Chemical Engineering MCQs

Page No. 26

Excessive use of chemical fertilisers causes shrivelling of the roots and wilting of the plant, because the__________________?


aOsmotic pressure of the soil water becomes less than that of the plant sap

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bSoil becomes too alkaline

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cOsmotic pressure of the soil water becomes higher than that of the plant sap

✓


dSoil becomes too acidic

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During conversion of ammonium carbamate into urea, presence of large excess of water______________?


a Increases the yield of urea

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b Adversely affects the yield of urea

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cReduces the evaporator load by diluting the urea solution

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dDoes not affect the yield of urea

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Coal based fertiliser plants at Ramagundam (Andhra Pradesh) and Talcher (Orissa) ?


aUse coal for heating purpose

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b Gasify coal to get hydrogen from coal gas

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c Use coal as filler in fertiliser

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d Use coal as conditioner in fertiliser

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Temperature and pressure in urea autoclave is_________________?


a120°C and 300 atm

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b190°C and 200 atm

✓


c400°C and 550 atm

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d200°C and 10 atm

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View Answer 190°C and 200 atm

_____________ is the undesirable by-product produced in the manufacture of urea ?


aAmmonium carbonate

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bBiuret

✓


cCarbon dioxide

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dAmmonium carbamate

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View Answer Biuret

A Potassic fertiliser contains 50% K2O. It could be _________________?


aPotassium sulphate

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b Potassium chloride

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cA mixture of NaCl + KCl

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dNone of these

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View Answer Potassium sulphate

Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in__________________?


a Low bulk density product

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bBiuret formation

✓


cNon-spherical prills

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dSubstantially wet non-flowing and sticky product

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View Answer Biuret formation

Which nutrient in fertiliser makes the plant stems stronger and increases branching ?


aNitrogen

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bPhosphorous

✓


cPotassium

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dCalcium

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View Answer Phosphorous

Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the ___________________?


aPresence of an inert atmosphere

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bPresence of a reducing atmosphere

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cAbsence of air

✓


d Presence of an oxidising atmosphere

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View Answer Absence of air

In natural gas, the C/H ratio (by weight) varies in the range of_________________?


a 3-4

✓


b 8-10

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c15-17

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d20-25

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View Answer 3-4

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