FUELS AND COMBUSTION QUIZ

During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the

Complete combustion

High oxygen in flue gas

None of these

Incomplete combustion

TRUE ANSWER : ?
YOUR ANSWER : ?

Gobar gas is produced by the __________ of cown dung.

Fermentation

Oxidation

Hydrogenation

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Natural draught produced by a chimney depends upon the

Height of the chimney

Neither A nor B

Both A & B

Density of the chimney gases

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following would require least amount of secondary air for combustion?

Coke breeze containing 25% ash and 2% volatile matter

Bituminous coal containing 20% ash and 25% volatile matter

Anthracite containing 10% volatile matter and 8% ash

Semi-bituminous coal containing 25% ash and 20% volatile matter

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion

Increases

Decreases

Remains same

Either A or B, depends on other factors

TRUE ANSWER : ?
YOUR ANSWER : ?

Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of

Less air for combustion

Too much air for combustion

Pulverised coal in boilers

Correct amount of air for combustion

TRUE ANSWER : ?
YOUR ANSWER : ?

Catalyst used in Fischer-Tropsch process is

Zinc oxide

Thorium oxide

Nickel

Alumina

TRUE ANSWER : ?
YOUR ANSWER : ?

Higher percentage of ash in coal meant for the production of metallurgical grade coke

Decreases the abrasion resistance of coke

Decreases the hardness of coke

Causes brittleness in steel

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest flame speed?

CH₄

CO

H₂

C₂H₆

TRUE ANSWER : ?
YOUR ANSWER : ?

Washing of coal

Reduces its sulphur and ash content

Controls its ash fusibility and increases its calorific value

All of these

Improves its coking properties

TRUE ANSWER : ?
YOUR ANSWER : ?