Chemical Engineering MCQs

Page No. 628

For absorbers, high pressure drop results in___________________?


aIncreased efficiency


bDecreased efficiency


cHigh operating cost


dBetter gas liquid contact


View Answer High operating cost

The binary diffusivity in gases at atmospheric conditions is about ___________________?


a10-9 cm/sec


b10-1 cm2/sec


c10-3 sec/cm


d10-4 cm2/sec2


View Answer 10-1 cm2/sec

Occurrence of ‘case hardening’ during drying of a high moisture solid cake _______________ the drying rate?


aIncreases


bDecreases


cDoes not affect


dExponentially increases


View Answer Decreases

Refractory bricks are usually dried in a ________________ dryer?


aTray


bTunnel


cConveyor


dFestoon


View Answer Tunnel

The most common packing used in industrial operations is _______________ rings?


aRaschig


bLessing


cCross-partition


dSingle spiral


View Answer Raschig

Capacity of a rotary dryer depends on its __________________?


arpm


bInclination with ground surface


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Berl saddle made of carbon cannot be used for ___________________?


aAlkalis


bSO2


cH2SO4


dOxidising atmosphere


View Answer Oxidising atmosphere

For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of _______________ microns (1 mm = 1000 microns)?


a1-5


b10-60


c200-300


d> 500


View Answer 10-60

If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is___________________?


aL/G


bG/L


cAlways < 1


dNone of these


View Answer L/G

Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the _______________ number?


aSchmidt


bSherwood


cPeclet


dStanton


View Answer Schmidt

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