Fuels and Combustion Quiz

What is the main constituent of a fuel that gives a large amount of heat when burned?

• Carbon

• Nitrogen

• Hydrogen

• Oxygen

Which of the following is a non-renewable energy resource stored millions of years ago by photosynthesis?

• Coal

• Crude oil

• Wood

• Natural gas

What is the main disadvantage of solid fuels during burning?

• Produce a large amount of ash

• Require large storage tanks

• Produce unpleasant odor

• Highly inflammable

What is the minimum temperature at which a substance ignites and burns without further addition of heat from outside?

• Kindling temperature

• Boiling temperature

• Melting temperature

• Freezing temperature

Which of the following is the most important characteristic property of any fuel?

• Low moisture content

• High contents of non-combustible matters

• High calorific value

• High velocity of combustion

What is the significance of the % of carbon and hydrogen in coal?

• Higher % of carbon and hydrogen increases the moisture holding capacity of coal

• Higher % of carbon and hydrogen has no impact on the quality of coal

• Higher % of carbon and hydrogen reduce the size of combustion chamber required

• Higher % of carbon and hydrogen reduces the calorific value of coal

Why is the presence of sulfur undesirable in coal?

• Sulfur reduces the moisture holding capacity of coal

• Sulfur causes corrosion effects on equipment and affects the properties of metal

• Sulfur has no impact on the combustion products of coal

• Sulfur increases the calorific value of coal

What is the approximate composition of petroleum?

• C = 60 -64%, H = 20 -24%, S = 1 -1.5%, N+ O = 1.5 -2%

• C = 70 -74%, H = 15 -19%, S = 0.5 -1%, N+ O = 1 -2%

• C = 90 -94%, H = 5 -9%, S = 0.1 -0.5%, N+ O = 0.5 -1%

• C = 80 -84%, H = 10 -14%, S = 0.1 -0.5%, N+ O = Negligible

What is the main use of kerosene obtained from petroleum?

• Mainly used as a fuel in IC engine and dry cleaning

• Mainly used as a fuel for ships and metallurgical furnaces

• Mainly used as a solvent for fats and rubbers

• Mainly used as a domestic fuel in stoves and lamps

What is the average composition of natural gas?

• Methane = 80%, Ethane = 10%, Propane = 5%, Butane = 5%

• Methane = 88.5%, Ethane = 5.5%, Propane = 4%, Butane = 1.5%

• Methane = 90%, Ethane = 5%, Propane = 3%, Butane = 2%

• Methane = 85%, Ethane = 7%, Propane = 4%, Butane = 4%