FUELS AND COMBUSTION QUIZ

The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.

Same as

Not related to

Higher than

Lower than

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following has the highest calorific value?

Lignite

Sub-bituminous coal

Anthracite

Peat

TRUE ANSWER : ?
YOUR ANSWER : ?

High sulphur content in a fuel __________ of the flue gases.

Reduces the combustion efficiency by limiting the permissible temperature reduction

Increases the dew point

Decreases the dew point

Both B & C

TRUE ANSWER : ?
YOUR ANSWER : ?

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

5000

1500

150

3500

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following constituents of coal is the most important in the production of coke?

Moisture

Ash

Carbon

Volatiles

TRUE ANSWER : ?
YOUR ANSWER : ?

Gross heating value of coal is __________ the net heating value.

Same as

None of these

Lower than

Higher than

TRUE ANSWER : ?
YOUR ANSWER : ?

Preheating of combustion air is done to

Reduce its requirement for effecting the complete combustion

Complete the combustion of fuel

Increase the adiabatic flame temperature

Increase the calorific value of the fuel

TRUE ANSWER : ?
YOUR ANSWER : ?

Fossil fuels mean

Liquid fuels

Solid fuels

Premature fuels with low calorific value

Those fuels which are found in the crust of earth

TRUE ANSWER : ?
YOUR ANSWER : ?

Mineral matter content (M) and ash content (A) in coal are approximately related as

M = 1.1A

M = A

M = 2A

M = 1.5A

TRUE ANSWER : ?
YOUR ANSWER : ?

Coke ovens in steel plant are heated by

Electricity

Coke oven gas

Both B & C

Mixed gas

TRUE ANSWER : ?
YOUR ANSWER : ?

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