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

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b> 10

✓


c> 20

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d< 20

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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

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d(4P2 + πd2/4)/πd

✖



Speed of industrial paddle agitator ranges from _____________ rpm?


a1 to 5

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b20 to 100

✓


c500 to 750

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d1000 to 2000

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View Answer 20 to 100

_____________ dished head is the strongest of all?


aHemispherical

✓


bElliptical

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cTorispherical

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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

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bIncreasing pressure drop

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cFixing the tubes

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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

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bTwice

✓


cFour times

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dHalf

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View Answer Twice

LMTD correction factor is used in heat exchanger design for____________________?


aDouble pipe heat exchanger

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bMultipass shell and tube heat exchanger

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cFouling fluids

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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

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bNegative

✓


cNo

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dNone of these

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View Answer Negative

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


aTriangular pitch

✓


bSquare pitch

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cDiagonal square pitch

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dHeat transfer rate is independent of tube arrangement

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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

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c(W/m2.°K)-1

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d(kcal/hr. m. °C)-1

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View Answer (BTU/hr.ft2. °F)-1

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