Chemical Engineering MCQs

Page No. 461

In Biot number, the characteristic length used is the ratio of the _______________ of the solid?


aVolume to surface area

✓


bPerimeter to surface area

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cSurface area to volume

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dSurface area to perimeter

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Boiling point elevation for a strong and concentrated solution is found by Duhring’s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the _______________ of pure water?


aBoiling point

✓


bDynamic viscosity

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cKinematic viscosity

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dDensity

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View Answer Boiling point

Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K) ?


at4

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bT4

✓


c1/t4

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d1/T4

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View Answer T4

The equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?


aColburn

✓


bReynolds

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cPrandtl

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dNone of these

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View Answer Colburn

The range of electromagnetic spectrum important in heat transfer by radiation is ______________ microns?


a0.38-0.78

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b0.5-50

✓


c100-1000

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d5-50

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View Answer 0.5-50

Boiling point of a solution according to Duhring’s rule is a linear function of the _____________ of water?


aBoiling point (at the same pressure)

✓


bViscosity

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cDensity

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dThermal conductivity

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Prandtl number for most of dry gases is about________________?


a0.001

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b0.72

✓


c70

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d150

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View Answer 0.72

Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the________________?


aLess corrosion problems

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bFlexibility possible in the baffle arrangement

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cLow pressure drop

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dHigh heat transfer co-efficient

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The purpose of providing expansion bellows in the shell of tubular exchanger is to _____________________?


aIncrease the heating load

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bImpart structural strength

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cAccount for the uneven expansion of shell and tube bundles

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dFacilitate increase of shell length, if needed

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Multipass heat exchangers are used______________________?


aBecause of simplicity of fabrication

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bFor low heat load

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cTo obtain higher heat transfer co-efficient and shorter tube

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dTo reduce the pressure drop

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