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

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bMore

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cEqual

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dUnpredictable

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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

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bCreep strength

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cResilience

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dEndurance limit

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View Answer Endurance limit

Hot working of lead is carried out at ___________________?


a75°C

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b373°K

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c150°C

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dRoom temperature

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View Answer 373°K

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


a2-5

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b18-20

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c12-15

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d6-12

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View Answer 2-5

Fatigue resistance of a material is measured by the _____________________?


aElastic limit

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bUltimate tensile strength

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cYoung’s modulus

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dEndurance limit

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View Answer Endurance limit

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


aHalf

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bOne third

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cOne and half times

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dOne fourth

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View Answer One and half times

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


aIncreasing its cross-sectional area of flow

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bPassing it through a pressure reducing valve

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cForcing it downwards through a vertical tube

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dNone of these

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


aNitrogen oxides

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bHydrocarbons

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cBoth A. & B.

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dCarbon monoxide

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View Answer Both A. & B.

Dielectric___________________?


aIs an electrical insulating material

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bOf low resistivity is preferred

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cShould have high thermal conductivity

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dNeed not defy the corrosive action of chemicals

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Enzymes belong to the category of_____________________?


aProteins

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bCarbohydrates

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cVitamins

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dFats

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View Answer Proteins

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