FUELS AND COMBUSTION QUIZ

Calorific value of wood gas is about __________ kcal/Nm³.

5400

1500

8500

3300

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.

8000

4000

1000

15000

TRUE ANSWER : ?
YOUR ANSWER : ?

The advantage of firing pulverised coal in the furnace lies in the fact, that it

Accelerates the burning rate and economises on fuel combustion

Permits the use of low fusion point ash coal

All of these

Permits the use of high ash content coal

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal having high volatile matter content will

Have a very high calorific value

Give less yield of tar and gas on carbonisation

None of these

Burn with a small non-smoky flame

TRUE ANSWER : ?
YOUR ANSWER : ?

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

>120

300-600

>280

TRUE ANSWER : ?
YOUR ANSWER : ?

Insitu theory and drift theory are related to the

Origin of petroleum oil

Coalification

Origin of coal

Variation of coal quality with depth

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal with high ash content

Is not subjected to washing

Is harder and stronger

Has higher calorific value

Has low quantity of mineral matter

TRUE ANSWER : ?
YOUR ANSWER : ?

Spontaneous combustion of coal on storage results due to

Inadequate ventilation

Storage in large heaps with small surface to volume ratio

All of these

Low temperature oxidation

TRUE ANSWER : ?
YOUR ANSWER : ?

Coalification means the

Process of conversion of lignite into anthracite

Direct hydrogenation of coal

Underground gasification of coal

Complete combustion of coal

TRUE ANSWER : ?
YOUR ANSWER : ?

The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be

27.6

23

47.3

42.9

TRUE ANSWER : ?
YOUR ANSWER : ?

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