FUELS AND COMBUSTION QUIZ

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

Decreases with increase in surface area

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

Is more for low volatile coal compared to high volatile coal

Does not vary with increase in surface area

TRUE ANSWER : ?
YOUR ANSWER : ?

Gross and net calorific value of a fuel will be the same

Under no circumstances

If its hydrogen/hydrogen compound content is zero

If its ash content is zero

Ifits carbon content is very low

TRUE ANSWER : ?
YOUR ANSWER : ?

Preheating of combustion air is done to

Increase the adiabatic flame temperature

Complete the combustion of fuel

Reduce its requirement for effecting the complete combustion

Increase the calorific value of the fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

Ignition temperature decreases progressively from anthracite to lignite, because

Moisture content increases

Carbon content decreases

Ash content increases

Volatile matter content increases

TRUE ANSWER : ?
YOUR ANSWER : ?

Flue gas from the heating chamber of byproduct coke ovens is removed by

Forced draft fan

Induced draft fan

Steam ejector

Natural draft

TRUE ANSWER : ?
YOUR ANSWER : ?

Soft coke is not

None of these

Produced by low temperature carbonisation of coal

A domestic fuel

Used in blast furnaces

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of bituminous coal may be around __________ Kcal/kg.

500

6500

1500

20000

TRUE ANSWER : ?
YOUR ANSWER : ?

Abel apparatus is used for those oils, whose flash points are___°F.

>280

300-600

>120

TRUE ANSWER : ?
YOUR ANSWER : ?

C/H ratio is the maximum in case of

Naphtha

Natural gas

Coal

Furnace oil

TRUE ANSWER : ?
YOUR ANSWER : ?

Main use of soft coke is as __________ fuel.

Blastfurnace

None of these

Foundary

Domestic

TRUE ANSWER : ?
YOUR ANSWER : ?

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