FUELS AND COMBUSTION QUIZ

Junker's calorimeter is used to determine the calorific value of

Gaseous fuels

Pulverised coal

Fuel oil

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A good metallurgical coke should have very low

Fusion point of its ash

Sulphur & phosphorous content

Hardness & strength

Porosity

TRUE ANSWER : ?
YOUR ANSWER : ?

Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?

100

70

50

85

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of tar is about __________ Kcal/kg.

16000

8800

12000

5000

TRUE ANSWER : ?
YOUR ANSWER : ?

High excess air in combustion of fuels results in

Incomplete combustion

Increased fuel consumption

Smoky flame

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of phosphorous in metallurgical coal

Reduces its calorific value

Is not undersirable

Increases its caking power

Badly affects the quality of steel

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest flame speed?

H₂

CO

C₂H₆

CH₄

TRUE ANSWER : ?
YOUR ANSWER : ?

High rate of heating of coke ovens

Produces larger size coke

Increases the time of carbonisation

May damage its walls due to abrupt excessive swelling of coal

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The weathering index of a coal

Is a measure of its caking tendency

Is related to its calorific value

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

Gives an idea of the fusion temperature of ash

TRUE ANSWER : ?
YOUR ANSWER : ?

The calorific value of L.D. converter gas is about __________ Kcal/Nm³ .

4500

10000

1800

800

TRUE ANSWER : ?
YOUR ANSWER : ?

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