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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