FUELS AND COMBUSTION QUIZ

A coal having high volatile matter content will

Burn with a small non-smoky flame

Give less yield of tar and gas on carbonisation

None of these

Have a very high calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO₂, 20%CO and 10%O₂. The percent excess oxygen used is

0

20

10

12.5

TRUE ANSWER : ?
YOUR ANSWER : ?

Blast furnace gas constitutes mainly of

N₂ & H₂

CH₄ & CO₂

N₂ & CH₄

N₂ & CO

TRUE ANSWER : ?
YOUR ANSWER : ?

The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.

Slow & low

Fast & high

Fast & slow

Slow & high

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following would require least amount of secondary air for combustion?

Anthracite containing 10% volatile matter and 8% ash

Semi-bituminous coal containing 25% ash and 20% volatile matter

Bituminous coal containing 20% ash and 25% volatile matter

Coke breeze containing 25% ash and 2% volatile matter

TRUE ANSWER : ?
YOUR ANSWER : ?

Grindability index of a coal is 100. It implies that the

Coal can't be pulverised

Coal can be pulverised with great difficulty

Coal can be easily pulverised

Power consumption in grinding the coal will be very high

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in the temperature of carbonisation of coal

Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content

All of these

Hydrogen content of coke oven gas increases due to cracking of hydrocarbons

Methane content in the coke oven gas decreases and carbon monoxide content increases

TRUE ANSWER : ?
YOUR ANSWER : ?

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

5

10

2

0.1

TRUE ANSWER : ?
YOUR ANSWER : ?

In Lurgi coal gasifier,

Entrainment of solids is higher

Low carbon conversion efficiency is achieved

Larger quantity of coal can be processed

Coking coals cannot be used

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following coke has the least percentage of ash?

Petroleum coke

Foundary coke

Beehive coke

Metallurgical coke

TRUE ANSWER : ?
YOUR ANSWER : ?