FUELS AND COMBUSTION QUIZ

H₂

CH₄

N₂

CO₂

1-2

10-15

30-33

22-26

It reduces its flame temperature tremendously

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

It reduces its calorific value tremendously

There are chances of explosion during preheating

Dry gas/stack gas loss

Incomplete combustion

All of these

Moisture loss

Not at all

Negligibly

Fully

Partially

M = 1.8 A

M = 0.5 A

M = A

M = 1.1 A

Low production of CO₂

High production of CO

Both B and C

High production of CO₂

Free impurities

Inherent mineral matter

Ash

Volatile matter

Is non-coking

All of these

Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named

Has a high volatile matter content and burns with a luminous smoky flame

Combustion of fire slacks on the grates

Handling (e.g. when emptying wagons)

Its pulverisation (as it requires more power)

None of these