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Higher amount of methane

Lower amount of hydrogen

Both A & B

Higher amount of both methane and hydrogen

Carburetted water gas is also called blue gas

Coals are divided in four species according to their carbon content in Seylor’s classification

Carbonisation time in a by-product coke oven is about 16 hours

Gross and net calorific value of a fuel is the same, if it does not contain hydrogen or hydrocarbons

Reduces the coking time

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

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

None of these

Lurgi

Kopper-Totzek

Winkler

None of these

CO

CO₂

H₂O

Both B & C

Aromatic compounds

Alphatic compounds

Paraffins

Olefins

Decreases

Increases

Remains same

May increase or decrease depending on the type of fuel

Caking

Pulverised

Non-caking

High ash

Lower bulk density

Lower strength

Higher reactivity

All of the above

Give less yield of tar and gas on carbonisation

Burn with a small non-smoky flame

Have a very high calorific value

None of these