FUELS AND COMBUSTION QUIZ

In general, the limit of inflammability/explosion limit of fuel gases is widened by the

Increase in temperature (i.e. preheating)

All of these

Use of pure oxygen for combustion instead of air

Increase in gas pressure

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In high temperature carbonisation of coal compared to low temperature carbonisation

H₂ content in the coke oven gas is more

Yield of ammonia is less

Aromatic content of tar is low

Calorific value of the coke oven gas is lower

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Which of the following is not a by-product fuel?

Blast furnace gas

Refinery gas

Pitch

Petrol

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Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called

None of these

Back draughting

Under pressurising

Banking

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Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

Ash disposal problem

Excessive fly-ash discharge from the stack

Erosion of induced draft fan blades

High power consumption in its transportation

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Which of the following fuel gases has the highest calorific value ?

Natural gas

Coal bed methane (CBM)

Liquefied petroleum gas (LPG)

Sewage gas

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With increase in the oxygen content of the coal, its __________ decreases.

Caking power

Both A & B

Neither A nor B

Calorific value

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A coal containing high amount of volatile matter will have

Low adiabatic flame temperature

Very little ash content

Low ignition temperature

High fusion point of its ash

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While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at

Raniganj

Dhanbad

Singreni (AP.)

Dankuni (West Bengal)

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

Blast furnace gas

Carburetted water gas

Producers

Natural gas

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