Chemical Engineering MCQs

Page No. 459

For hot feed, forward feeding as compared to backward feeding results in ______________ economy?


aIncreased


bDecreased


cNo effect on


dNone of these


View Answer Increased

In sub-cooled boiling ?


aTemperature of the heating surface is less than the boiling point of the liquid


bTemperature of the heating surface is more than the boiling point of the liquid


cBubbles from heating surface are absorbed by the mass of the liquid


dVery large vapour space is necessary



Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place____________________?


aBetween two bodies in physical contact with each other


bBetween two bodies not in physical contact with each other


cFrom one part of a body to the another part of the same body


dBoth B & C



The thickness of condensate layer in filmwise condensation depends on the__________________?


aCondensation rate


bSurface configuration


cLiquid flow rate from the surface


dAll A., B. and C.


View Answer All A., B. and C.

The heat transfer co-efficient in film type condensation is _______________ that for dropwise condensation?


aGreater than


bLower than


cIs same as


dHalf


View Answer Lower than

Steam economy in case of a triple effect evaporator will be _________________?


a1


b< 1


c> 1


dBetween 0 and 1


View Answer > 1

In a forward feed multiple effect evaporator unit__________________?


aViscosity of liquid is highest in first effect


bTransfer from effect to effect is done by pumps


cNo pump is required to withdraw the product from the last effect


dNone of these


View Answer None of these

Dropwise condensation is promoted on a/an ______________ surface?


aGlazed


bOily


cCoated


dSmooth


View Answer Oily

Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger ?


aCorrosiveness & fouling characteristics


bPressure


cViscosity


dDensity


View Answer Density

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?


a3.06 × 105


b6.12 × 105


c7.24 × 105


d9.08 × 105


View Answer 3.06 × 105

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