Chemical Engineering MCQs

Page No. 459

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


aIncreased

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bDecreased

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cNo effect on

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dNone of these

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View Answer Increased

In sub-cooled boiling ?


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

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

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

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dVery large vapour space is necessary

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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

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bBetween two bodies not in physical contact with each other

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

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dBoth B & C

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


aCondensation rate

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bSurface configuration

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cLiquid flow rate from the surface

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dAll A., B. and C.

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View Answer All A., B. and C.

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


aGreater than

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bLower than

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cIs same as

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dHalf

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View Answer Lower than

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


a1

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b< 1

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c> 1

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dBetween 0 and 1

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View Answer > 1

In a forward feed multiple effect evaporator unit__________________?


aViscosity of liquid is highest in first effect

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bTransfer from effect to effect is done by pumps

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

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dNone of these

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View Answer None of these

Dropwise condensation is promoted on a/an ______________ surface?


aGlazed

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bOily

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cCoated

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dSmooth

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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

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bPressure

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cViscosity

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dDensity

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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

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b6.12 × 105

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c7.24 × 105

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d9.08 × 105

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View Answer 3.06 × 105

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