bubble cap column ?


aThe downcomer design and the residence time in the downcomer is almost same for sieve plate and bubble cap columns


bWeir length for a bubble cap plate is the same as that for the sieve plate


cWeir height for a bubble cap plate column is the same as that for a sieve plate column


dWeir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the sieve plate



Back-trapping in a distillation column results due to_________________?


aLow gas velocity


bHigh gas velocity


cExcessive liquid gradient over the tray


dLow reflux ratio



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