FUELS AND COMBUSTION QUIZ

The function of secondary combustion air is to

None of these

Burn the lumpy coal

Pneumatically convey the pulverised coal

Completely burn the volatile matter

TRUE ANSWER : ?
YOUR ANSWER : ?

For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will

Increase

Decrease

Not change

Increase or decrease depending on the fuel type

TRUE ANSWER : ?
YOUR ANSWER : ?

Coalification means the

Underground gasification of coal

Process of conversion of lignite into anthracite

Direct hydrogenation of coal

Complete combustion of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of nitrogen in combustion air does not reduce the

Any of the above

Amount of heat liberated

Flue gas temperature

Flame temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

900-1000

400-500

1700-1800

1400-1500

TRUE ANSWER : ?
YOUR ANSWER : ?

Oxygen percentage (by weight) in atmospheric air is

21

23

29

19

TRUE ANSWER : ?
YOUR ANSWER : ?

During coking of coal, the ash content (percentage)

Decreases

Increases

None of these

Remains constant

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following constituents of coal is the most important in the production of coke?

Moisture

Ash

Volatiles

Carbon

TRUE ANSWER : ?
YOUR ANSWER : ?

Coals used for the generation of producer gas should have

High caking index

Low fusion point of ash

Very low ash content (8-10%)

High volatile matter content

TRUE ANSWER : ?
YOUR ANSWER : ?

High sulphur (4-6%) coal in India are found in

Andhra Pradesh

Madhya Pradesh

Bengal

Assam

TRUE ANSWER : ?
YOUR ANSWER : ?

↑