Chemical Engineering MCQs

Page No. 310

A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that___________________?


a21% excess air has been used for combustion

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b21% excess oxygen has been used for combustion

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cComplete combustion of fuel has taken place

✓


dNo excess air has been used for combustion

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Percentage of methane in coke oven gas may be around _____________________?


a5

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b15

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c25

✓


d50

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View Answer 25

Gobar gas is produced by the _______________ of ‘gobar’ (cow dung) ?


aHydrolysis

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bFermentation

✓


cOxidation

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dDehydration

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View Answer Fermentation

Atomising steam to fuel oil ratio in a burner should be around__________________?


a0.5

✓


b1.5

✖


c2.5

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d3.5

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View Answer 0.5

The maximum adiabatic flame temperature is attained, when the fuel is burnt with ______________________?


aTheoretically required amount of air

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bMore than theoretically required amount of air

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cLess than theoretically required amount of air

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dTheoretically required amount of oxygen

✓



Volatile matter content in coking coal may be about _____________ percent?


a1

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b7

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c22

✓


d46

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View Answer 22

With increase in the temperature of carbonisation of coal ___________________?


aHydrogen content of coke oven gas increases due to cracking of hydrocarbons

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bMethane content in the coke oven gas decreases and carbon monoxide content increases

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cCalorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H2 content

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dAll A., B. and C.

✓


View Answer All A., B. and C.

The catalyst used in shift converter is _____________________?


aNickel

✓


bVanadium

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cSilica gel

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dAlumina

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View Answer Nickel

Calorific value of a typical dry anthracite coal may be around _____________ Kcal/kg?


a1000

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b4000

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c8000

✓


d15000

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View Answer 8000

Low temperature oxidation of coal during storage does not decrease its__________________?


aOxygen content

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bCaking power

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cCalorific value

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dNone of these

✓


View Answer None of these

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