FUELS AND COMBUSTION QUIZ

Which of the following is not endothermic?

Partial oxidation

Gasification

Reforming

Cracking

TRUE ANSWER : ?
YOUR ANSWER : ?

Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as

M = A

M = 1.1 A

M = 0.5 A

M = 1.8 A

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Line

Pitch

Tar

Molasses

TRUE ANSWER : ?
YOUR ANSWER : ?

Preheating of a gaseous fuel results in increased

Ignition temperature

Flame temperature

Quantity of flue gas

Flame length

TRUE ANSWER : ?
YOUR ANSWER : ?

Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm³/ton coal (ash = 35%).

3500

1500

5000

150

TRUE ANSWER : ?
YOUR ANSWER : ?

A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

High sulphur content in the fuel

Presence of large quantity of hydrogen in the fuel

Low calorific value of the fuel

Lack of thorough mixing of fuel with air

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of tar is about __________ Kcal/kg.

16000

8800

12000

5000

TRUE ANSWER : ?
YOUR ANSWER : ?

Actual flame temperature is always lower than the adiabatic flame temperature, because there is

Neither A nor B

Both A & B

Always loss of heat from the flame

No possibility of obtaining complete combustion at high temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Both A and B

Maximum 200 tons should be stored in a heap

Neither A nor B

Height of the coal heap should be < 3 metres

TRUE ANSWER : ?
YOUR ANSWER : ?

Steam is intermittently admitted into the fuel bed during the production of producer gas to

Minimise the chances of clinker formation

Increase the gas production rate

Convert CO to CO₂

Increase the combustion rate

TRUE ANSWER : ?
YOUR ANSWER : ?

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