FUELS AND COMBUSTION QUIZ

A coal having high volatile matter content will

Give less yield of tar and gas on carbonisation

Have a very high calorific value

Burn with a small non-smoky flame

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Fixed carbon

Volatile matter

Ash

Oxygen

TRUE ANSWER : ?
YOUR ANSWER : ?

The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

CO₂, CO, O₂

O₂, CO₂, CO

CO, O₂, CO₂

CO₂, O₂, CO

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 : ?

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

Neither A nor B

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

TRUE ANSWER : ?
YOUR ANSWER : ?

Oxygen percentage (by weight) in atmospheric air is

23

29

19

21

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

23

47.3

42.9

27.6

TRUE ANSWER : ?
YOUR ANSWER : ?

Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.

Sensible

Sensible and latent

Latent

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a binder for coal briquetting?

Bitumen

Coal tar

None of these

Molasses

TRUE ANSWER : ?
YOUR ANSWER : ?

Hard pitch is used for making

Plastics

Pulverised fuel

Perfumes

Insecticides

TRUE ANSWER : ?
YOUR ANSWER : ?

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