Chemical Engineering MCQs

Page No. 830

_______________ test can be termed as the semi-destructive test?


aImpact

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bTorsion

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cHardness

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dCharpy

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View Answer Hardness

Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are____________________?


aNickel, cobalt & chromium

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bTungsten, chromium & cobalt

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cManganese, chromium & cobalt

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dTungsten, molybdenum & nickel

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Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?


a5

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b10

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c20

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d35

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View Answer 20

A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its_______________?


aAqueous tension

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bSaturated humidity

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cVapor pressure

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dAbsolute humidity

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View Answer Aqueous tension

With increase in annealing temperature, the following defect density decreases?


aVacancy

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bDislocation

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cGrain boundary

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dAll of these

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View Answer All of these

The leaching solvent used in Baeyer’s process for the purification of bauxite is___________________?


aAmmonium hydroxide

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bSodium carbonate

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cSodium hydroxide

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dAmmonium carbonate

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View Answer Sodium carbonate

Boiling point of water gets lowered at high altitudes (e.g., hills), because ___________________?


aTemperature is low

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bAtmospheric pressure is low

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cAtmospheric pressure is high

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dNone of these

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The process of removal of scale formed during hot rolling of steel is termed as_________________?


aDescaling

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bShot blasting

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cPickling

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dSkimming

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View Answer Pickling

Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is____________________?


aVery low which prevents their ignition by compression

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bVery high which prevents their ignition by compression

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cZero

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dNone of these

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Which of the following is used to produce draught in the locomotive boilers ?


aChimney

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bInduced draught fan

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cForced draught fan

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dSteam jet arrangement

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View Answer Steam jet arrangement

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