FUELS AND COMBUSTION QUIZ

Fusion point of coal ash increases with increase in its __________ content.

Iron sulphate

All of these

Iron silicate

Lime and magnesia

TRUE ANSWER : ?
YOUR ANSWER : ?

Caking coal is desirable for

Burning on firebars

Coke making

All of these

Burning on travelling grate

TRUE ANSWER : ?
YOUR ANSWER : ?

Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of

MgO & Na₂CO₃

MgSO₄ & BaCl₂

BaSO₄ & NaCl

MgCO₃ & NaCl

TRUE ANSWER : ?
YOUR ANSWER : ?

Volumetric ratio of N₂ to O₂ in dry atmospheric air is

0.21

4.76

0.79

3.76

TRUE ANSWER : ?
YOUR ANSWER : ?

Oxygen percentage (by weight) in atmospheric air is

19

23

29

21

TRUE ANSWER : ?
YOUR ANSWER : ?

'Fuel' can be defined as a substance which produces heat by

All of these

Nuclear fusion

Nuclear fission

Combustion

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is used for making the explosive 'TNT'?

Pyridine

Toluene

Benzol

Cerosote

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

Decrease

Increase or decrease depending on the fuel type

Not change

Increase

TRUE ANSWER : ?
YOUR ANSWER : ?

Blast furnace gas compared to coke oven gas has

Narrower limit of inflammability

Lower ignition temperature

Lower theoretical flame temperature

Higher calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of nitrogen in combustion air does not reduce the

Flame temperature

Amount of heat liberated

Any of the above

Flue gas temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

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