FUELS AND COMBUSTION QUIZ

Orsat apparatus is meant for

Finding out combustion efficiency

Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

Gravimetric analysis of flue gas

None of these

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Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?

70

85

100

50

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Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.

160

750

60

500

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Out of the following fuels, the difference between gross and net calorific value will be minimum in case of

Water gas

Natural gas

Coke oven gas

Blast furnace gas

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Low temperature oxidation of coal resulting from bad storage conditions does not decrease its

Calorific value

Oxygen content

Caking power

Hydrogen content

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The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always

> 1

1

Unpredicatable

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During its calorific value determination by bomb calorimeter, coal is combusted by

Oxygen enriched air

Air

Oxygen

None of these

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Nitrogen in coal

Is recovered as ammonia during its carbonisation

Comes from protein in parent vegetable matter

Is present upto 1-2%

All of these

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Blast furnace gas constitutes mainly of

N₂ & CH₄

N₂ & H₂

N₂ & CO

CH₄ & CO₂

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Which of the following has the highest flame speed?

C₂H₆

CH₄

CO

H₂

TRUE ANSWER : ?
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