Chemical Engineering MCQs

Page No. 487

Longitudinal stress induced in a thin walled cylindrical storage vessel is __________________?


apD/2t


bpD/4t


cpD/3t


dpD/6t


View Answer pD/4t

In the design of a bag filter, the gas temperature is an important consideration, as it affects the___________________?


aGas density


bGas viscosity


cFibre selection


dAll A., B. & C.


View Answer All A., B. & C.

With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the ______________________ decreases?


aFixed charges initially


bRunning cost of cooling water for condenser


cVapour & liquid load both


dRunning cost of steam for reboiler



In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed _______________________ of the column diameter?


a1/10-1/15th


b1/5-1/10th


c1/20-1/30th


d1/2 to 1/4th


View Answer 1/10-1/15th

In the design of a shell and tube heat exchanger, the corrosion allowance ____________________?


aNeed not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.


bFor carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm


cFor internal cover and tube sheet is provided on both the sides


dAll A., B. & C.


View Answer All A., B. & C.

____________________ strain is measured using a ‘strain rosetter’ ?


aVolumetric


bShear


cLinear


dNone of these


View Answer Linear

The minimum plate spacing in most of the petroleum refinery distillation columns (of dia > 3 ft) is normally _____________ inches?


a6


b12


c18


d36


View Answer 18

_______________ shaped roof is most commonly used for cylindrical tanks ?


aCone


bDome


cUmbrella


dFlat


View Answer Cone

(Le/D) for fully open gate valves would be __________________?


aMuch more than that for fully open globe valves


bMuch less (say 2% than that for fully open globe valves)


cAround 7


dBoth B. and C.


View Answer Both B. and C.

Smoker’s equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the_________________?


aRelative volatility is close to one (e.g., separation of close boiling isomers)


bFeed is not at its bubble point


cNumber of equilibrium stages in only stripping section is to be calculated


dNumber of equilibrium stages required is likely to be very small



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