FUELS AND COMBUSTION QUIZ

Caking coal is desirable for

Burning on firebars

Burning on travelling grate

All of these

Coke making

TRUE ANSWER : ?
YOUR ANSWER : ?

Pick the odd man out.

Wood

Briquettes

Pitch creosote mixture

Oil gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.

750

1100

500

950

TRUE ANSWER : ?
YOUR ANSWER : ?

Highly reactive coke have lower

Coke reactivity index (CRI)

Porosity

Both B and C

Critical air blast (CAB) value

TRUE ANSWER : ?
YOUR ANSWER : ?

Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.

25-30

3-5

60-65

95-100

TRUE ANSWER : ?
YOUR ANSWER : ?

Main use of hard coke produced by high temperature carbonisation is in the

Cupola in foundaries

Sinter making

Domestic ovens

Iron blast furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Air/gas ratio for complete combustion will be the highest for

Carburetted water gas

Gobar gas

LPG

Coke oven gas

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Caking power

Calorific value

Neither A nor B

Both A & B

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Mixing with blast furnace gas

Coke oven battery heating

Hot scarfing of steel slabs

Steel ladle drying

TRUE ANSWER : ?
YOUR ANSWER : ?

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

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

Have proper combustion by supplying it around the burner

Burn CO to CO₂

Dry and transport the coal

TRUE ANSWER : ?
YOUR ANSWER : ?

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