FUELS AND COMBUSTION QUIZ

In general, the limit of inflammability/explosion limit of fuel gases is widened by the

Increase in temperature (i.e. preheating)

All of these

Use of pure oxygen for combustion instead of air

Increase in gas pressure

TRUE ANSWER : ?
YOUR ANSWER : ?

Coke having higher porosity has

Lower strength

Higher reactivity

All of these

Lower bulk density

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.

1100

950

750

500

TRUE ANSWER : ?
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High excess air in combustion of fuels results in

None of these

Smoky flame

Increased fuel consumption

Incomplete combustion

TRUE ANSWER : ?
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Which of the following is the maximum coal producing state in India?

Jharkhand

Orissa

Assam

West Bengal

TRUE ANSWER : ?
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Coals used for the generation of producer gas should have

High volatile matter content

Very low ash content (8-10%)

High caking index

Low fusion point of ash

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.

8000

1000

6000

4000

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Mott and Wheeler test is conducted on coke to find its

Abradability

Phosphorus content

Volatile matter content

Reactivity with O₂

TRUE ANSWER : ?
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Sometimes water is sprayed during coal charging in the coke oven, which helps in

All of these

Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H₂ in the gas (due to the endothermic reaction represented by C + H₂O = CO + H₂)

Prevention of clinker formation in the oven

Controlling the dust nuisance while charging the coal

TRUE ANSWER : ?
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Which of the following is not a binder for coal briquetting?

None of these

Coal tar

Molasses

Bitumen

TRUE ANSWER : ?
YOUR ANSWER : ?