FUELS AND COMBUSTION QUIZ

Coke compared to the coal from which it has been made, contains

More carbon

Greater percentage of ash

Less volatile matter

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

N₂

H₂

CO₂

CH₄

TRUE ANSWER : ?
YOUR ANSWER : ?

Fusion point of coal ash increases with increase in its __________ content.

Lime and magnesia

Iron silicate

All of these

Iron sulphate

TRUE ANSWER : ?
YOUR ANSWER : ?

Blast furnace gas constitutes mainly of

N₂ & H₂

N₂ & CH₄

N₂ & CO

CH₄ & CO₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Percentage of methane in coke oven gas may be around

50

25

5

15

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal containing very high percentage of durain is called __________ coal.

Non-banded

Splint

Bright

Boghead

TRUE ANSWER : ?
YOUR ANSWER : ?

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

15 & 8

10 & 3

10 & 20

3 & 10

TRUE ANSWER : ?
YOUR ANSWER : ?

Higher percentage of ash in coal meant for the production of metallurgical grade coke

None of these

Causes brittleness in steel

Decreases the hardness of coke

Decreases the abrasion resistance of coke

TRUE ANSWER : ?
YOUR ANSWER : ?

Bomb calorimeter can be used to determine the __________ of the coal.

Sulphur content

Neither A nor B

Both A & B

Calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

Highly caking coals

May damage the coke oven walls during carbonisation

Produce weak coke

Produce strong coke

Both B and C

TRUE ANSWER : ?
YOUR ANSWER : ?

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