Chemical Engineering MCQs

Page No. 830

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


aImpact


bTorsion


cHardness


dCharpy


View Answer Hardness

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


aNickel, cobalt & chromium


bTungsten, chromium & cobalt


cManganese, chromium & cobalt


dTungsten, molybdenum & nickel



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


b10


c20


d35


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


bSaturated humidity


cVapor pressure


dAbsolute humidity


View Answer Aqueous tension

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


aVacancy


bDislocation


cGrain boundary


dAll of these


View Answer All of these

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


aAmmonium hydroxide


bSodium carbonate


cSodium hydroxide


dAmmonium carbonate


View Answer Sodium carbonate

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


aTemperature is low


bAtmospheric pressure is low


cAtmospheric pressure is high


dNone of these



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


aDescaling


bShot blasting


cPickling


dSkimming


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


bVery high which prevents their ignition by compression


cZero


dNone of these



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


aChimney


bInduced draught fan


cForced draught fan


dSteam jet arrangement


View Answer Steam jet arrangement

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