Chemical Engineering MCQs

Page No. 302

Ammonia content in raw coke oven gas is about _____________ gm/Nm3?


a1


b5


c50


d100


View Answer 5

Presence of ______________ in a dry gaseous fuel does not contribute to its calorific value?


aSulphur


bOxygen


cHydrogen


dCarbon


View Answer Oxygen

For maximum discharge through a chimney, its height should be___________________?


a200 meters


bInfinitely long


cMore than 105.7 metres


dEqual to the height of the hot gas column producing draught



Which of the following has the highest flame speed ?


aCO


bH2


cCH4


dC2H6


View Answer H2

Which of the following fuels is generally not used in thermal power plant boiler firing ?


aFurnace oil, light diesel oil and tar/PCM


bPulverised coking coal


cCoal middling from washeries


dB.F. gas, coke oven gas and L.D. converter gas



Use of excess of combustion air in the combustion of fuels results in__________________?


aHeat losses


bLong flame


cCondensation of water vapour from the fuel gas


dNone of these


View Answer Heat losses

Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the___________________?


aRequirement of large volume combustion chamber


bRisk of explosion


cChances of clinker formation


dIncomplete combustion of coal


View Answer Risk of explosion

Which of the following is called “blue gas”?


aCoke oven gas


bWater gas


cNatural gas


dProducer gas


View Answer Water gas

Rate of low temperature oxidation of coal due to bad storage conditions_______________?


aDecreases with increase in surface area


bDoes not vary with increase in surface area


cIs more for low volatile coal compared to high volatile coal


dIs accelerated by storage in large heaps with small surface to volume ratio



Dust content in raw blast furnace gas is about _______________ gm/Nm3; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use?


a15-30


b1-2


c70-100


d150-200


View Answer 15-30

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