FUELS AND COMBUSTION QUIZ

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

LPG

Carburetted water gas

Gobar gas

Coke oven gas

TRUE ANSWER : ?
YOUR ANSWER : ?

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

3 & 10

10 & 20

10 & 3

15 & 8

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of phosphorous in metallurgical coal

Is not undersirable

Reduces its calorific value

Badly affects the quality of steel

Increases its caking power

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a by-product fuel?

Refinery gas

Blast furnace gas

Petrol

Pitch

TRUE ANSWER : ?
YOUR ANSWER : ?

Washing of coal is done to reduce the

Mineral matter

Adhering impurities

Both B and C

Inherent impurities

TRUE ANSWER : ?
YOUR ANSWER : ?

Short/intense flame is produced during combustion of gaseous fuel by using

High amount/current of combustion air

Low amount/current of combustion air

Preheated secondary air

Very little excess air

TRUE ANSWER : ?
YOUR ANSWER : ?

For every 10% increase in the excess air; the fuel consumption increases by __________ percent.

2

10

0.1

5

TRUE ANSWER : ?
YOUR ANSWER : ?

One kg of carbon for theoretically complete combustion requires __________ kg of air.

12

0.5

23

11.5

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion

Decreases

Either A or B, depends on other factors

Remains same

Increases

TRUE ANSWER : ?
YOUR ANSWER : ?

The main drawback of supplying more excess air in the combustion of fuel is the

High exit flue gas temperature from the furnace

Excessive power requirement of air blower

Intermittant and uncontrolled combustion of the fuel

Enhanced sensible heat loss in the flue gas

TRUE ANSWER : ?
YOUR ANSWER : ?

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