Fuel and Combustion MCQs

Insecticides (e.g. moth balls)

Unsaturated polyesters

Drug intermediates e.g. β-naphthol

All of the above

Sensible

Latent

Sensible and latent

None of these

Requires larger combustion chamber than rich gaseous fuel

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 the above

Colour

Moisture content

Ash content

Volatile matter

Nitrogen

Air

Phenolic water

Carbon dioxide

Ammonia yield is more

Aliphatic tar is produced

Free carbon in tar is more

All of the above

Facilitates by-products recovery

Takes 2-3 days for coking of coal but requires no external fuel for heating

Gives larger yield of coke (around 85%) as compared to by-product ovens

Produces coke with very poor strength

Caking tendency

Coking tendency

Clinkering tendency

Size stability

Height of the coal heap should be < 3 metres

Maximum 200 tons should be stored in a heap

Both A and B

Neither A nor B

Coke oven gas

LPG

Blast furnace gas

Natural gas