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


bDecreases the outlet temperature of cooling medium


cIncreases the overall heat transfer coefficient


dNone of these



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


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


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


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


dAll A., B. and C.


View Answer All A., B. and C.

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


a1


b2


c3.5


d5.5


View Answer 2

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


a0.15-030


b0.5-0.65


c0.75-0.85


d0.60-0.90


View Answer 0.15-030

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


a1.5


b3


c5


d9


View Answer 3

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


aPoisson’s ratio


bBulk modulus


cModulus of elasticity


dShear modulus


View Answer Poisson’s ratio

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


a0


b


c> 1


d<1


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


b600


c1000


d1500


View Answer 600

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


aOverall plate efficiency


bMurphree plate efficiency


cPoint efficiency


dNone of these



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


a1.25


b1.75


c2.5


d3.5


View Answer 1.25

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