FUELS AND COMBUSTION QUIZ

As moisture proof coating on fibres

As a fuel in furnaces

As moth balls (insecticides)

For making electrodes

None of these

Reduces the coking time

Increases the loss of fine coal dust from the ovens when charging

Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls

Briquettes

Wood

Oil gas

Pitch creosote mixture

Decreases its calorific value

Does not alter its calorific value

Increases its calorific value

Is not possible on commerical scale

None of these

Higher methane content and thus higher calorific value

Higher carbon monoxide content

Lower carbon dioxide content

Low ignition temperature

High fusion point of its ash

Very little ash content

Low adiabatic flame temperature

Incomplete combustion

Complete combustion

None of these

High oxygen in flue gas

Solid

Both B and C

Liquid

Gaseous

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel

Suppresses the discharge of fine dust and grit into atmosphere

All of these

Requires larger combustion chamber than rich gaseous fuel

CO

CO₂

H₂O

CH₄