FUELS AND COMBUSTION QUIZ

Lignite is

A high rank coal

Can be used for gasification and steam generation

A black banded coal which burns with a non-smoky yellowish flame

A coking coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Naphthalene recovered from coke oven gas is used

As moisture proof coating on fibres

As a fuel in furnaces

For making electrodes

As moth balls (insecticides)

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is called "blue gas"?

Producer gas

Coke oven gas

Natural gas

Water gas

TRUE ANSWER : ?
YOUR ANSWER : ?

'Fat' coal means a coal having

Low calorific value

Low ash content

Non smoking tendency

High volatile matter

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Excessive power requirement of air blower

Intermittant and uncontrolled combustion of the fuel

High exit flue gas temperature from the furnace

Enhanced sensible heat loss in the flue gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not used as a binder in coal briquetting?

Line

Tar

Pitch

Molasses

TRUE ANSWER : ?
YOUR ANSWER : ?

Percentage of methane in coke oven gas may be around

5

50

15

25

TRUE ANSWER : ?
YOUR ANSWER : ?

Low temperature oxidation of stored coal results in the

All of these

Decrease in its caking power & calorific value

Increase in its oxygen content

Decrease in its carbon & hydrogen content

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in calorific value of fuels, their adiabatic flame temperatures

Remain unchanged

Decrease

May increase or decrease ; depends on the quantity of products of combustion

Increase

TRUE ANSWER : ?
YOUR ANSWER : ?

Octane number of 2, 2, 4 - trimethyl pen-tane is

In between 0 and 100

100

More than 100

TRUE ANSWER : ?
YOUR ANSWER : ?