Petroleum Refinery Engineering — Part 2 MCQs with Explanations
Practice high-yield Chemical Engineering MCQs on Petroleum Refinery Engineering — Part 2 with worked academic solutions for FPSC, PPSC, PAEC, OGDCL.
Questions
40
Difficulty Level
Exam-Level
Target Exams
FPSC, PPSC, PAEC...
Estimated Time
48 mins
Exam-Level FPSC PPSC PAEC OGDCL
Verified for Commission Syllabus • Oct 14, 2026
40
Verified Practice Questions
Interactive test mode with detailed academic worked solutions
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Question 1 of 40
★ FPSC
★ PPSC
★ FPSC
★ PPSC
In case of liquid petrofuels, momentary combustion is observed at its
Correct Answer: Option A — Flash point
Detailed Academic Explanation:
Flash point is the correct answer to “In case of liquid petrofuels, momentary combustion is observed at its”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
1500 is the correct answer to “Molecular weight of crude petroleum may be around”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
The characterisation factor of crude petroleum oil is around
Correct Answer: Option B — 11
Detailed Academic Explanation:
11 is the correct answer to “The characterisation factor of crude petroleum oil is around”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
With increase in the number of carbon and hydrogen atoms in hydrocarbon molecules, the density of petroleum products
Correct Answer: Option B — Increases
Detailed Academic Explanation:
Increases is the correct answer to “With increase in the number of carbon and hydrogen atoms in hydrocarbon molecules, the density of petroleum products”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
All of the above is the correct answer to “Petroleum deposits are detected by the.”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Gum formation in stored gasoline is mainly due to the
Correct Answer: Option B — Presence of sulphur
Detailed Academic Explanation:
Presence of sulphur is the correct answer to “Gum formation in stored gasoline is mainly due to the”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Which of the following gasolines (unleaded) has the least octane number?
Correct Answer: Option B — Straight run gasoline
Detailed Academic Explanation:
Straight run gasoline is the correct answer to “Which of the following gasolines (unleaded) has the least octane number”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Which of the following categories of gasoline has the highest lead susceptibility?
Correct Answer: Option A — Straight run gasoline
Detailed Academic Explanation:
Straight run gasoline is the correct answer to “Which of the following categories of gasoline has the highest lead susceptibility”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to
Correct Answer: Option C — Sustain the reactor pressure
Detailed Academic Explanation:
Sustain the reactor pressure is the correct answer to “The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Pyrolysis of kerosene or natural gasoline is done to produce mainly the
Correct Answer: Option A — Olefins and aromatics
Detailed Academic Explanation:
Olefins and aromatics is the correct answer to “Pyrolysis of kerosene or natural gasoline is done to produce mainly the”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Performance number of a liquid fuel is related to its
Correct Answer: Option B — Spontaneous ignition temperature
Detailed Academic Explanation:
Spontaneous ignition temperature is the correct answer to “Performance number of a liquid fuel is related to its”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Breathing loss on storage of gasoline occurs due to the
Correct Answer: Option B — Fluctuation of ambient temperature during day and night
Detailed Academic Explanation:
Fluctuation of ambient temperature during day and night is the correct answer to “Breathing loss on storage of gasoline occurs due to the”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
0 is the correct answer to “Octane number of n-heptane is assumed to be”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Absolute vapor pressure of petrofuels is found by Reid bomb which is heated in water bath to 100°F. In Reid apparatus, the ratio of the volume of air chamber to that of the liquid fuel chamber is
Correct Answer: Option D — 4
Detailed Academic Explanation:
4 is the correct answer to “Absolute vapor pressure of petrofuels is found by Reid bomb which is heated in water bath to 100°F. In Reid apparatus, the ratio of the volume of air chamber to that of the liquid fuel chamber is”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Correct Answer: Option C — Crystallise out at low temperature
Detailed Academic Explanation:
Crystallise out at low temperature is the correct answer to “Waxes present in petroleum products”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Octane number (unleaded) of reformed gasoline may be upto
Correct Answer: Option D — 90
Detailed Academic Explanation:
90 is the correct answer to “Octane number (unleaded) of reformed gasoline may be upto”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Both B and C is the correct answer to “The reservoir rock containing petroleum has”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Sulphur compounds is the correct answer to “Sour crude means the __________ bearing crude.”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Penetration test determines the __________ of the grease.
Correct Answer: Option A — Stiffness
Detailed Academic Explanation:
Stiffness is the correct answer to “Penetration test determines the __________ of the grease.”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Isomerisation converts the __________ tot-paraffins.
Correct Answer: Option A — Paraffins
Detailed Academic Explanation:
Paraffins is the correct answer to “Isomerisation converts the __________ tot-paraffins.”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Sulphuric acid is the correct answer to “Catalyst used in alkylation process is”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
100-130 is the correct answer to “Molecular weight of petrol may be about”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is
Correct Answer: Option A — More than 100
Detailed Academic Explanation:
More than 100 is the correct answer to “Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
The amount of tetraethyl lead added to improve the octane number of motor gasoline is around __________ c.c per gallon of petrol.
Correct Answer: Option A — 3
Detailed Academic Explanation:
3 is the correct answer to “The amount of tetraethyl lead added to improve the octane number of motor gasoline is around __________ c.c per gallon of petrol.”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
True vapour pressure of a petroleum fraction __________ Reid vapour pressure.
Correct Answer: Option D — May be either more or less than
Detailed Academic Explanation:
May be either more or less than is the correct answer to “True vapour pressure of a petroleum fraction __________ Reid vapour pressure.”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Equal volumes of aniline and diesel oil when mixed at room temperature (during summer) was found to be completely mis-cible. It means that the aniline point of the diesel is __________ the room temperature.
Correct Answer: Option C — Same as
Detailed Academic Explanation:
Same as is the correct answer to “Equal volumes of aniline and diesel oil when mixed at room temperature (during summer) was found to be completely mis-cible. It means that the aniline point of the diesel is __________ the room temperature.”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Octane numbers of motor gasoline used in India and America are respectively
Correct Answer: Option A — 87 & 94
Detailed Academic Explanation:
87 & 94 is the correct answer to “Octane numbers of motor gasoline used in India and America are respectively”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Which is the most effective catalyst used in catalytic cracking of petroleum products?
Correct Answer: Option D — Zeolite
Detailed Academic Explanation:
Zeolite is the correct answer to “Which is the most effective catalyst used in catalytic cracking of petroleum products”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Glycol added to petrol acts as a/an __________ agent.
Correct Answer: Option B — Anti-icing
Detailed Academic Explanation:
Anti-icing is the correct answer to “Glycol added to petrol acts as a/an __________ agent.”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Which of the following has the highest viscosity of all (at a given temperature)?
Correct Answer: Option B — Fuel oil
Detailed Academic Explanation:
Fuel oil is the correct answer to “Which of the following has the highest viscosity of all (at a given temperature)”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Which of the following is used as a solvent in deasphalting of petroleum products?
Correct Answer: Option B — Propane
Detailed Academic Explanation:
Propane is the correct answer to “Which of the following is used as a solvent in deasphalting of petroleum products”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Which of the following reactions is undesirable in the production of catalytically reformed gasoline?
Correct Answer: Option B — Dehydrogenation of lower paraffins
Detailed Academic Explanation:
Dehydrogenation of lower paraffins is the correct answer to “Which of the following reactions is undesirable in the production of catalytically reformed gasoline”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Both A & B is the correct answer to “Aniline point is the”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Which of the following has the highest octane number?
Correct Answer: Option A — Aromatics
Detailed Academic Explanation:
Aromatics is the correct answer to “Which of the following has the highest octane number”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Correct Answer: Option C — Readily oxidisable and form carbonaceous sludge
Detailed Academic Explanation:
Readily oxidisable and form carbonaceous sludge is the correct answer to “Asphalts are”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Which one of the following processes aims at producing higher yield of gaseous unsaturated hydrocarbons and aromatics like benzene & toluene?
Correct Answer: Option A — Reforming
Detailed Academic Explanation:
Reforming is the correct answer to “Which one of the following processes aims at producing higher yield of gaseous unsaturated hydrocarbons and aromatics like benzene & toluene”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Wax from lube oil is the correct answer to “Clay treatment is used to remove”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Pick out the correct statement about catalytic polymerisation.
Correct Answer: Option B — In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho H3PO4 formation, which are inactive
Detailed Academic Explanation:
In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho H3PO4 formation, which are inactive is the correct answer to “Pick out the correct statement about catalytic polymerisation.”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about __________ °C.
Correct Answer: Option C — 90
Detailed Academic Explanation:
90 is the correct answer to “Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about __________ °C.”. This question is standard in competitive examination syllabi for Petroleum Refinery Engineering.
In competitive commission exams (FPSC, PPSC, KPPSC, SPSC, CSS, PMS), questions are frequently phrased with distractor options designed to catch rote learners. Whenever you answer an MCQ, read the Detailed Academic Explanation and Conceptual Anchor to understand why the remaining options are incorrect.