Chemical Engineering MCQs

Page No. 475

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?


aDecreases the pressure drop

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bDecreases the outlet temperature of cooling medium

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cIncreases the overall heat transfer coefficient

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dNone of these

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Weep holes provided in the plates of a distillation column ____________________?


aFacilitate draining out liquid from a tray when the unit is not in operation

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bAre normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid

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c Must be large enough (usually 1/4″ to 5/8″ dia) to prevent plugging but should not deliver excessive amount of fluid during operation

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dAll A., B. and C.

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View Answer All A., B. and C.

Tube height in a calandria type evaporator is normally less than _______________ metres?


a1

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b2

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c3.5

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d5.5

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View Answer 2

The ratio, (propeller agitator dia/tank dia) is normally taken as____________________?


a0.15-030

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b0.5-0.65

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c0.75-0.85

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d0.60-0.90

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View Answer 0.15-030

Normal screwed fittings are used for pipes upto a diameter of _______________ inches?


a1.5

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b3

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c5

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d9

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View Answer 3

The ratio of lateral strain to linear strain is termed as the___________________?


aPoisson’s ratio

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bBulk modulus

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cModulus of elasticity

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dShear modulus

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View Answer Poisson’s ratio

What is the slope of the operating line in the rectifying section of a distillation column ?


a0

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b∞

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c> 1

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d<1

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View Answer <1

Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscosity above ____________________ poise?


a300

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b600

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c1000

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d1500

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View Answer 600

Which of the following efficiencies can be greater than 100% ?


aOverall plate efficiency

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bMurphree plate efficiency

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cPoint efficiency

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dNone of these

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Minimum tube pitch recommended for shell and tube heat exchangers is about _______________ times the outside diameter of the tube?


a1.25

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b1.75

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c2.5

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d3.5

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View Answer 1.25

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