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

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bCobalt

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cVanadium

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dPlatinum

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View Answer Platinum

Cascade control is___________________?


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

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

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cUseful to control flow from temperature

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dAll A, B & C

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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

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b60,000 J

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c90,000 J

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d2,40,000 J

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View Answer 90,000 J

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


aSlip

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bFracture

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cWinning

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dDislocation

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View Answer Dislocation

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


aTempering

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bAnnealing

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cNormalising

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dCarburising

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View Answer Carburising

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


aHot temper

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bHot hardness

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cFatigue

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dCreep

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View Answer Hot hardness

When an isolated thermodynamic system executes a process ___________________?


aWork is done

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bHeat transfer takes place

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cMass flow occurs across the boundary of the system

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dNo chemical reaction takes place within the system

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The main constituent of bones is ______________________?


aCaF2

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bCa3(PO4)2

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cCaCO3

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dCaCl2

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View Answer Ca3(PO4)2

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


aMolybdenum

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bChromium

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cTungsten

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dVanadium

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View Answer Molybdenum

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


aProviding support for the tubes

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bImproving heat transfer

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cBoth A & B

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dPreventing the fouling of tubes & stagnation of shell side fluid

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View Answer Both A & B

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