Chemical Engineering MCQs

Page No. 297

Pick out the wrong statement ?


aPolymeric fibres are never produced by addition polymerisation

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bProperty of tackiness is exhibited by uncured rubber

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cSharp melting point is not observed in thermoplastic polymers

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dPolythene generally has an excellent resistance to ultra violet rays

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Pick out the wrong statement ?


aLinear polymers are formed from bifunctional groups only and are normally thermoplastic

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bCross-linked branched chain polymers are either elastometric or thermosetting

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cBranching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point

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dDibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

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Pick out the wrong statement ?


aCold SBR is superior as compared to hot SBR

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bPolymerisation temperature can modify the properties of SBR

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cProduction of cold SBR employs lower pressure as compared to that of hot SBR

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dNone of these

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View Answer None of these

‘Wobbe index’ is a characteristic of__________________?


aSolid fuels

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bGaseous fuels

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cLiquid fuels

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dFat coals

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View Answer Gaseous fuels

Spontaneous combustion of coal on storage results due to___________________?


aInadequate ventilation

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bLow temperature oxidation

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cStorage in large heaps with small surface to volume ratio

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dAll A., B. and C.

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View Answer All A., B. and C.

White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_________________?


aTar

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bCoke oven gas

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cPitch

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dPulverised coke

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View Answer Coke oven gas

As the equilibrium moisture content of the coal increases, its___________________?


aCalorific value increases

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bSwelling number decreases

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cSwelling number increases

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dBulk density decreases

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Which of the following is not used as a binder in coal briquetting ?


aTar

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bMolasses

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cPitch

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dLine

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View Answer Line

Which of the following fuel gases has the highest calorific value ?


aNatural gas

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bCoal bed methane (CBM)

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cLiquefied petroleum gas (LPG)

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dSewage gas

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In Orsat’s apparatus, ammoniacal cuprous chloride is used for selectivity absorbing________________?


aCO

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bCO2

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cO2

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dH2O

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View Answer CO

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