FUELS AND COMBUSTION QUIZ

Prime coking coal is always blended with medium or non- coking coal before ear-bonisation

To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls

Both A & B

Because, it alone produces unreactive coke

Neither A nor B

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not used as a binder in coal briquetting?

Tar

Pitch

Line

Molasses

TRUE ANSWER : ?
YOUR ANSWER : ?

Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)

NCV at constant pressure

GCV at constant pressure

GCV at constant volume

NCV at constant volume

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of furnace oil is about __________ Kcal/kg.

20000

5000

15000

10000

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not endothermic?

Reforming

Gasification

Partial oxidation

Cracking

TRUE ANSWER : ?
YOUR ANSWER : ?

A coal with high __________ content, would ignite most easily.

Volatile matter

Fixed carbon

Oxygen

Ash

TRUE ANSWER : ?
YOUR ANSWER : ?

A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

5 to 15

3 to 4

1 to 2

20 to 40

TRUE ANSWER : ?
YOUR ANSWER : ?

The calorific value of natural gas is about __________ kcal/Nm³.

10, 000

35, 000

2500

25, 000

TRUE ANSWER : ?
YOUR ANSWER : ?

In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the

Gas yield is less

Ignition temperature of coke produced is less

Aromatic content of tar produced is more

Tar yield is more

TRUE ANSWER : ?
YOUR ANSWER : ?

'Wind loss' resulting from unscientific storage of coal may be the order of about __________ percent.

10.5

7.5

14.5

2.5

TRUE ANSWER : ?
YOUR ANSWER : ?

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