Chemical Engineering MCQs

Page No. 485

________________ liquor is best handled in a long tube vertical evaporator ?


aFoamy


bScaling


cViscous


dSalting


View Answer Foamy

In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube ?


aLong tube vertical evaporator


bShort tube vertical evaporator


cHorizontal tube evaporator


dNone of these



Pressure drop due to pipe fittings can be estimated by the equation, ΔP/ρ = 4f, (Le/D) (V2/2gc) where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (Le/D) (dimensionless) for 45° elbow and 180° close return bends would be respectively around______________________?


a5 and 10


b45 and 75


c180 and 300


d300 and 500


View Answer 45 and 75

In a distillation column, the minimum residence time for liquid in the downspout is about ______________ seconds?


a1


b8


c80


d180


View Answer 8

A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the__________________?


aCentral dished section and corner torus section


bCorner torus section and central dished section


cCentral dished section and straight flange section


dStraight flange section and corner torus section



______________ of water makes it a widely used coolant in heat exchangers?


aLow corrosiveness


bLow dirt factor


cHigh specific heat


dLow viscosity


View Answer High specific heat

Hold up of material in a operating rotary drier is in the range of___________________?


a0.05 to 0.15


b0.25 to 0.50


c0.5 to 0.8


d0.8 to 0.9


View Answer 0.05 to 0.15

Generally, elliptical dished heads____________________?


aAre manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m2


bResist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter


cAre approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D


dAll A., B. and C.


View Answer All A., B. and C.

For given number of passes, pitch & tube diameter, the maximum number of tubes that can be accommodated in a shell of tripled inside diameter will be ____________ times?


aAbout 9


bConsiderably more than 9


cConsiderably less than 9


dAbout 3



The retention time of material in a rotary dryer depends upon its ______________________?


arpm


bSlope & length


cFlights arrangement


dAll A., B. and C.


View Answer All A., B. and C.

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