Fuel and Combustion MCQs

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

M = 1.1A

M = A

M = 1.5A

M = 2A

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

It reduces its calorific value tremendously

It reduces its flame temperature tremendously

There are chances of explosion during preheating

Lurgi

Kopper-Totzek

Winkler

None of these

Low octane number

High cost & availability

Low flash point

Low calorific value

Benzol

Pitch-cresosote mixture (PCM)

Napthalene

Ethylene

CO

CO₂

H₂O

Both B & C

Controlling the excess air

Oxygen enrichment of combustion air

Using low c.v. fuels

Maintaining proper draft in the furnace

CO (upto 65%) & CO₂

CO₂ & H₂

CO & O₂

CO₂ & O₂

Aromatic compounds

Alphatic compounds

Paraffins

Olefins