FUELS AND COMBUSTION QUIZ

With increase in the oxygen content of the coal, its __________ decreases.

Both A & B

Neither A nor B

Caking power

Calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

Orsat apparatus

Can

Gives flue gas analysis on dry basis

Determines N₂ in flue gas indirectly

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of phosphorous in metallurgical coal

Is not undersirable

Badly affects the quality of steel

Reduces its calorific value

Increases its caking power

TRUE ANSWER : ?
YOUR ANSWER : ?

Caking index of the coal blend used for the manufacture of metallurgical coke should be around

48

21

40

5

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Decreases

Remains same

Increases

Either A or B, depends on other factors

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ present in coal is not determined in its ultimate analysis.

Total carbon

Fixed carbon

Nitrogen

Hydrogen

TRUE ANSWER : ?
YOUR ANSWER : ?

The main function of primary air in pulverised coal fired burner is to

Burn CO to CO₂

Preheat the tertiary air used for complete combustion of CO to CO₂

Have proper combustion by supplying it around the burner

Dry and transport the coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Higher fuel combustion efficiency can not be achieved by

Adopting proper fuel firing technique & fuel preparation

Preheating of fuel gases & combustion air

Reducing sulphur content in the fuel

Supplying correct amount of combustion air

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following fuels is the best for burning on chain grate stoker?

Coking coal

Pulverised coal

Caking coal

Non-caking coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a product of tar distillation?

Phenol & naphthalene

Benzol & pitch

Anthracene & creosote

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?