Presence of large quantity of hydrogen in the fuel
Low calorific value of the fuel
High sulphur content in the fuel
Lack of thorough mixing of fuel with air
✅ The correct answer is option D.
Fuel and Combustion MCQs
Which of the following would require least amount of secondary air for combustion?
Coke breeze containing 25% ash and 2% volatile matter
Anthracite containing 10% volatile matter and 8% ash
Bituminous coal containing 20% ash and 25% volatile matter
Semi-bituminous coal containing 25% ash and 20% volatile matter
✅ The correct answer is option A.
Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
Sulphur
Oxygen
Hydrogen
Carbon
✅ The correct answer is option B.
The internal energy of the combustion products is __________ compared to that of reactants.
More
Less
Equal
More or less ; (depends on the state of fuel.)
✅ The correct answer is option B.
Laboratory gas is obtained by the cracking of
Gasoline
Diesel
Fuel oil
Kerosene
✅ The correct answer is option D.
Naphthalene recovered from coke oven gas is used
As moisture proof coating on fibres
As moth balls (insecticides)
As a fuel in furnaces
For making electrodes
✅ The correct answer is option B.
Abel apparatus is used for those oils, whose flash points are___°F.
<120
>120
>280
300-600
✅ The correct answer is option A.
__________ has the widest inflammability limit (explosion limit) of all the gases.
Hydrogen
Carbon monoxide
Acetylene
Methane
✅ The correct answer is option C.
Which of the following fuel gases is heavier than air?
Blast furnace gas
Coke oven gas
Natural gas
Water gas
✅ The correct answer is option A.
Main use of hard coke produced by high temperature carbonisation is in the
Iron blast furnace
Cupola in foundaries
Sinter making
Domestic ovens
✅ The correct answer is option A.