FUELS AND COMBUSTION QUIZ

Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?

None of these

Ammonium nitrate

Ammonium sulphate

Ammonium phosphate

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following gaseous fuels has the lowest calorific value?

Gobar gas

Blast furnace gas

Converter gas

Refinery gas

TRUE ANSWER : ?
YOUR ANSWER : ?

The cuprous chloride used in orsat apparatus can absorb

Both CO and O₂

Only CO

Both CO and CO₂

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.

Increases

May increase or decrease depending on the type of fuel

Decreases

Remains same

TRUE ANSWER : ?
YOUR ANSWER : ?

Desirable "Micum Index" values of metal-lurical coke are

M40 > 78% and M10 < 10%

M40 > 98% and M10 < 2%

M40 > 10% and M10 < 78%

M40 > 4% and M10 < 80%

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following would require least amount of secondary air for combustion?

Anthracite containing 10% volatile matter and 8% ash

Coke breeze containing 25% ash and 2% volatile matter

Semi-bituminous coal containing 25% ash and 20% volatile matter

Bituminous coal containing 20% ash and 25% volatile matter

TRUE ANSWER : ?
YOUR ANSWER : ?

Combustion of pulverised coal as compared to that of lump coal

Develops a non-luminous flame

Provides a lower rate of heat release

Can be done with less excess air

Develops a low temperature flame

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following would require maximum amount of % excess air for complete combustion?

Coke oven gas

Pulverised coal

Furnace oil

Lump coal (fixed on chain grate)

TRUE ANSWER : ?
YOUR ANSWER : ?

Ignition temperature decreases progressively from anthracite to lignite, because

Carbon content decreases

Volatile matter content increases

Moisture content increases

Ash content increases

TRUE ANSWER : ?
YOUR ANSWER : ?

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?

F. gas and coke oven gas

Sewage gas and gobar gas

Propane and acetylene

Propane and LPG

TRUE ANSWER : ?
YOUR ANSWER : ?