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

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

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

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

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


aNitrate

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bSulphate

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cCarbonate

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dChloride

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View Answer Nitrate

Joule-Thomson co-efficient is the ratio of________________?


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

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

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

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

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


aHand trolley

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bBelt conveyor

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cCrane

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dTruck

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View Answer Belt conveyor

Pick out the wrong statement ?


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

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

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cMost of the hydrocarbons are non-polar

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dNone of these

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View Answer None of these

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


aHardness

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bTensile

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cToughness

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dCompressive

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View Answer Hardness

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


aDecreases with the increase of concentration of the solute

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bIncreases with the increase of concentration of the solute

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cRemains constant

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dIs unity at infinite dilution

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View Answer Remains constant

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


aFloating hollow polypropylene spheres

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bSpraying alumina powder

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cPutting cement

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dNone of these

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


aΔ G° = 0 , Δ H° = 0

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bΔ H° = 0 , Δ S° = 0

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cΔ S° = 0 , Δ E° = 0

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dΔ S° = 0 , Δ Cp° = 0

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


aInternal energy

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bEnthalpy

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cEntropy

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dTemperature

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View Answer Entropy

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