Chemical Engineering MCQs

Page No. 497

A pressure vessel is said to be made of ‘thick’ shell, if the ratio of its diameter to wall thickness is_______________?


a< 10


b> 10


c> 20


d< 20


View Answer > 10

In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by________________?


a4(0.86P2 – πd2/4)/πd


b(P2 – πd2/4)/πd


c4(0.86P2 – πd2)/πd


d(4P2 + πd2/4)/πd



Speed of industrial paddle agitator ranges from _____________ rpm?


a1 to 5


b20 to 100


c500 to 750


d1000 to 2000


View Answer 20 to 100

_____________ dished head is the strongest of all?


aHemispherical


bElliptical


cTorispherical


dNone of these


View Answer Hemispherical

In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for______________?


aReducing scale deposition


bIncreasing pressure drop


cFixing the tubes


dCreating turbulence


View Answer Creating turbulence

The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally _____________ the tube wall thickness?


aEqual to


bTwice


cFour times


dHalf


View Answer Twice

LMTD correction factor is used in heat exchanger design for____________________?


aDouble pipe heat exchanger


bMultipass shell and tube heat exchanger


cFouling fluids


dCounter flow of hot and cold fluids



A binary liquid Azeotropic mixture has boiling point higher than either of the components, when it shows ______________ deviation from Raoult’s Law?


aPositive


bNegative


cNo


dNone of these


View Answer Negative

Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate ?


aTriangular pitch


bSquare pitch


cDiagonal square pitch


dHeat transfer rate is independent of tube arrangement


View Answer Triangular pitch

Cooling water fouling factors vary in the range of 0.001 to 0.003____________________?


a(BTU/hr.ft2. °F)-1


b(kcal/hr.m2.°C)-1


c(W/m2.°K)-1


d(kcal/hr. m. °C)-1


View Answer (BTU/hr.ft2. °F)-1

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