FUELS AND COMBUSTION QUIZ

Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.

10 & 3

3 & 10

15 & 8

10 & 20

TRUE ANSWER : ?
YOUR ANSWER : ?

Quantity of coke produced from metallurgical coal may be around __________ percent.

50

30

95

75

TRUE ANSWER : ?
YOUR ANSWER : ?

In high temperature carbonisation (as compared to low temperature carbonisation) of coal

All of these

Calorific value of coke oven gas is less

Tar yield is less but free carbon in tar is more

Coke oven gas yield is more

TRUE ANSWER : ?
YOUR ANSWER : ?

Ignition temperature decreases progressively from anthracite to lignite, because

Volatile matter content increases

Carbon content decreases

Ash content increases

Moisture content increases

TRUE ANSWER : ?
YOUR ANSWER : ?

Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

It reduces its calorific value tremendously

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

There are chances of explosion during preheating

It reduces its flame temperature tremendously

TRUE ANSWER : ?
YOUR ANSWER : ?

Coke ovens in steel plant are heated by

Electricity

Mixed gas

Both B & C

Coke oven gas

TRUE ANSWER : ?
YOUR ANSWER : ?

The weathering index of a coal

Gives an idea of the fusion temperature of ash

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

Is related to its calorific value

Is a measure of its caking tendency

TRUE ANSWER : ?
YOUR ANSWER : ?

The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

CO₂, O₂, CO

CO, O₂, CO₂

CO₂, CO, O₂

O₂, CO₂, CO

TRUE ANSWER : ?
YOUR ANSWER : ?

Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.

None of these

Gasification

Hydrogenation

Carbonisation

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 : ?

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