FUELS AND COMBUSTION QUIZ

Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

Ash disposal problem

Erosion of induced draft fan blades

High power consumption in its transportation

Excessive fly-ash discharge from the stack

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest heat of combustion?

CO

C₂H₆

CH₄

H₂

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Blast furnace coke is made from coal by

High temperature carbonisation

Medium temperature carbonisation

Heating the coal in an oven in presence of air

Low temperature carbonisation

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Fusion point of coal ash increases with increase in its __________ content.

All of these

Iron sulphate

Lime and magnesia

Iron silicate

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Percentage of carbon monoxide in blast furnace gas may be around

14

22

8

52

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The weathering index of a coal

Is related to its calorific value

Is a measure of its size stability, when stored & exposed to weather

Is a measure of its caking tendency

Gives an idea of the fusion temperature of ash

TRUE ANSWER : ?
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In low temperature carbonisation (as compared to high temperature carbonisation) of coal

Aliphatic tar is produced

All of these

Free carbon in tar is more

Ammonia yield is more

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Fuel combustion is never cent per cent efficient due to

Dry gas/stack gas loss

Incomplete combustion

Moisture loss

All of these

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Coalification means the

Process of conversion of lignite into anthracite

Direct hydrogenation of coal

Complete combustion of coal

Underground gasification of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following gaseous fuels is likely to have the highest gross calorific value?

Producer gas

Natural gas

Sewage gas

LPG

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YOUR ANSWER : ?

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