FUELS AND COMBUSTION QUIZ

Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.

550

750

950

1150

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in calorific value of fuels, their adiabatic flame temperatures

May increase or decrease ; depends on the quantity of products of combustion

Increase

Decrease

Remain unchanged

TRUE ANSWER : ?
YOUR ANSWER : ?

Coke oven gas burns with an yellowish flame, because of the presence of

H₂

CH₄

NH₃

CO₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Washing of coal is done to reduce the

Mineral matter

Both B and C

Inherent impurities

Adhering impurities

TRUE ANSWER : ?
YOUR ANSWER : ?

The weathering index of a coal

Is a measure of its size stability, when stored & exposed to weather

Is a measure of its caking tendency

Gives an idea of the fusion temperature of ash

Is related to its calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

High temperature in gasification of coal favours

High production of CO₂

Both B and C

Low production of CO₂

High production of CO

TRUE ANSWER : ?
YOUR ANSWER : ?

Mott and Wheeler test is conducted on coke to find its

Phosphorus content

Abradability

Volatile matter content

Reactivity with O₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?

Durain

Vitrain

Clarain

Fussain

TRUE ANSWER : ?
YOUR ANSWER : ?

Main use of soft coke is as __________ fuel.

Foundary

None of these

Domestic

Blastfurnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Adiabatic flame temperature of a fuel is dependent on the initial temperature of

Neither A nor B

Fuel

Both A & B

Air

TRUE ANSWER : ?
YOUR ANSWER : ?

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