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

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dAdsorption on silica gel

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


aAmount of heat liberated

✓


bFlame temperature

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cFlue gas temperature

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dAny of the above

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