vegetable
animal
both (a) and (b)
neither (a) nor (b)
✅ The correct answer is option C.
Engineering
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2742. Which of the following fuels has the highest calorific value per unit mass (kcal/kg)?
Coal
Kerosene
Natural gas
Furnace oil
✅ The correct answer is option D.
2743. Which of the following is the most reactive (as regards the formation of CO + H₂ from C + H₂O) ?
Blast furnace coke
Low temperature coke
Anthracite coal
Sub-bituminous coal
✅ The correct answer is option B.
2744. Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.
6
18
28
36
✅ The correct answer is option B.
2745. A petroleum well is called ‘dry’, if it contains
very little oil.
no natural gas.
only natural gas.
all (a), (b) and (c).
✅ The correct answer is option C.
2746. Which of the following constituents of a fuel does not contribute to its calorific value on combustion?
Hydrogen
Sulphur
Carbon
None of these
✅ The correct answer is option D.
2747. Smoke point of kerosene expresses its
burning characteristics.
luminosity characteristics.
aromatic content directly.
lamp wick wetting characteristics.
✅ The correct answer is option A.
2748. Petroleum
is optically active.
constitutes mainly of olefins.
does not contain asphalt.
does not contain aromatics.
✅ The correct answer is option A.
2749. Which of the following is the easiest to crack?
Paraffins
Olefins
Naphthenes
Aromatics
✅ The correct answer is option A.
2750. Name the endothermic reaction out of the following:
Catalytic cracking.
Hydrocracking.
Dehydrogeneration of naphthene to produce aromatic.
Catalytic polymerisation.
✅ The correct answer is option C.