Petroleum Refinery Engineering MCQs

Option A: Organic rock

Option B: Chemical rock

Option C: Clastic rock

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Sedimentary rock

Option B: Igneous rock

Option C: Metamorphic rock

Option D: None of these

Correct Answer: Sedimentary rock ✔

Option A: Drill line system

Option B: Dogleg severity

Option C: Drill line stream

Option D: All of Above

Correct Answer: Dogleg severity ✔

Option A: Run in hole

Option B: Rip in hole

Option C: Rest in hole

Option D: None of these

Correct Answer: Run in hole ✔

Option A: Effective Source Rock

Option B: Potential Source Rock

Option C: Unconventional Source Rock

Option D: All of above

Correct Answer: Effective Source Rock ✔

Option A: A pale color of petroleum product indicates lower viscosity

Option B: Color of petroleum products indicates the degree of refinement

Option C: Lighter petroleum distillates are lighter in color than the heavier residual oils

Option D: Fluorescence of oils helps to detect its adulteration

Correct Answer: A pale color of petroleum product indicates lower viscosity ✔

Option A: Higher temperature is employed in visbreaking than in thermal cracking

Option B: Pyrolysis is a mild thermal cracking process

Option C: Lead susceptibility of petrol produced by catalytic process is more than that produced by

Option D: Operating pressure and temperature in thermal cracking process is more than that in catalytic

Correct Answer: Higher temperature is employed in visbreaking than in thermal cracking ✔

Option A: Higher specific gravity of petroleum products means higher C/H ratio

Option B: Aromatics have lower specific gravity than corresponding paraffins

Option C: Hydrocarbons of low specific gravity (e.g., paraffins) possess the maximum thermal energy per unit volume

Option D: Hydrocarbons of high specific gravity (e.g., aromatics) possess the maximum thermal energy per unit weight

Correct Answer: Aromatics have lower specific gravity than corresponding paraffins ✔

Option A: °API gravity

Option B: Specific gravity

Option C: Viscosity

Option D: Flashpoint

Correct Answer: °API gravity ✔

Option A: Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin

Option B: Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts

Option C: All the alkylation processes use very high temperature (> 1000°C)

Option D: Gasoline having an octane number of 90 can be produced by alkylation process

Correct Answer: All the alkylation processes use very high temperature (> 1000°C) ✔

Option A: With increase in the reactor pressure, octane number of gasoline decreases

Option B: With increase in the reactor temperature, gasoline yield decreases for a given conversion

Option C: Percentage conversion increases with increase in the catalyst to oil ratio

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Moderate changes in operating temperature does not change the depth of cracking

Option B: Increased residence time results in the decreased severity of cracking

Option C: At low pressure, the yield of lighter hydrocarbons are more

Option D: Greater depth of cracking gives lower octane number gasoline

Correct Answer: Greater depth of cracking gives lower octane number gasoline ✔

Option A: Iso-paraffin crack faster than n-paraffin.

Option B: Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic

Option C: Rate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking

Option D: None of these

Correct Answer: Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic ✔

Option A: Pensky-Marten apparatus is used for determining flash points above 50°C

Option B: Characterisation factor of paraffinic crude oil is more than 12

Option C: Abel apparatus is used for determining flash points below 50°C

Option D: An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

Correct Answer: An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index ✔

Option A: Aromatics have higher specific gravity than paraffins

Option B: Gross calorific value (GCV) of petrofuels is equal to (12400 – 2100 ρ2) where, ρ is the specific gravity of the fuel at 15.5°C

Option C: Heavier petrofuels have higher GCV on weight basis (i.e., Kcal/kg) but lower GCV on volume basis (i.e., Kcal/litre)

Option D: Higher specific gravity of petrofuels means higher C/H ratio

Correct Answer: Heavier petrofuels have higher GCV on weight basis (i.e., Kcal/kg) but lower GCV on volume basis (i.e., Kcal/litre) ✔

Option A: Octane number of i-octane is zero

Option B: Octane number of paraffins increases with increasing number of carbon atoms

Option C: Branched chain paraffins have higher octane number than straight chain paraffins with same number of carbon atoms

Option D: The aromatics have lower octane number than naphthenes with same number of carbon atoms

Correct Answer: Octane number of i-octane is zero ✔

Option A: Coking tendency increases with increasing molecular weight

Option B: Coking tendency decreases with increasing molecular weight

Option C: Higher pressure enhances coke formation

Option D: Coking is an exothermic reaction

Correct Answer: Coking tendency increases with increasing molecular weight ✔

Option A: Paraffins have higher octane number than corresponding iso-paraffin

Option B: Paraffins have lower smoke point than aromatics

Option C: Suitability of kerosene as a fuel & as an illuminant may be determined by char value test

Option D: Aviation fuel should have very high cloud point

Correct Answer: Paraffins have lower smoke point than aromatics ✔

Option A: Multigrade lubricating oils have high viscosity index

Option B: Paraffinic oil has very high viscosity index

Option C: Naphthenic oil has very low viscosity index

Option D: High viscosity index means a large change in viscosity with change in temperature

Correct Answer: High viscosity index means a large change in viscosity with change in temperature ✔

Option A: Depress its pour point

Option B: Dissolve wax

Option C: Precipitate wax

Option D: Remove wax

Correct Answer: Depress its pour point ✔

Option A: Adsorption refining operation

Option B: Fuel gas manufacture

Option C: Carbon electrode manufacture

Option D: Iron ore reduction

Correct Answer: Carbon electrode manufacture ✔

Option A: Gear

Option B: Centrifugal

Option C: Screw

Option D: Reciprocating

Correct Answer: Centrifugal ✔

Option A: Aluminium chloride

Option B: Alumina

Option C: Nickel

Option D: Phosphoric acid

Correct Answer: Aluminium chloride ✔

Option A: Paraffins

Option B: Naphthenes

Option C: Aromatics

Option D: Iso-paraffins

Correct Answer: Paraffins ✔

Option A: Gum & sulphur content

Option B: Viscosity

Option C: Octane number

Option D: Reid vapor pressure

Correct Answer: Viscosity ✔

Option A: From oil wells

Option B: In oil refineries

Option C: By natural gas stripping

Option D: None of these

Correct Answer: By natural gas stripping ✔

Option A: 2

Option B: -40

Option C: 30

Option D: 55

Correct Answer: 2 ✔

Option A: Aromatics

Option B: i-paraffins

Option C: n-paraffins

Option D: Naphthenes

Correct Answer: Aromatics ✔

Option A: Aromatic

Option B: Paraffin

Option C: Olefin

Option D: Naphthene

Correct Answer: Paraffin ✔

Option A: Paraffins

Option B: Diolefins

Option C: Aromatics

Option D: Naphthenes

Correct Answer: Diolefins ✔

Option A: 6.5 kgf/Cm2 & 95°C

Option B: 1 atm. & 110 °C

Option C: 20 kgf/cm2 & 110°C

Option D: 50 atm. and 150°C

Correct Answer: 6.5 kgf/Cm2 & 95°C ✔

Option A: Diesel

Option B: Kerosene

Option C: Petrol

Option D: Furnace oil

Correct Answer: Petrol ✔

Option A: Solvent extraction

Option B: Sweating

Option C: Resettling

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Sulphur increases

Option B: Sulphur decreases

Option C: Nitrogen decreases

Option D: None of these

Correct Answer: Sulphur increases ✔

Option A: Primary

Option B: Fossil

Option C: Both A. & B.

Option D: Secondary

Correct Answer: C. Both A. & B. ✔

Option A: Degree of refinement

Option B: Hydrocarbon content type (aromatic or paraffinic)

Option C: Ease of atomisation

Option D: Sulphur content

Correct Answer: Hydrocarbon content type (aromatic or paraffinic) ✔

Option A: Propane & phenol-cresol mixture

Option B: Methyl ethyl ketone & glycol

Option C: Phenol & furfural

Option D: Propane & liquid sulphur dioxide

Correct Answer: Propane & phenol-cresol mixture ✔

Option A: Catalytic cracking

Option B: Hydrocracking

Option C: Dehydrogeneration of Naphthene to produce aromatic

Option D: Catalytic polymerisation

Correct Answer: Dehydrogeneration of Naphthene to produce aromatic ✔

Option A: 1-5 Kgf/cm2 & 200°C

Option B: 15-45 Kgf/cm2 & 450-550°C

Option C: 50 – 75 kgf/cm2 & 600 – 800°C

Option D: 5-10 kgf/cm2 & 150 – 250°C

Correct Answer: 15-45 Kgf/cm2 & 450-550°C ✔

Option A: Naphtha

Option B: Kerosene

Option C: Diesel

Option D: Lube oil

Correct Answer: Naphtha ✔

Option A: Leads to corrosion

Option B: Increases lead susceptibility

Option C: Decreases gum formation

Option D: Helps during stabilisation

Correct Answer: Leads to corrosion ✔

Option A: Lower Reid vapour pressure

Option B: Higher acid number

Option C: Higher flash point and fire point

Option D: Lower flash point and fire point

Correct Answer: Higher flash point and fire point ✔

Option A: Diesel

Option B: Gasoline

Option C: Atmospheric gas oil

Option D: Vacuum gas oil

Correct Answer: Atmospheric gas oil ✔

Option A: 0.42 × (% distilled at 204°C)

Option B: 5 mm

Option C: 0.84 × (% distilled at 204°C)

Option D: 10 mm approximately

Correct Answer: 0.42 × (% distilled at 204°C) ✔

Option A: Determined by using a test engine

Option B: Not related to aniline point

Option C: Equal to cetane number plus 3

Option D: All A., B. & C.

Correct Answer: Equal to cetane number plus 3 ✔

Option A: Silica-alumina

Option B: Silica gel

Option C: Vanadium pentoxide

Option D: Nickel

Correct Answer: Silica-alumina ✔

Option A: Abel apparatus

Option B: Pensky-Marten’s apparatus

Option C: Saybolt chromometer

Option D: None of these

Correct Answer: None of these ✔

Option A: CH4

Option B: C2H2

Option C: C2H4

Option D: C2H6

Correct Answer: CH4 ✔

Option A: High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may

Option B: Lighter/low boiling products are prone to thermal decomposition

Option C: High purity products can be obtained thereby

Option D: None of these

Correct Answer: A. High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may
decompose ✔

Option A: Low boiling sulphur compounds

Option B: Added in LPG cylinders to detect gas leakage by its smell

Option C: Undesirable in petrol, as they reduce its octane number

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Paraffin

Option B: Olefin

Option C: Aromatic

Option D: Naphthene

Correct Answer: Aromatic ✔

Option A: Petrol

Option B: Diesel

Option C: Water

Option D: Crude petroleum

Correct Answer: Water ✔

Option A: 600-750

Option B: 250-350

Option C: 1000-1500

Option D: 2000-2500

Correct Answer: 600-750 ✔

Option A: Paraffinic

Option B: Naphthenic

Option C: Intermediate

Option D: None of these

Correct Answer: Paraffinic ✔

Option A: Sodium hydroxide

Option B: Sodium plumbite

Option C: Cupric chloride

Option D: Potassium isobutyrate

Correct Answer: Sodium plumbite ✔

Option A: Propane

Option B: Diethylene glycol

Option C: Aqueous solution (10% water) of diethylene glycol

Option D: Methyl ethyl ketone (MEK)

Correct Answer: Aqueous solution (10% water) of diethylene glycol ✔

Option A: Lower calorific value

Option B: Lower octane number

Option C: Higher specific gravity

Option D: Higher ignition temperature

Correct Answer: Lower octane number ✔

Option A: Impact

Option B: Ball and ring

Option C: Flame

Option D: Viscosity

Correct Answer: Ball and ring ✔

Option A: 100

Option B: 200-300

Option C: 1000-10000

Option D: 10

Correct Answer: 100 ✔

Option A: Coking

Option B: Visbreaking

Option C: Pyrolysis

Option D: None of these

Correct Answer: None of these ✔

Option A: Bauxite

Option B: Fuller’s earth

Option C: Activated clay

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: (°API) × (Aniline Point, °F)/100

Option B: (°API) × (Aniline Point, °C)/100

Option C: (°API) × (100)/Aniline Point, °F

Option D: (°API) × (100)/Aniline Point, °C

Correct Answer: (°API) × (Aniline Point, °F)/100 ✔

Option A: Gasoline

Option B: Kerosene

Option C: Light gas oil

Option D: Heavy fuel oil

Correct Answer: Gasoline ✔

Option A: Removal of dissolved gases from it

Option B: Increasing its oxidation stability

Option C: Improving its lead susceptibility

Option D: Increasing its vapour pressure

Correct Answer: Removal of dissolved gases from it ✔

Option A: CnH2n+2O2

Option B: CnH2n-2O2

Option C: CnH2n+2O2 (n ≥ 6)

Option D: CnH2n+6O2 (n ≤ 6)

Correct Answer: CnH2n-2O2 ✔

Option A: Reduced crude

Option B: Heavy ends

Option C: Asphalt

Option D: Residuum

Correct Answer: Reduced crude ✔

Option A: Burning characteristics

Option B: Luminosity characteristics

Option C: Aromatic content directly

Option D: Lamp wick wetting characteristics

Correct Answer: Burning characteristics ✔

Option A: Propane & butane

Option B: Butane & ethane

Option C: Methane & ethane

Option D: Methane & carbon monoxide

Correct Answer: Propane & butane ✔

Option A: Sweetening

Option B: Dehydration

Option C: Stabilisation

Option D: Visbreaking

Correct Answer: Stabilisation ✔

Option A: Furfural

Option B: Propane

Option C: Methyl ethyl ketone

Option D: Liquid sulphur dioxide

Correct Answer: Propane ✔

Option A: Gasoline

Option B: Asphalt

Option C: Diesel oil

Option D: Tar

Correct Answer: Diesel oil ✔

Option A: Removal of sulphur

Option B: Improvement of smoke point

Option C: Reduction of breathing loss

Option D: Improvement of viscosity index

Correct Answer: Removal of sulphur ✔

Option A: i-paraffins

Option B: Aromatics

Option C: n-paraffins

Option D: Naphthenes

Correct Answer: n-paraffins ✔

Option A: Vegetable

Option B: Animal

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Is more viscous than high viscosity furnace oil (HVFO)

Option B: Stands for low sulphur heavy stock

Option C: Is an ideal fuel for metallurgical furnaces due to its lower sulphur content (< 1%)

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: 20-25

Option B: 1-1.5

Option C: 10-15

Option D: 0.1-0.2

Correct Answer: 1-1.5 ✔

Option A: Wax content

Option B: Spontaneous ignition temperature

Option C: Knocking tendency

Option D: Sulphur content

Correct Answer: Spontaneous ignition temperature ✔

Option A: Discoloration of yellow glycerine

Option B: Sugar refining

Option C: Manufacture of carbon electrode

Option D: Blast furnace for reduction of iron ore

Correct Answer: Manufacture of carbon electrode ✔

Option A: 87 & 94

Option B: 94 & 87

Option C: 94 & 100

Option D: 83 & 100

Correct Answer: 87 & 94 ✔

Option A: High viscosity index lube oil

Option B: Low viscosity index lube oil

Option C: High freezing point aviation fuel

Option D: None of these

Correct Answer: High viscosity index lube oil ✔

Option A: Olefinic hydrocarbon

Option B: Naphtha

Option C: Fuel oil

Option D: Atmospheric residue

Correct Answer: Olefinic hydrocarbon ✔

Option A: Liquefied natural gasoline

Option B: Natural gasoline

Option C: Liquid natural gas

Option D: None of these

Correct Answer: Natural gasoline ✔

Option A: Low final boiling point product

Option B: Higher yield

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: Low final boiling point product ✔

Option A: Furfural

Option B: Propane

Option C: Liquid SO2

Option D: Phenol

Correct Answer: Liquid SO2 ✔

Option A: Pour point

Option B: Cloud point

Option C: Vapour locking tendency

Option D: Carbon residue

Correct Answer: Vapour locking tendency ✔

Option A: H2SO4 polymerisation process gives gasoline rich in unsaturates

Option B: In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: B. In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho
H3PO4 formation, which are inactive ✔

Option A: Reforming

Option B: Pyrolysis

Option C: Alkylation

Option D: Hydrocracking

Correct Answer: Reforming ✔

Option A: 50

Option B: 14

Option C: 35

Option D: 85

Correct Answer: 50 ✔

Option A: Increases

Option B: Decreases

Option C: Remain same

Option D: Either A. or B.

Correct Answer: Increases ✔

Option A: High cetane diesel

Option B: High octane gasoline

Option C: Fuel oil

Option D: Smoke free kerosene

Correct Answer: Fuel oil ✔

Option A: Reduce its cost

Option B: Narrow down its explosion limit

Option C: Assist in checking its leakage from cylinder

Option D: Increase its calorific value

Correct Answer: Assist in checking its leakage from cylinder ✔

Option A: Low octane number motor fuels

Option B: High octane number motor fuels

Option C: High octane number aviation fuels

Option D: Unleaded motor fuels

Correct Answer: Unleaded motor fuels ✔

Option A: Silica-magnesia

Option B: Silica-alumina

Option C: Bentonite clays

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Characteristic property of diesel & lubricating oils

Option B: Measure of aromatic content of oil

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: 5

Option B: 10

Option C: 25

Option D: 100

Correct Answer: 5 ✔

Option A: n-paraffins

Option B: Olefins

Option C: Aromatics

Option D: None of these

Correct Answer: Aromatics ✔

Option A: Heavy fuel oil

Option B: Residuum

Option C: Straight run gasoline

Option D: Casing head gasoline

Correct Answer: Straight run gasoline ✔

Option A: 1

Option B: 5

Option C: 15

Option D: 25

Correct Answer: 5 ✔

Option A: Resistance to knock

Option B: Ignition delay

Option C: Ignition temperature

Option D: Smoke point

Correct Answer: Resistance to knock ✔

Option A: Enhances the desulphurisation process

Option B: Minimises coke formation

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔