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

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bBecause, it alone produces unreactive coke

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

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


a300

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b1100

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c700

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d150

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View Answer 700

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


aIncrease

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bDecrease

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cRemain unchanged

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

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


aIt cannot burn low grade coal

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bIt achieves higher fuel combustion efficiency

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cLess heat transfer surface area is required in boilers

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dNone of these

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


a% of CO2 in

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b% of O2in

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cTemperature of

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dColour of

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View Answer % of O2in

Preheating of a gaseous fuel results in increased____________________?


aFlame length

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bFlame temperature

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cQuantity of flue gas

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dIgnition temperature

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View Answer Flame temperature

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


aM = 1.1A

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bM = A

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cM = 1.5A

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dM = 2A

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View Answer M = 1.1A

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


aSewage gas

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bLPG

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cProducer gas

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dNatural gas

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View Answer LPG

Coke oven gas compared to blast furnace gas is________________?


aMore explosive and inflammable

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bLess poisonous

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cLighter

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dAll A., B. and C.

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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

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bCO + H2O ↔ CO2 + H2

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cC + H2O ↔ CO + H2

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dC + 2H2O ↔ CO2 + 2H2

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View Answer 2CO ↔ C + CO2

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