Chemical Engineering MCQs

Page No. 320

Which of the following would require least amount of secondary air for combustion ?


aCoke breeze containing 25% ash and 2% volatile matter


bAnthracite containing 10% volatile matter and 8% ash


cBituminous coal containing 20% ash and 25% volatile matter


dSemi-bituminous coal containing 25% ash and 20% volatile matter



Calorific value of blast furnace gas is around _____________ KCal/Nm3?


a850


b1800


c4200


d6500


View Answer 850

Nitrogen in coal_________________?


aIs present upto 1-2%


bComes from protein in parent vegetable matter


cIs recovered as ammonia during its carbonisation


dAll A., B. and C.


View Answer All A., B. and C.

The gas which contributes maximum to the heating value of natural gas is __________________?


aCO


bCO2


cH2


dCH4


View Answer CH4

To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in___________________?


aShallow and small piles


bFine sizes without the presence of any lump


cClosed space without any ventilation facility


dLarge heaps with small surface to volume ratio



Washing of coal decreases its_________________?


aCaking index


bMineral matter content


cAsh content


dBoth B. and C.



In flue gas analysis by Orsat’s apparatus, carbon monoxide is absorbed by__________________?


aCuprous chloride


bPotassium hydroxide


cAlkaline pyrogallol solution


dNone of these


View Answer Cuprous chloride

_____________ of the coal is the basis for Seylor’s coal classification?


aProximate analysis


bUltimate analysis


cCaking index


dCalorific value


View Answer Ultimate analysis

The shift conversion reaction taking place during water gas manufacture is given by__________________?


aC + H2O ↔ CO + H2


bC + 2H2O ↔ CO2 + 2H2


cCO + H2O ↔ CO2 + H2


dNone of these


View Answer CO + H2O ↔ CO2 + H2

Main component of sewage gas produced during anaerobic decomposition of organic waste (by suitable bacteria) during sewage disposal is __________________?


aH2


bCH4


cCO2


dN2


View Answer CH4

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