FUELS AND COMBUSTION QUIZ

Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

It is stored in tall heaps

It contains large amount of volatile matter

Smaller fines are stored in large quantity

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Power alcohol as compared to straight run gasoline has lower

Viscosity

Specific gravity

Octane number

Calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.

18

6

12

24

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest calorific value?

Lignite

Sub-bituminous coal

Peat

Anthracite

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel) ?

Natural gas

Blast furnace gas

Carburetted water gas

Producers

TRUE ANSWER : ?
YOUR ANSWER : ?

The calorific value of a gas of composition CO₂ = 20%, H₂ = 50%, CH₄ = 30%, is y. If the composition of gas is changed to H₂ = 50%, CH₄ = 30%, CO₂ = 10%, N₂ = 10%, then the calorifice value will be

0.95 y

Y

1.05 y

1.8 y

TRUE ANSWER : ?
YOUR ANSWER : ?

Washing of coal decreases its

Ash content

Both B and C

Mineral matter content

Caking index

TRUE ANSWER : ?
YOUR ANSWER : ?

High amount of sulphur and phosphorous in coke causes

None of these

Brittleness of steel made by using it

Decrease in its calorific value

Increase in its strength

TRUE ANSWER : ?
YOUR ANSWER : ?

Blast furnace gas is a very poisonous gas because of its predominantly high __________ content.

CO₂

CH₄

H₂O

CO

TRUE ANSWER : ?
YOUR ANSWER : ?

Function of secondary air in pulverised coal firing is to

Reduce primary air requirement

Ensure efficient burning of coal around the burner

Dry the coal

Transport the coal to the burner

TRUE ANSWER : ?
YOUR ANSWER : ?

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