FUELS AND COMBUSTION QUIZ

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

Height of the coal heap should be < 3 metres

Neither A nor B

Both A and B

Maximum 200 tons should be stored in a heap

TRUE ANSWER : ?
YOUR ANSWER : ?

Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of

MgSO₄ & BaCl₂

MgCO₃ & NaCl

MgO & Na₂CO₃

BaSO₄ & NaCl

TRUE ANSWER : ?
YOUR ANSWER : ?

Cannel coal

All of these

Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named

Has a high volatile matter content and burns with a luminous smoky flame

Is non-coking

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

35

5

10

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest calorific value (kcal/Nm³) ?

Natural gas

Gobar gas

Carburetted water gas

LPG

TRUE ANSWER : ?
YOUR ANSWER : ?

Insitu theory and drift theory are related to the

Origin of coal

Origin of petroleum oil

Coalification

Variation of coal quality with depth

TRUE ANSWER : ?
YOUR ANSWER : ?

For long flame and easy ignition, the coal used should have

High calorific value

Low ash

High ash

High volatile matter

TRUE ANSWER : ?
YOUR ANSWER : ?

Size of blast furnace grade coke is __________ mm.

>100

15-25

25-80

0-15

TRUE ANSWER : ?
YOUR ANSWER : ?

Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.

1350

1400

1250

1100

TRUE ANSWER : ?
YOUR ANSWER : ?

Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its

Calorific value

Yield of carbonised products

Friability & oxygen content

Caking index

TRUE ANSWER : ?
YOUR ANSWER : ?