Chemical Engineering MCQs

Page No. 681

Pick out the wrong statement ?


aDDT is manufactured by the condensation of chlorobenzene with chloral at 30°C in presence of oleum, which is a highly exothermic reaction

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bChloral is obtained by the chlorination of ethyl alcohol

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cInsecticides acting on the insects through the respiratory system are called fumigants

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dBenzene hexachloride is not a contact insecticide

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Pick out the wrong statement?


aEosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action

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bSoap powder is prepared by mixing soap with hydrated sodium carbonate

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cDetergents differ from soaps in their action in hard water

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dTarnish inhibitor (e.g., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc

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With increase in temperature, the mutual solubility of two liquids_________________?


aIncreases

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bDecreases

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cRemains unchanged

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dDecreases exponentially

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View Answer Increases

H2S present in naphtha reformed gas is removed by absorbing with___________________?


aEthanolamine

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bK2CO3

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cHCl

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dVacuum gas oil

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View Answer Ethanolamine

Design calculation for multiple component distillation is done by_________________?


aPonchon-Savarit method

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bMcCabe-Thiele method

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cEnthalpy concentration method

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dTray to tray calculations

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Which of the following provides maximum contact surface for a liquid-vapour system ?


aPacked tower

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bBubble-cap plate column

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cSieve-plate column

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dWetted wall column

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View Answer Packed tower

Which is not concerned directly with mass transfer ?


aSchmidt number

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bSherwood number

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cLewis relationship

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dFroude number

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View Answer Froude number

Raoult’s law does not apply, when the___________________?


aSize of component molecules are not equal

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bAttractive forces between like and unlike molecules in the solution are approximately equal

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cComponent molecules are non-polar

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dChemical combination or molecular association between unlike molecules takes place in the formation of solution

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In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in_________________?


aReducing the axial mixing

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bIncreasing the rate of extraction

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cMaintaining the concentration difference between the two phases

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dAll A , B & C.

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View Answer All A , B & C.

pertaining to the analogy between equations of heat and mass transfer operations ? 0 Pick out the wrong statement


aSherwood number in mass transfer is analogous to Nusselt number in heat transfer

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bPrandtl number in heat transfer is analogous to Schmidt number in mass transfer

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cReynolds number in mass transfer is analogous to Grashoff number in heat transfer

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dReynolds number remains the same in both heat and mass transfer

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