Chemical Engineering MCQs

Page No. 834

Between 230 and 370°C, blue brittleness is caused in mild steel because of the_________________?


aImmobility of dislocation


bStrain-ageing


cIncrease in Young’s modulus


dStrain hardening


View Answer Strain-ageing

Principal alloying element in Elinvar (used for making hair springs for watches) is__________________?


aCopper


bAluminium


cNickel


dZinc


View Answer Nickel

Neutrons are present in all atoms except that of ___________________?


aHe


bC


cH


dAr


View Answer H

An atom bomb works on the principle of __________________?


aNuclear fission


bNuclear fusion


cBoth the nuclear fission & fusion


dIonisation


View Answer Nuclear fission

A psychrometer does not measure the __________________ temperature of moist air?


aDew point


bDry bulb


cWet bulb


dNone of these


View Answer Dew point

With increase in ___________________ Knocking tendency in a spark ignition petrol engine decreases?


aSupercharging


bWall temperature


cCompression ratio


dEngine speed


View Answer Engine speed

Propulsion of rocket follows from the_________________?


aNewton’s second law of motion


bNewton’s third law of motion


cLaw of projectiles


dArchimedes principle



Which of the following is an example of cathodic protection of metals against corrosion ?


aPainted steel


bGalvanised iron


cCase hardened steel


dLead lined reactor


View Answer Galvanised iron

The _________________ of a double acting reciprocating pump as compared to the single acting pump will be almost double ?


aFlow output


bHead developed


cOverall efficiency


dWeight


View Answer Flow output

Out of the following, the alloy which has equal percentage of constituents, is__________________?


aWhite metal


bGun metal


cDuralumin


dConstantan


View Answer Constantan

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