FUELS AND COMBUSTION QUIZ

During combustion of coal on grate, clinker formation is increased by the

All of these

Low fusion point of ash (< 1100° C)

Use of preheated primary air

Use of thick fire bed

TRUE ANSWER : ?
YOUR ANSWER : ?

Coking coals are invariably

Lignites

Anthracites

Bituminous coals

Semi-anthracites

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in the oxygen content of the coal, its __________ decreases.

Neither A nor B

Both A & B

Calorific value

Caking power

TRUE ANSWER : ?
YOUR ANSWER : ?

Low temperature oxidation of coal during storage does not decrease its

Oxygen content

Caking power

None of these

Calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

Weathering of coal during storage causes

Reduction in coal size

Decrease in its caking capacity

All of these

Increase in its friability

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is called "blue gas"?

Producer gas

Coke oven gas

Water gas

Natural gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Gray King Assay and Swelling Index of a coal is a measure of its

Abradability

Agglutinating properties

Resistance to impact breakage

Swelling characteristics

TRUE ANSWER : ?
YOUR ANSWER : ?

Initial pressure of oxygen introduced into the 'bomb' of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around __________ atm.

3-5

60-65

95-100

25-30

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a single stage, fixed bed high pressure coal gasification process?

None of these

Lurgi Process

Winkler process

Kopper-Totzek process

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following fuels is the best for burning on chain grate stoker?

Caking coal

Non-caking coal

Pulverised coal

Coking coal

TRUE ANSWER : ?
YOUR ANSWER : ?

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