FUELS AND COMBUSTION QUIZ

Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the

Coke oven battery heating

Steel ladle drying

Mixing with blast furnace gas

Hot scarfing of steel slabs

TRUE ANSWER : ?
YOUR ANSWER : ?

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

5

21

48

40

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?

Pitch-cresosote mixture (PCM)

Ethylene

Benzol

Napthalene

TRUE ANSWER : ?
YOUR ANSWER : ?

Too much of excess air in combustion results in high

Stack gas temperature

All of these

Fuel consumption for the same heat load

Percentage of oxygen in flue gases

TRUE ANSWER : ?
YOUR ANSWER : ?

Gross and net calorific value of a fuel will be the same

Under no circumstances

If its ash content is zero

Ifits carbon content is very low

If its hydrogen/hydrogen compound content is zero

TRUE ANSWER : ?
YOUR ANSWER : ?

Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

Temperature of

% of O₂in

Colour of

%of CO₂ in

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following oil gasification processes is non-catalytic?

Steam reforming of naphtha

Semet-Solvay process

Onia-Gegi process

Segas process

TRUE ANSWER : ?
YOUR ANSWER : ?

Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher

Higher C/H ratio

Difference in gross & net calorific value

Calorific value

Sulphur content

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest calorific value (kcal/Nm³) ?

LPG

Gobar gas

Natural gas

Carburetted water gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Removal of hydrogen from coke oven gas

Increases its calorific value

Is not possible on commerical scale

Decreases its calorific value

Does not alter its calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

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