FUELS AND COMBUSTION QUIZ

Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel) ?

Carburetted water gas

Producers

Natural gas

Blast furnace gas

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Low temperature carbonisation

Produces higher quantity of gas than high temperature carbonisation

Is meant for the production of 'metallurgical coke'

Produces less quantity of tar than high temperature carbonisation

Is mainly for producing the smokeless domestic coke

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The difference between total carbon and fixed carbon of coal will be minimum in case of

Lignite

Anthracite

Bituminous coal

High temperature coke (V.M < 0.5%)

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Calorific value as determined by bomb calorimeter is the

Higher calorific value at constant volume

Lower calorific value at constant pressure

Gross calorific value at constant pressure

Net calorific value at constant volume

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The internal energy of the combustion products is __________ compared to that of reactants.

Less

More or less ; (depends on the state of fuel.)

More

Equal

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With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.

Unsaturated hydrocarbons

All of these

Methane

Hydrogen

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KOH solution used in orsat apparatus absorbs

CO₂

SO₂

Neither A nor B

Both A & B

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Naphthalene is used for making

Drug intermediates e.g. β-naphthol

Insecticides (e.g. moth balls)

Unsaturated polyesters

All of these

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Higher percentage of ash in coal meant for the production of metallurgical grade coke

Decreases the hardness of coke

Causes brittleness in steel

None of these

Decreases the abrasion resistance of coke

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Percentage of hydrogen in coke oven gas may be around

25

45

60

10

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