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.
Petroleum Refinery Engineering MCQs
152. 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.
153. The yield of straight run LPG from crude oil is about __________ weight percent.
20-25
1-1.5
Oct-15
0.1-0.2
✅ The correct answer is option B.
154. Viscosity index of a lubricating oil
is the measure of its flash point.
is the measure of variation of viscosity with temperature.
should be low.
none of these.
✅ The correct answer is option B.
155. Paraffin base crude oil as compared to asphalt base crude gives
higher yield of straight run gasoline.
higher octane number gasoline.
lower viscosity index lube oil.
poorer yield of lube oil.
✅ The correct answer is option A.
156. Which of the following processes is used for the production of petroleum coke ?
Stabilisation
Visbreaking
Cracking
Reforming
✅ The correct answer is option C.
157. Which of the following theories of origin of petroleum does not explain the presence of nitrogen & sulphur compounds in crude oil?
Modern theory
Carbide theory
Engler theory
all (a), (b) and (c)
✅ The correct answer is option B.
158. Detergent is added as an additive in engine lubricating oil to
reduce deposit formation.
keep contaminants in suspension.
increase oxidation stability.
prevent rusting.
✅ The correct answer is option A.
159. Hydrofining is the most recent and effective method for the
removal of sulphur.
improvement of smoke point.
reduction of breathing loss.
improvement of viscosity index.
✅ The correct answer is option A.
160. Naphtha yield in straight run distillation of crude oil may be about __________ percent.
2
6
12
18
✅ The correct answer is option B.