FUELS AND COMBUSTION QUIZ

'Fat coals' are those coals which have very high

Inherent moisture content

Caking capacity

Volatile matter content

Fusion point of its ash

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following can be made into briquettes without the use of a binder?

Lignite

None of these

Anthracite coal

Bituminous coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.

500

10

0.5

50

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

TRUE ANSWER : ?
YOUR ANSWER : ?

Anthracite coal

Burns with short, bluish, yellow-tipped flame producing very little smoke

Is essentially a coking coal

Contains more volatile matter than bituminous coal

Ignites more easily than bituminous coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Percentage of nitrogen in blast furnace gas may be around

25

80

55

5

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following petrographic constituents of coal is non-coking?

Durain

Clarain

Vitrain

Fussain

TRUE ANSWER : ?
YOUR ANSWER : ?

'Fuel' can be defined as a substance which produces heat by

Nuclear fusion

Combustion

Nuclear fission

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Combustion of pulverised coal compared to the lumpy coal

Provides better control of furnace temperature

Provides higher thermal efficiency & flame temperature

Facilitates combustion with lower excess air

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal with high ash content

Is not subjected to washing

Is harder and stronger

Has low quantity of mineral matter

Has higher calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?