Chemical Engineering MCQs

Page No. 312

A coal having higher volatile matter content, has lower_________________?


aSmoking tendency on burning


bCoke oven gas yield on carbonisation


cChance of catching fire during storage in open space


dIgnition temperature


View Answer Ignition temperature

Which of the following is unsuitable fuel for producer gas manufacture ?


aCoke


bAnthracite


cCoal having low fusion point of its ash


dCoal having high fusion point of its ash



Use of preheated air for combustion of fuel in the furnace, increases the___________________?


aScale losses of the furnace stock


bCalorific value of the fuel


cFlame temperature


dNone of these


View Answer Flame temperature

Which of the following is a poisonous fuel gas ?


aCoke oven gas


bBlast furnace gas


cNatural gas


dNone of these


View Answer Blast furnace gas

Blast furnace gas compared to coke oven gas has_________________?


aLower ignition temperature


bNarrower limit of inflammability


cHigher calorific value


dLower theoretical flame temperature



Which of the following has the highest calorific value (kcal/Nm3) ?


aCarburetted water gas


bGobar gas


cNatural gas


dLPG


View Answer LPG

The main function of primary air in pulverised coal fired burner is to_________________?


aBurn CO to CO2


bDry and transport the coal


cHave proper combustion by supplying it around the burner


dPreheat the tertiary air used for complete combustion of CO to CO2



Weathering of coal during storage causes_______________?


aReduction in coal size


bIncrease in its friability


cDecrease in its caking capacity


dAll A., B. and C.


View Answer All A., B. and C.

Number of macrocomponents present in coal according to Stopes are ___________________?


aFour


bFive


cSix


dTwo


View Answer Four

Which will have the least volatile matter and hence will be the most difficult to ignite ?


aBituminous coal


bCoke


cSemi-bituminous coal


dAnthracite


View Answer Coke

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