Chemical Engineering MCQs

Page No. 305

Which of the following has the highest flame velocity ?


aH2


bCO


cCH4


dC2H6


View Answer H2

Which of the following has the highest theoretical flame temperature ?


aBlast furnace gas


bHydrogen


cAcetylene


dCoke oven gas


View Answer Acetylene

Which of the following will generate maximum volume of product of complete combustion (Nm3/Nm3 of fuel) ?


aCarburetted water gas


bBlast furnace gas


cNatural gas


dProducers’ gas


View Answer Natural gas

C/H ratio is the minimum in case of_________________?


aFurnace oil


bNatural gas


cCoal


dNaphtha


View Answer Natural gas

The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorific value will be___________________?


ay


b0.95 y


c1.05 y


d1.8 y


View Answer y

The gasification reaction represented by, C + H2O = CO + H2, is__________________?


aExothermic


bEndothermic


cCatalytic


dAutocatalytic


View Answer Endothermic

Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around ______________ Nm3?


a30


b300


c3,000


d30,000


View Answer 300

For long flame and easy ignition, the coal used should have_________________?


aHigh volatile matter


bLow ash


cHigh calorific value


dHigh ash


View Answer High volatile matter

Coke oven gas is stripped of its H2S and mercaptans content by_________________?


aAbsorption in wash oil


bAdsorption on bog iron bed


cBubbling it through dilute sulphuric acid


dAdsorption on silica gel



Presence of nitrogen in combustion air does not reduce the ____________________?


aAmount of heat liberated


bFlame temperature


cFlue gas temperature


dAny of the above



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