FUELS AND COMBUSTION QUIZ

Less than theoretically required amount of air

More than theoretically required amount of air

Theoretically required amount of air

Theoretically required amount of oxygen

Give less yield of tar and gas on carbonisation

Burn with a small non-smoky flame

None of these

Have a very high calorific value

Either A or B

Either A or C without gain or loss of heat

Oxygen

Air

Sewage gas

Natural gas

Liquefied petroleum gas (LPG)

Coal bed methane (CBM)

Facilitate easy discharging of coke as it swells during carbonisation

None of these

Facilitate uniform heating of the oven

Increase the output of the coke

Complete combustion

Incomplete combustion

High oxygen in flue gas

None of these

750

1100

500

950

Evolution of H₂ and formation of methane and aromatics occur at > 700°C

Hard semi-coke starts shrinking at 600°C

All of these

All tar is evolved at < 600°C

Bituminous

Semi-anthracite

Sub-bituminous

Lignite

Damper

All of these

Speed of the fan

Variation in the pitch of the fan blades