InterviewSolution

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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

51.	The fuel should have high anti-knock value to make use of what?(a) Higher compression ratio(b) Lower compression ratio(c) Higher noise(d) Higher knockThe question was posed to me in final exam.The origin of the question is Properties of Conventional Fuels topic in portion Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» Right answer is (a) Higher COMPRESSION ratio To elaborate: Volatility indicates the TENDENCY of the FUEL to change from liquid to vapor form, and the fuel should have HIGH anti-knock value to make USE of a Higher compression ratio.

52.	Which catalyst is used in Alkylation?(a) Sulphuric acid(b) Hydrochloric acid(c) Sulphuric acid or hydrochloric acid(d) Di-chloric acidI have been asked this question in an online interview.This interesting question is from Fuels topic in section Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» The correct answer is (c) Sulphuric acid or hydrochloric acid The best explanation: 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.

53.	Which process is used to combine lighter hydrocarbons to higher hydrocarbons?(a) Alkylation(b) Hydrogenation(c) Polymerization(d) ReformingThe question was posed to me in unit test.Query is from Fuels in chapter Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» The correct option is (C) POLYMERIZATION Easiest explanation: 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.

54.	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 hydrocarbonsThis question was addressed to me in final exam.This interesting question is from Fuels in division Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» Correct choice is (c) Aromatic hydrocarbons Explanation: 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.

55.	Which process is used to improve the anti-knock qualities of gasoline?(a) Cracking(b) Alkylation(c) Reforming(d) HydrogenationThe question was asked in an internship interview.This interesting question is from Fuels topic in portion Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» RIGHT answer is (c) Reforming To explain I would say: 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.

56.	In which type of Cracking, aluminum silicates,or natural clay is used?(a) Thermal cracking(b) Catalytic cracking(c) Hydrogen cracking(d) Polymerized crackingThis question was addressed to me in an online interview.My question is taken from Fuels topic in portion Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» Right option is (B) CATALYTIC CRACKING Easy explanation: 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.

57.	What is the temperature maintained during the thermal cracking process?(a) 500^oC(b) 400^oc(c) 300^oC(d) 200^oCThis question was addressed to me in an interview.Origin of the question is Fuels in division Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» The correct option is (a) 500^oC The best explanation: 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.

58.	What is the pressure maintained during the process of thermal cracking?(a) 10-13Mpa(b) 1-3MPa(c) 0.1-0.5MPa(d) 6-7MPaThe question was posed to me during a job interview.This is a very interesting question from Fuels in division Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» Right ANSWER is (B) 1-3MPa The BEST I can explain: 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.

59.	What is the octane number of the gasoline obtained by thermal cracking?(a) 93(b) 75(c) 58(d) 60This question was posed to me in exam.Question is from Fuels in division Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» The CORRECT choice is (B) 75 To explain: 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.

60.	Which of the mentioned below not a process of obtaining gasoline?(a) Cracking(b) Polymerization(c) Alkylation(d) CastingThis question was posed to me in an international level competition.This is a very interesting question from Fuels topic in division Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» RIGHT answer is (d) CASTING The best explanation: Cracking, Polymerization, and alkylation are all the processes involved in the extraction of gasoline whereas casting is the PROCESS related to METAL.

61.	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 oilsI had been asked this question in an interview for internship.This key question is from Fuels in section Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» The CORRECT option is (a) HEAVY GAS OILS To explain: . 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.

62.	Crude is heated to about what temperature?(a) 100°C(b) 300°C(c) 400°C(d) 1000°CI got this question in an internship interview.Enquiry is from Fuels in section Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» The correct option is (C) 400°C Explanation: 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.

63.	Crude oil is subjected to which distillation process?(a) Fractional distillation(b) Steam distillation(c) Simple distillation(d) Zone distillationI had been asked this question by my school teacher while I was bunking the class.My doubt stems from Fuels topic in chapter Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» Correct choice is (a) FRACTIONAL distillation The best explanation: 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.

64.	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°CThis question was addressed to me in homework.My question is based upon Fuels topic in portion Fuels, Intake System & Leakage Preventers of Automotive Engine Design
Answer» The correct option is (b) 70° to 120°c The explanation: 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.