Chemical Engineering MCQs

Page No. 427

Pick out the wrong statement?


aThe capacity of an evaporator is reduced by the boiling point elevation


bCorrosive liquid is normally passed through the tubes in a shell and tube heat exchanger


cSteam jet ejector is used for vapor compression in a thermal recompression evaporator


dHeat sensitive materials should be concentrated in high pressure evaporators



A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides __________________?


aHigher economy


bLower capacity


cBoth A. & B.


dLower economy


View Answer Higher economy

For evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is _________________?


aForward


bBackward


cParallel


dNone of these


View Answer Backward

1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m2 and the overall heat transfer co-efficient to the liquid is 1500 W/m2.°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be__________________?


a15 min


b22 min


c44 min


d51 min


View Answer 51 min

Heat waves_____________________?


aCannot pass through vacuum


bTravel in straight line


cCan be reflected by a mirror


dBoth B. and C.


View Answer Both B. and C.

If air (a non-condensing gas) is present in a condensing vapor stream, it will ______________ the condensation rate of vapor?


aIncrease


bDecrease


cNot affect


dIncrease the condensing film co-efficient as well as


View Answer Decrease

For a perfectly transparent surface (like gases), the____________________?


aAbsorptivity = 0


bTransmissivity = 1


cReflectivity = 0


dAll A., B. & C.


View Answer Transmissivity = 1

A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to_____________________?


ad0.8


bd-0.2


cd-1


dd-1.8


View Answer d-0.2

Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to_______________?


a4000


b> 10000


cNone of above


d2000


View Answer > 10000

The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?


aPeclet


bPrandtl


cStanton


dNusselt


View Answer Prandtl

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