Chemical Engineering MCQs

Page No. 500

Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to _____________________?


a5 cms

✓


b40% of the I.D. of the shell

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c25 cms

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dI.D. of the shell

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View Answer 5 cms

Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling ?


aCO2

✖


bSO2

✖


cNH3

✓


dNone of these

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View Answer NH3

Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height?


a4-8

✖


b17-34

✓


c52-68

✖


d88-105

✖


View Answer 17-34

The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is___________________?


a0

✖


b∞

✓


c1

✖


dMinimum

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View Answer ∞

For turbine agitator, the impeller diameter is about_________________?


a0.3 to 0.5 d

✓


b0.1 to 0.2 d

✖


c0.65 to 0.85 d

✖


d0.95 d

✖


View Answer 0.3 to 0.5 d

The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the_________________?


aEqual sized reactors are the best

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bSmaller reactor should come first

✓


cLarger reactor should come first

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dNone of these

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Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is _____________ the longitudinal stress?


aHalf

✖


bEqual to

✖


cTwice

✓


dEight times

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View Answer Twice

The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations?


a0.3 to 0.8

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b1.25 to 3.125

✓


c3.5 to 7.0

✖


d8 to12

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View Answer 1.25 to 3.125

The ratio of down take area to cross-sectional area of the tube, for calandria type evaporator ranges from_________________?


a0.5 to 1

✓


b1 to 1.5

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c1.5 to 2

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d2 to 2.5

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View Answer 0.5 to 1

A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________________?


a5 mm

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b6 mm

✖


c8 mm

✖


d10 mm

✓


View Answer 10 mm

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