Chemical Engineering MCQs

Page No. 279

Prime coking coal is always blended with medium or non- coking coal before carbonisation__________________?


aTo check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls


bBecause, it alone produces unreactive coke


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Low temperature carbonisation of coal takes place at ______________ °C?


a300


b1100


c700


d150


View Answer 700

With increase in calorific value of fuels, their adiabatic flame temperatures__________________?


aIncrease


bDecrease


cRemain unchanged


dMay increase or decrease; depends on the quantity of products of combustion



Which of the following is not applicable to fluidised bed combustion of coal ?


aIt cannot burn low grade coal


bIt achieves higher fuel combustion efficiency


cLess heat transfer surface area is required in boilers


dNone of these



Efficiency of the combustion of a fuel is judged by the ______________ the flue gas?


a% of CO2 in


b% of O2in


cTemperature of


dColour of


View Answer % of O2in

Preheating of a gaseous fuel results in increased____________________?


aFlame length


bFlame temperature


cQuantity of flue gas


dIgnition temperature


View Answer Flame temperature

Mineral matter content (M) and ash content A. in coal are approximately related as _______________?


aM = 1.1A


bM = A


cM = 1.5A


dM = 2A


View Answer M = 1.1A

Which of the following gaseous fuels is likely to have the highest gross calorific value ?


aSewage gas


bLPG


cProducer gas


dNatural gas


View Answer LPG

Coke oven gas compared to blast furnace gas is________________?


aMore explosive and inflammable


bLess poisonous


cLighter


dAll A., B. and C.


View Answer All A., B. and C.

Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction ?


a2CO ↔ C + CO2


bCO + H2O ↔ CO2 + H2


cC + H2O ↔ CO + H2


dC + 2H2O ↔ CO2 + 2H2


View Answer 2CO ↔ C + CO2

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