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


bSoil becomes too alkaline


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


dSoil becomes too acidic



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


a Increases the yield of urea


b Adversely affects the yield of urea


cReduces the evaporator load by diluting the urea solution


dDoes not affect the yield of urea



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


aUse coal for heating purpose


b Gasify coal to get hydrogen from coal gas


c Use coal as filler in fertiliser


d Use coal as conditioner in fertiliser



Temperature and pressure in urea autoclave is_________________?


a120°C and 300 atm


b190°C and 200 atm


c400°C and 550 atm


d200°C and 10 atm


View Answer 190°C and 200 atm

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


aAmmonium carbonate


bBiuret


cCarbon dioxide


dAmmonium carbamate


View Answer Biuret

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


aPotassium sulphate


b Potassium chloride


cA mixture of NaCl + KCl


dNone of these


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


bBiuret formation


cNon-spherical prills


dSubstantially wet non-flowing and sticky product


View Answer Biuret formation

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


aNitrogen


bPhosphorous


cPotassium


dCalcium


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


bPresence of a reducing atmosphere


cAbsence of air


d Presence of an oxidising atmosphere


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


c15-17


d20-25


View Answer 3-4

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