FUELS AND COMBUSTION QUIZ

Gray-King Assay and Roga Index of coal is a measure of its

Grindability

Caking and swelling properties

Abradability

Weathering properties

TRUE ANSWER : ?
YOUR ANSWER : ?

Bright coal

Contains more than 90% durain

Contains more than 90% fussain

Is non-coking

Contains mainly vitrain & clarain and is generally coking

TRUE ANSWER : ?
YOUR ANSWER : ?

Natural draft created by the chimney depends upon

Its height

Both A & B

Neither A nor B

Temperature of the flue gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the least calorific value (kcal/Nm³) ?

Sewage gas

Coke oven gas

Natural gas

Blast furnace gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Quantity of coke produced from metallurgical coal may be around __________ percent.

30

75

95

50

TRUE ANSWER : ?
YOUR ANSWER : ?

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

CH₄

CO

H₂O

CO₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following accounts for maximum energy loss in a boiler?

Unburnt carbon in flue gases

Incomplete combustion

Ash content in the fuel

Flue gases

TRUE ANSWER : ?
YOUR ANSWER : ?

Micum Index of a coke is a measure of its

Porosity

Reactivity

Hardness & strength

Bulk density

TRUE ANSWER : ?
YOUR ANSWER : ?

A particular coal is said to be free burning when it

None of these

Shows little or no fusing action

Gives smokeless burning

Burns completely

TRUE ANSWER : ?
YOUR ANSWER : ?

Rate of low temperature oxidation of coal due to bad storage conditions

Is accelerated by storage in large heaps with small surface to volume ratio

Does not vary with increase in surface area

Is more for low volatile coal compared to high volatile coal

Decreases with increase in surface area

TRUE ANSWER : ?
YOUR ANSWER : ?