FUELS AND COMBUSTION QUIZ

Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ?

Blast furnace gas

Producer gas

Water gas

Natural gas

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal containing very high percentage of durain is called __________ coal.

Splint

Non-banded

Bright

Boghead

TRUE ANSWER : ?
YOUR ANSWER : ?

Largest constituent of blast furnace gas is

CO

H₂

CO₂

N₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Shatter index of the coke is a measure of its

Reactivity

None of these

Strength

Bulk density

TRUE ANSWER : ?
YOUR ANSWER : ?

High sulphur content in a fuel __________ of the flue gases.

Increases the dew point

Both B & C

Reduces the combustion efficiency by limiting the permissible temperature reduction

Decreases the dew point

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of phosphorous in metallurgical coal

Is not undersirable

Badly affects the quality of steel

Increases its caking power

Reduces its calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

Coalification means the

Direct hydrogenation of coal

Complete combustion of coal

Process of conversion of lignite into anthracite

Underground gasification of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

40

4

96

20

TRUE ANSWER : ?
YOUR ANSWER : ?

Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.

12

24

18

6

TRUE ANSWER : ?
YOUR ANSWER : ?

Spontaneous combustion of coal on storage results due to

All of these

Inadequate ventilation

Low temperature oxidation

Storage in large heaps with small surface to volume ratio

TRUE ANSWER : ?
YOUR ANSWER : ?

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