Chemical Engineering MCQs

Page No. 781

Normalising of a casting does not__________________?


aInduce stresses in it


bRefine its grain structure


cReduce segregation


dImprove its mechanical properties


View Answer Induce stresses in it

_____________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C ?


aVeneering


bGalvanising


cElectroplating


dCalorising


View Answer Calorising

Percentage of argon (by volume) in dry atmospheric air is about________________?


a0.09


b0.3


c0.57


d0.94


View Answer 0.94

Air standard Otto cycle is more efficient than the diesel cycle for the same__________________?


aHeat addition & compression ratio


bHeat addition & pressure


cCompression ratio & pressure


dCylinder dimension & rpm



Hydrogen can be ________________?


aUsed in I.C. engines as fuel


bLiquefied & stored under cryogenic conditions


cProduced by electrolysis of water


dAll (A), B. & C.


View Answer All (A), B. & C.

Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________________ kJ ?


a+4000


b-4000


c10000


d-10000


View Answer +4000

Electrometallurgical methods of metal extraction is normally used for those metals___________________?


aWhose oxide/ore is not reduced by carbon


bWhich fall in the category of alkali & alkaline earth metals


cWhich stands higher in the electrochemical series of the metal


dAll A, B. & C.


View Answer All A, B. & C.

What is the percentage of chromium in 18-4-1 high speed steel ?


a1


b4


c18


d23


View Answer 18

Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250- 525°C, thereby changing austenite to___________________?


aSorbite


bBainite


cMartensite


dTroostite


View Answer Bainite

With decrease in the grain size of a material, its creep resistance___________________?


aIncreases


bDecreases


cRemain constant


dEither A. or B.; depends on the material


View Answer Remain constant

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