Chemical Engineering MCQs

Page No. 309

Which is the heaviest fuel gas out of the following ?


aBlast furnace gas


bCoke oven gas


cWater gas


dCarburetted water gas


View Answer Blast furnace gas

The calorific value of producer gas is around _____________ kcal/Nm3?


a1300


b500


c4500


d9000


View Answer 1300

Short/intense flame is produced during combustion of gaseous fuel by using________________?


aHigh amount/current of combustion air


bLow amount/current of combustion air


cPreheated secondary air


dVery little excess air



During combustion of coal on grate, clinker formation is increased by the___________________?


aUse of thick fire bed


bLow fusion point of ash (< 1100° C)


cUse of preheated primary air


dAll A., B. & C.


View Answer All A., B. & C.

Calorific value of coke even gas produced by low temperature carbonisation of coal is about ____________ Kcal/Nm3?


a4000


b2500


c6500


d10000


View Answer 6500

Softening temperature of coal ash is a measure of the _____________ of coal?


aCaking tendency


bCoking tendency


cClinkering tendency


dSize stability


View Answer Clinkering tendency

A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is_________________?


aCO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60


bCO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02


cCO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06


dCO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74



Higher fuel combustion efficiency cannot be achieved by_________________?


aPreheating of fuel gases & combustion air


bReducing sulphur content in the fuel


cAdopting proper fuel firing technique & fuel preparation


dSupplying correct amount of combustion air



Tolerable concentration of toxic carbon monoxide in atmospheric air is about ______________ ppm?


a50


b1000


c5000


d5000


View Answer 50

Which of the following combustibles is absent in blast furnace gas ?


aH2


bCH4


cCO


dNone of these


View Answer CH4

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