Chemical Engineering MCQs

Page No. 481

Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele’s method, this method_________________?


ais more accurate in finding the number of equilibrium stages


baccounts for the enthalpy changes in the process


cFacilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method


dAll A, B. & C.


View Answer All A, B. & C.

The safe height (h) to diameter D. ratio (i.e., h/d) for liquid/petro fuel storage tank of capacity more than 45 kilolitres is less than _________________?


a1


b2


c3


d3.5


View Answer 1

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


a0


b


c> 1


d< 1


View Answer > 1

Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have ______________ roofs?


aConical


bFlat


cFloating


dFixed


View Answer Floating

A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator__________________?


aIs economical in operation


bEmploys high velocity, high heat transfer rate and less heating surface requirement


cEmploys a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle


dBoth B. & C.


View Answer Both B. & C.

An adequate clearance between the tray and the shell wall of a distillation column is provided to_____________________?


aDrain the liquid from the tray when the unit is not in operation


bAllow for thermal expansion and facilitate installation


cAvoid back-trapping


dNone of these



Safety valves are provided in chemical equipments to guard against excessive_________________?


aTemperature


bPressure/pressure fluctuation


cTurbulence


dNoise



Theoretically calculated diameter of the stripping section of the continuous rectification column is ______________ that of the enriching section?


aLess than


bMore than


cSame as


dEither more or less (depending upon relative volatility


View Answer More than

Floating head heat exchangers are used for the____________________?


aHeat transfer between corrosive fluids


bCases where temperature difference between the shell and the tubes is more (>50°C)


cCo-current heat transfer systems


dCounter-current heat transfer systems



Welded joint efficiency in the design of chemical process equipment is taken as_________________?


a0.55


b0.75


c0.85


d0.95


View Answer 0.85

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