Chemical Engineering MCQs

Page No. 486

Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the__________________?


aPractical limit reached, due to low heat transfer rate because of inadequate temperature difference


bEconomic limit reached, when the plant cost exceeds the saving of steam


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?


a45


b60


c80


d95


View Answer 80

Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to___________________?


aG0.2


bG0.5


cG0.8


dG1.5


View Answer G0.8

Thickness of the frame of a plate and frame filter as compared to that of plates is___________________?


aLess


bSame


cMore


dEither A. or B.


View Answer More

Lap joints are preferred for plates having thickness _______________ mm?


a< 12.5


b> 3


c> 5


d5-10


View Answer > 3

Hazards associated with the relief valve leakage for extremely hazardous material storage can be taken care of by providing___________________?


aRupture diaphragm


bDikes


cSurge chamber


dNone of these


View Answer Rupture diaphragm

Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of _______________ type?


aNozzle or rim


bFlared out


cFluid in


dRing plate


View Answer Nozzle or rim

The wall thickness for a large high pressure pipeline is determined by the consideration of the____________________?


aAxial tensile stress in the pipe


bForces exerted by static and dynamic action at bends


cCircumferential pipe-wall tension


dTemperature stresses



The normal range of velocity of steam in pipes is _________________________ m/sec?


a0.1-0.5


b1-5


c10-20


d80-100


View Answer 80-100

Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than ______________ mm?


a10


b20


c30


d5


View Answer 30

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