FUELS AND COMBUSTION QUIZ

Low temperature oxidation of coal during storage does not decrease its

None of these

Caking power

Oxygen content

Calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

Volumetric ratio of N₂ to O₂ in dry atmospheric air is

4.76

0.79

3.76

0.21

TRUE ANSWER : ?
YOUR ANSWER : ?

Bulk density of pulverised coal may be about __________ kg/m³.

1500

500

100

1000

TRUE ANSWER : ?
YOUR ANSWER : ?

Ammonia content in raw coke oven gas is about __________ gm/Nm³.

100

15

1

50

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is unsuitable fuel for producer gas manufacture?

Coal having high fusion point of its ash

Anthracite

Coke

Coal having low fusion point of its ash

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a poisonous fuel gas?

None of these

Blast furnace gas

Natural gas

Coke oven gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?

Bag filter

Hydrocyclones

Wet scrubber

Multicyclones

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ process is meant for direct hydrogenation of coal to produce liquid fuel.

None of these

Lurgi

Fischer-Tropsch

Bergius

TRUE ANSWER : ?
YOUR ANSWER : ?

With increases in carbonisation temperature

Methane percentage in the coke oven gas increases

Hydrogen percentage in the coke oven gas decreases

Tar yield increases

Coke even gas yield increases

TRUE ANSWER : ?
YOUR ANSWER : ?

Sometimes water is sprayed during coal charging in the coke oven, which helps in

Prevention of clinker formation in the oven

Controlling the dust nuisance while charging the coal

Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H₂ in the gas (due to the endothermic reaction represented by C + H₂O = CO + H₂)

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?