250+ TOP MCQs on Fuels – Refining of Crude Oil and Answers

Automotive Engine Auxiliary Systems Multiple Choice Questions on “Fuels – Refining of Crude Oil”.

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1. Crude oil is subjected to which distillation process?
a) Fractional distillation
b) Steam distillation
c) Simple distillation
d) Zone distillation
Answer: a
Clarification: Crude oil distillation is done in the Fractional column. Crude oil is heated to about 400^oC in a fractional distillation column. Above this temperature, different fuels like petrol, diesel, and kerosene are extracted.

2. Crude is heated to about what temperature?
a) 100°C
b) 300°C
c) 400°C
d) 1000°C
Answer: c
Clarification: Crude oil is heated to about 400°C in a fractional distillation column andthe fraction obtained in the fractionating column is in the range of about 70° to 120°C and is known as straight-run gasoline.

3. Straight run gasoline in the fractional column is obtained at what temperature?
a) 135°C to 170°C
b) 70° to 120°c
c) 8°C to 25°C
d) 130°C to 150°C
Answer: b
Clarification: The fraction obtained in the fractionating column is in the range of about 70° to 120°c and is known as straight-run gasoline. The vaporized crude oil is again passed through the heater and vacuum to obtain heavy gas oils and lubricating oils.

4. What is obtained when the vaporized crude oil is again passed through the heater and vacuum?
a) Heavy gas oils
b) lubricating oils
c) Petrol
d) Both heavy gas oils and lubricating oils
Answer: a
Clarification:. The vaporized crude oil is passed through the heater and vacuum to obtain heavy gas oils and lubricating oils. Heavy gas oils have higher pressure and temperature and burn completely.

5. Which of the mentioned below not a process of obtaining gasoline?
a) Cracking
b) Polymerization
c) Alkylation
d) Casting
Answer: d
Clarification: Cracking, Polymerization, and alkylation are all the processes involved in the extraction of gasoline whereas casting is the process related to metal.

6. What is the octane number of the gasoline obtained by thermal cracking?
a) 93
b) 75
c) 58
d) 60
Answer: b
Clarification:The octane number of the gasoline obtained by thermal cracking is 75, 1-3MPa the pressure maintained during the process of thermal cracking and 500^oC is the temperature maintained during the thermal cracking process.

7. What is the pressure maintained during the process of thermal cracking?
a) 10-13Mpa
b) 1-3MPa
c) 0.1-0.5MPa
d) 6-7MPa
Answer: b
Clarification: The octane number of the gasoline obtained by thermal cracking is 75, 1-3MPa the pressure maintained during the process of thermal cracking and 500^oC is the temperature maintained during the thermal cracking process.

8. What is the temperature maintained during the thermal cracking process?
a) 500^oC
b) 400^oc
c) 300^oC
d) 200^oC
Answer: a
Clarification: The octane number of the gasoline obtained by thermal cracking is 75, 1-3MPa the pressure maintained during the process of thermal cracking and 500^oC is the temperature maintained during the thermal cracking process.

9. In which type of Cracking, aluminum silicates,or natural clay is used?
a) Thermal cracking
b) Catalytic cracking
c) Hydrogen cracking
d) Polymerized cracking
Answer: b
Clarification: Catalytic cracking is the improved form of thermal cracking wherein catalyst is used to promote cracking and aluminum silicate or natural clay is the catalyst.

10. Which process is used to improve the anti-knock qualities of gasoline?
a) Cracking
b) Alkylation
c) Reforming
d) Hydrogenation
Answer: c
Clarification:The reforming process is used to improve the anti-knock qualities of gasoline.In the process of reforming, the straight-chain paraffin and naphthenes are converted to aromatic hydrocarbons.

11. In the process of reforming, the straight-chain paraffin and naphthenes are converted to what?
a) Branched hydrocarbons
b) Isometric hydrocarbons
c) Aromatic hydrocarbons
d) Alkene hydrocarbons
Answer: c
Clarification: In the process of reforming, the straight-chain paraffin and naphthenes are converted to aromatic hydrocarbons.Straight chain hydrocarbons are stable when compared to branched hydrocarbons.

12. Which process is used to combine lighter hydrocarbons to higher hydrocarbons?
a) Alkylation
b) Hydrogenation
c) Polymerization
d) Reforming
Answer: c
Clarification: Polymerization is the process used to combine lighter hydrocarbons to higher hydrocarbons and sulphuric acid or hydrochloric acid is used as a catalyst in alkylation.

13. Which catalyst is used in Alkylation?
a) Sulphuric acid
b) Hydrochloric acid
c) Sulphuric acid or hydrochloric acid
d) Di-chloric acid
Answer: c
Clarification:Polymerization is the process used to combine lighter hydrocarbons to higher hydrocarbons and sulphuric acid or hydrochloric acid is used as a catalyst in alkylation. Catalysts doesn’t change the reaction but fasten the rate of reaction.