Chemical Engineering MCQs

Page No. 795

Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is___________________?


aNickel


bCobalt


cVanadium


dPlatinum


View Answer Platinum

Cascade control is___________________?


aThe continuous adjustment of the set point index of an automatic control loop by a primary(master) controller


bUsed when changes in process conditions cause serious upsets in the controlled variable


cUseful to control flow from temperature


dAll A, B & C


View Answer All A, B & C

For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = – 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be__________________?


a30,000 J


b60,000 J


c90,000 J


d2,40,000 J


View Answer 90,000 J

Strain hardening effect in metals subjected to cold working is due to the _______________ mechanism?


aSlip


bFracture


cWinning


dDislocation


View Answer Dislocation

Which of the following heat treatment processes is usually applied to castings ?


aTempering


bAnnealing


cNormalising


dCarburising


View Answer Carburising

A material is capable of resisting softening at high temperature, because of its property termed as____________________?


aHot temper


bHot hardness


cFatigue


dCreep


View Answer Hot hardness

When an isolated thermodynamic system executes a process ___________________?


aWork is done


bHeat transfer takes place


cMass flow occurs across the boundary of the system


dNo chemical reaction takes place within the system



The main constituent of bones is ______________________?


aCaF2


bCa3(PO4)2


cCaCO3


dCaCl2


View Answer Ca3(PO4)2

Which of the following alloying elements is present in maximum percentage in high speed steel ?


aMolybdenum


bChromium


cTungsten


dVanadium


View Answer Molybdenum

Baffles provided on the shell side of a shell and tube heat exchanger are meant for _____________________?


aProviding support for the tubes


bImproving heat transfer


cBoth A & B


dPreventing the fouling of tubes & stagnation of shell side fluid


View Answer Both A & B

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