FUELS AND COMBUSTION QUIZ

As the equilibrium moisture content of the coal increases, its

Bulk density decreases

Swelling number decreases

Swelling number increases

Calorific value increases

TRUE ANSWER : ?
YOUR ANSWER : ?

Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.

Oxygen

Temperature

Carbon monoxide

Smoke

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a product of tar distillation?

Phenol & naphthalene

None of these

Anthracene & creosote

Benzol & pitch

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about

25000 kcal/kg

Same as that of coal middling

8800 kcal/kg

8800 kcal/m³

TRUE ANSWER : ?
YOUR ANSWER : ?

Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.

20

10

5

35

TRUE ANSWER : ?
YOUR ANSWER : ?

During coking of coal, the ash content (percentage)

Decreases

Remains constant

None of these

Increases

TRUE ANSWER : ?
YOUR ANSWER : ?

Blast furnace gas constitutes mainly of

N₂ & CO

N₂ & CH₄

CH₄ & CO₂

N₂ & H₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Safe condition for storage of high V.M. bituminous coal is that

Both A and B

Maximum 200 tons should be stored in a heap

Height of the coal heap should be < 3 metres

Neither A nor B

TRUE ANSWER : ?
YOUR ANSWER : ?

Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

Both A & B

Higher calorific value

Lower hydrogen content

Neither A nor B

TRUE ANSWER : ?
YOUR ANSWER : ?

Low temperature carbonisation of coal produces

Soft coke

Very low calorific value coke oven gas

Metallurgical coke

No by-products

TRUE ANSWER : ?
YOUR ANSWER : ?

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