Chemical Engineering MCQs

Page No. 797

In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is ?


aLess


bMore


cEqual


dUnpredictable


View Answer Less

The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the________________?


aFatigue strength


bCreep strength


cResilience


dEndurance limit


View Answer Endurance limit

Hot working of lead is carried out at ___________________?


a75°C


b373°K


c150°C


dRoom temperature


View Answer 373°K

The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ?


a2-5


b18-20


c12-15


d6-12


View Answer 2-5

Fatigue resistance of a material is measured by the _____________________?


aElastic limit


bUltimate tensile strength


cYoung’s modulus


dEndurance limit


View Answer Endurance limit

Ultimate strength in tension as compared to that in shear for steel is____________________?


aHalf


bOne third


cOne and half times


dOne fourth


View Answer One and half times

Dry saturated steam can be converted into super heated steam by____________________?


aIncreasing its cross-sectional area of flow


bPassing it through a pressure reducing valve


cForcing it downwards through a vertical tube


dNone of these



Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ?


aNitrogen oxides


bHydrocarbons


cBoth A. & B.


dCarbon monoxide


View Answer Both A. & B.

Dielectric___________________?


aIs an electrical insulating material


bOf low resistivity is preferred


cShould have high thermal conductivity


dNeed not defy the corrosive action of chemicals



Enzymes belong to the category of_____________________?


aProteins


bCarbohydrates


cVitamins


dFats


View Answer Proteins

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