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

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bUltimate stress to working stress

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cWorking stress to ultimate stress

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dNone of these

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


aDi, opt = 3 Q0.36 ρ0.18

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bDi, opt = 3.9 Q0.45 ρ0.23

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cDi, opt = 7.6 Q0.36 ρ0.9

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dDi, opt = 3 Q0.36 ρ1.86 μ0.08

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


aRimmed still

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bMild steel

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cKilled steel

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dSemi-killed steel

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View Answer Rimmed still

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


aUltimate stress

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bYield stress

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cElastic limit

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dBreaking stress

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View Answer Elastic limit

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


aSmall diameter tanks

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bLarge diameter tanks

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cSmall diameter tall tanks

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dAll tanks irrespective of their heights and diameters

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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

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bWall thickness is > 30 mm

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

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dBoth B. & C.

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View Answer Both B. & C.

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


a0.08 to 0.12 d

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b0.02 to 0.05 d

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c0.2 to 0.5 d

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d0.5 to 0.6 d

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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

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

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cGuard against foaming & entrainment by dumping antifoaming agent through it

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dAll A., B. and C.

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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

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

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

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

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Back-trapping in a distillation column results due to_________________?


aLow gas velocity

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bHigh gas velocity

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cExcessive liquid gradient over the tray

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dLow reflux ratio

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