FUELS AND COMBUSTION QUIZ

Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.

1400

1100

1250

1350

TRUE ANSWER : ?
YOUR ANSWER : ?

Caking index of coal blend used for blast furnace coke making is about

22

8

12

36

TRUE ANSWER : ?
YOUR ANSWER : ?

Most of the coking coals are

Bituminous

None of these

Anthracite

Lignite

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Natural gas

Water gas

Producer gas

Blast furnace gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Coke having higher porosity has

All of these

Lower strength

Higher reactivity

Lower bulk density

TRUE ANSWER : ?
YOUR ANSWER : ?

Combustion of pulverised fuel

Requires larger combustion chamber than rich gaseous fuel

All of these

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

TRUE ANSWER : ?
YOUR ANSWER : ?

KOH solution used in orsat apparatus absorbs

SO₂

Neither A nor B

Both A & B

CO₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Benzene is used

As a motor fuel

For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)

As a perfume

As an explosive

TRUE ANSWER : ?
YOUR ANSWER : ?

Coal tar (produced by high temperature carbonisation) is the main source of

Olefins

Aromatic compounds

Alphatic compounds

Paraffins

TRUE ANSWER : ?
YOUR ANSWER : ?

Which will have the least volatile matter and hence will be the most difficult to ignite?

Bituminous coal

Coke

Aanthracite

Semi-bituminous coal

TRUE ANSWER : ?
YOUR ANSWER : ?