Chemical Engineering MCQs

Page No. 834

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


aImmobility of dislocation

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bStrain-ageing

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cIncrease in Young’s modulus

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dStrain hardening

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View Answer Strain-ageing

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


aCopper

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bAluminium

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cNickel

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dZinc

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View Answer Nickel

Neutrons are present in all atoms except that of ___________________?


aHe

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bC

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cH

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dAr

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View Answer H

An atom bomb works on the principle of __________________?


aNuclear fission

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bNuclear fusion

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cBoth the nuclear fission & fusion

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dIonisation

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View Answer Nuclear fission

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


aDew point

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bDry bulb

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cWet bulb

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dNone of these

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View Answer Dew point

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


aSupercharging

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bWall temperature

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cCompression ratio

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dEngine speed

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View Answer Engine speed

Propulsion of rocket follows from the_________________?


aNewton’s second law of motion

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bNewton’s third law of motion

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cLaw of projectiles

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dArchimedes principle

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


aPainted steel

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bGalvanised iron

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cCase hardened steel

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dLead lined reactor

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View Answer Galvanised iron

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


aFlow output

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bHead developed

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cOverall efficiency

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dWeight

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View Answer Flow output

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


aWhite metal

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bGun metal

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cDuralumin

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dConstantan

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View Answer Constantan

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