Chemical Engineering MCQs

Page No. 774

Steels with high carbon equivalent have poor Weldability, because in these steels during welding________________?


aCarbon and other alloying elements get oxidised from the weld pool


bExcessive ferrite forms in the heat affected zone leading to poor toughness of the weld


cMartensite forms in the heat affected zone leading to poor toughness/ductility of the weld


dSegregation of carbon and other element occurs in the weld pool leading to poor properties of the weld



Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium_______________?


aNitrate


bSulphate


cCarbonate


dChloride


View Answer Nitrate

Joule-Thomson co-efficient is the ratio of________________?


aPressure change to temperature change occuring during adiabatic compression of a gas


bPressure change to temperature change occuring during adiabatic throttling of a gas


cTemperature change to pressure change occuring during adiabatic compression of a gas


dTemperature change to pressure change occuring during adiabatic throttling of a gas



Which of the following material handling equipments is not suitable for moving materials in varying paths ?


aHand trolley


bBelt conveyor


cCrane


dTruck


View Answer Belt conveyor

Pick out the wrong statement ?


aMolecules with symmetrical arrangements (e.g. CH4 or CCl4) are non-polar


bGenerally, non-polar compounds are chemically inactive, conduct electricity poorly and do not ionise


cMost of the hydrocarbons are non-polar


dNone of these


View Answer None of these

_________________ property of a material is determined by the Herbert Pendulum device?


aHardness


bTensile


cToughness


dCompressive


View Answer Hardness

The activity co-efficient of the solute in a dilute solution ?


aDecreases with the increase of concentration of the solute


bIncreases with the increase of concentration of the solute


cRemains constant


dIs unity at infinite dilution


View Answer Remains constant

Insulation of liquid surface can be achieved by _____________ on top of its surface?


aFloating hollow polypropylene spheres


bSpraying alumina powder


cPutting cement


dNone of these



At absolute zero temperature, for any reaction involving condensed phases ?


aΔ G° = 0 , Δ H° = 0


bΔ H° = 0 , Δ S° = 0


cΔ S° = 0 , Δ E° = 0


dΔ S° = 0 , Δ Cp° = 0



If a solid is compressed adiabatically in its elastic range, its _____________ remains constant ?


aInternal energy


bEnthalpy


cEntropy


dTemperature


View Answer Entropy

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