Higher calorific value
Lower hydrogen content
Both A & B
Neither A nor B
✅ The correct answer is option D.
Engineering
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3242. Coal tar (produced by high temperature carbonisation) is the main source of
Aromatic compounds
Alphatic compounds
Paraffins
Olefins
✅ The correct answer is option A.
3243. Abel apparatus is used for those oils, whose flash points are___°F.
<120
>120
>280
300-600
✅ The correct answer is option A.
3244. The gas which contributes maximum to the heating value of natural gas is
CO
CO₂
H₂
CH₄
✅ The correct answer is option D.
3245. __________ has the widest inflammability limit (explosion limit) of all the gases.
Hydrogen
Carbon monoxide
Acetylene
Methane
✅ The correct answer is option C.
3246. 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.
3247. 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.
3248. 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.
3249. Main use of soft coke is as __________ fuel.
Domestic
Blastfurnace
Foundary
None of these
✅ The correct answer is option A.
3250. 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.