Chemical Engineering MCQs

Page No. 309

Which is the heaviest fuel gas out of the following ?


aBlast furnace gas

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bCoke oven gas

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cWater gas

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dCarburetted water gas

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View Answer Blast furnace gas

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


a1300

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b500

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c4500

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d9000

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View Answer 1300

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


aHigh amount/current of combustion air

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bLow amount/current of combustion air

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cPreheated secondary air

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dVery little excess air

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


aUse of thick fire bed

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bLow fusion point of ash (< 1100° C)

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cUse of preheated primary air

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dAll A., B. & C.

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View Answer All A., B. & C.

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


a4000

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b2500

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c6500

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d10000

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View Answer 6500

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


aCaking tendency

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bCoking tendency

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cClinkering tendency

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dSize stability

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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

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

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

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

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Higher fuel combustion efficiency cannot be achieved by_________________?


aPreheating of fuel gases & combustion air

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bReducing sulphur content in the fuel

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cAdopting proper fuel firing technique & fuel preparation

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dSupplying correct amount of combustion air

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


a50

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b1000

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c5000

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d5000

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View Answer 50

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


aH2

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bCH4

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cCO

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dNone of these

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View Answer CH4

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