FUELS AND COMBUSTION QUIZ

In flue gas analysis by Orsat's apparatus, oxygen is absorbed by

None of these

Cuprous chloride

Alkaline pyragllol solution

Potassium hydroxide

TRUE ANSWER : ?
YOUR ANSWER : ?

Percentage of hydrogen in coke oven gas may be around

60

45

25

10

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following fuels is the best for burning on chain grate stoker?

Coking coal

Pulverised coal

Caking coal

Non-caking coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

Calorific value of the fuel

Flame temperature achieved

Heat transfer rate to the stock in the furnace

Speed of combustion of fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

Fixed carbon in coal is defined as

Hundred minus the percentage of volatile matter, ash and moisture

The total quantity of carbon present in the coal

The one which is present in the residue after combustion

That present in volatile matters

TRUE ANSWER : ?
YOUR ANSWER : ?

Desirable "Micum Index" values of metal-lurical coke are

M40 > 10% and M10 < 78%

M40 > 4% and M10 < 80%

M40 > 78% and M10 < 10%

M40 > 98% and M10 < 2%

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ of the coal is the basis for Seylor's coal classification.

Proximate analysis

Calorific value

Caking index

Ultimate analysis

TRUE ANSWER : ?
YOUR ANSWER : ?

Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.

20

2.5

0.5

10

TRUE ANSWER : ?
YOUR ANSWER : ?

The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

Either lower or higher, depends on the type of fuel

Much lower

Same

Much higher

TRUE ANSWER : ?
YOUR ANSWER : ?

Out of the following fuels, the difference between the net and gross calorific value is maximum in case of

Pitch

Fuel oil

Bituminous coal

Blast furnace gas

TRUE ANSWER : ?
YOUR ANSWER : ?