Complete miscibility with oil.
High solubility of wax in the solvent.
Both (a) and (b).
Neither (a) nor (b).
✅ The correct answer is option C.
Engineering
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2672. Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
Gaseous
Solid
Liquid
Both B and C
✅ The correct answer is option D.
2673. Higher viscosity of lubricating oil usually signifies
lower Reid vapour pressure.
higher acid number.
higher flash point and fire point.
lower flash point and fire point.
✅ The correct answer is option C.
2674. Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.
50
1000
5000
10000
✅ The correct answer is option A.
2675. Hydrogen percentage (by weight) in crude petroleum may be about
5
15
25
35
✅ The correct answer is option B.
2676. A coal containing high amount of volatile matter will have
Low ignition temperature
Very little ash content
High fusion point of its ash
Low adiabatic flame temperature
✅ The correct answer is option A.
2677. Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has
high pour point and low smoke point.
low viscosity index.
high self-ingnition temperature.
all (a), (b) and.(c).
✅ The correct answer is option B.
2678. Which is the most effective catalyst used in catalytic cracking of petroleum products ?
Iron oxide
Nickel
Vanadium pentoxide
Zeolite
✅ The correct answer is option D.
2679. The main use of heavy gas oil produced by the vacuum distillation unit is as a
blending component for kerosene.
blending component for petrol.
feedstock for fluid catalytic cracking unit.
none of these.
✅ The correct answer is option C.
2680. A coal with high ash content
Has higher calorific value
Is harder and stronger
Is not subjected to washing
Has low quantity of mineral matter
✅ The correct answer is option B.