Benzol
Pitch-cresosote mixture (PCM)
Napthalene
Ethylene
✅ The correct answer is option D.
Fuel and Combustion MCQs
Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain
CO
CO₂
H₂O
Both B & C
✅ The correct answer is option D.
Stack heat losses can be minimised by
Controlling the excess air
Oxygen enrichment of combustion air
Using low c.v. fuels
Maintaining proper draft in the furnace
✅ The correct answer is option A.
L.D. converter gas (produced in steel plant) comprises mainly of
CO (upto 65%) & CO₂
CO₂ & H₂
CO & O₂
CO₂ & O₂
✅ The correct answer is option A.
Coal tar (produced by high temperature carbonisation) is the main source of
Aromatic compounds
Alphatic compounds
Paraffins
Olefins
✅ The correct answer is option A.
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has
Higher calorific value
Lower hydrogen content
Both A & B
Neither A nor B
✅ The correct answer is option D.
The gas which contributes maximum to the heating value of natural gas is
CO
CO₂
H₂
CH₄
✅ The correct answer is option D.
As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.
Decreases
Increases
Remains same
May increase or decrease depending on the type of fuel
✅ The correct answer is option B.
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.
500
750
950
1100
✅ The correct answer is option B.
Main use of soft coke is as __________ fuel.
Domestic
Blastfurnace
Foundary
None of these
✅ The correct answer is option A.