Petroleum Refinery Engineering MCQs : This section focuses on the "Petroleum Refinery Engineering". These Multiple Choice Questions (MCQs) should be practiced to improve the Petroleum Refinery Engineering skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Petroleum coke is commercially produced by the __________ process.
A. Hydrocracking
B. Visbreaking
C. Fluid catalytic cracking
D. Delayed coking
Question 2
Penetration test determines the __________ of the grease.
A. Stiffness
B. Lubricating properties (e.g. oilness)
C. Service temperature
D. Variation in viscosity with temperature
Question 3
The order of preference for feedstock to a catalytic reformer is
A. Catalytic naphtha - coking naphtha - virgin naphtha
B. Coking naphtha - virgin naphtha - catalytic naphtha
C. Virgin naphtha - catalytic naphtha - coking naphtha
D. Virgin naphtha - coking naphtha - catalytic naphtha
Question 4
Which of the following gasolines (unleaded) has the least octane number?
A. Catalytically cracked gasoline
B. Straight run gasoline
C. Catalytically reformed gasoline
D. Polymer gasoline
Question 5
1 centistoke is equal to __________ Redwood I seconds.
A. 1
B. 4.08
C. 0.408
D. 40.8
Question 6
Mercaptans is represented as (where R and R' are alkyl groups)
A. R-COOH
B. R-S-H
C. R-S-R
D. R-S-R'
Question 7
LPG stands for
A. Liquid petroleum gas
B. Liquified petrol gas
C. Liquid petrol gas
D. Liquefied petroleum gas
Question 8
In petroleum refining, the process used for conversion of hydrocarbons to aromatics is
A. catalytic cracking
B. catalytic reforming
C. hydrotreating
D. alkylation
Question 9
Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has
A. High pour point and low smoke point
B. Low viscosity index
C. High self-ingnition temperature
D. All of the above
Question 10
Octane number of gasoline produced by two stage fluidised catalytic cracking process is
A. 80
B. 87
C. 92
D. 97
Question 11
Which of the following hydrocarbons of same carbon atoms has minimum smoking tendency?
A. Paraffins
B. Naphthenes
C. Aromatics
D. Iso-paraffins
Question 12
Water content in the crude oil as it comes out of oil well may be upto __________ percent.
A. 2
B. 5
C. 10
D. 25
Question 13
Thermofer catalytic cracking process is a __________ process.
A. Fixed bed
B. Moving bed
C. Fluidised bed
D. Non-catalytic
Question 14
Feedstock for polymerisation is
A. Naphtha
B. Cracked gases rich in C₂ & C₄ olefins
C. Low boiling aromatics
D. None of these
Question 15
Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is
A. More than 100
B. Round about 100
C. Between 50 and 100
D. Less than 25
Question 16
Asphalts are
A. Low molecular weight & low boiling point compounds present in petroleum
B. Desirable in catalytic cracking feedstock, because they produce coke
C. Readily oxidisable and form carbonaceous sludge
D. All of the above
Question 17
95% (by volume) of LPG at 760 mm Hg pressure will evaporate at __________ °C.
A. 2
B. -40
C. 30
D. 55
Question 18
Flash point of a liquid petroleum fuel gives an idea about its
A. Volatility
B. Explosion hazards characteristics
C. Nature of boiling point diagram
D. All of the above
Question 19
__________ chloride present in crude petroleum as impurity is the most prolific producer of HCl during distillation.
A. Magnesium
B. Potassium
C. Calcium
D. Sodium
Question 20
Aromatics have the highes __________ of all the hydrocarbons of same carbon atoms.
A. Smoke point
B. Octane number
C. Cetane number
D. Viscosity
Question 21
The pressure (kg/cm² ) and temperature (°C) maintained in electrical desalters for crude oil are respectively
A. 10 and 120
B. 1 and 200
C. 50 and 250
D. 10 and 300
Question 22
Highest quality bitumen is produced from the __________ crude oil.
A. Paraffinic
B. Naphthenic
C. Intermediate
D. Mixed
Question 23
LSHS is a type of furnace oil, which
A. Is more viscous than high viscosity furnace oil (HVFO)
B. Stands for low sulphur heavy stock
C. Is an ideal fuel for metallurgical furnaces due to its lower sulphur content (< 1%)
D. All of the above
Question 24
High aniline point of a petrofuel (say diesel) indicates that
A. It is highly aromatic in nature
B. It is highly paraffinic in nature
C. It has a very low diesel index
D. Its ignition quality is very poor
Question 25
Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about __________ mm Hg absolute.
A. 1 to 5
B. 30 to 80
C. 250 to 350
D. 450 to 500
Question 26
Catalyst used in the catalytic cracking is
A. Silica-alumina
B. Silica gel
C. Vanadium pentoxide
D. Nickel
Question 27
Stabilisation of gasoline (petrol) means
A. Removal of dissolved gases from it
B. Increasing its oxidation stability
C. Improving its lead susceptibility
D. Increasing its vapour pressure
Question 28
Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of
A. Thermal cracking
B. Gum formation
C. Coking
D. Discoloration
Question 29
Pick out the wrong statement.
A. A pale color of petroleum product indicates lower viscosity
B. Color of petroleum products indicates the degree of refinement
C. Lighter petroleum distillates are lighter in color than the heavier residual oils
D. Flouroscene of oils helps to detect its adulteration
Question 30
Cetane number of alpha methyl naphthalene is assumed to be
A. 0
B. 100
C. 50
D. ∞
Question 31
A petroleum well is called 'dry', if it contains
A. Very little oil
B. No natural gas
C. Only natural gas
D. All of the above
Question 32
Aniline point test of an oil qualitatively indicates the __________ content of an oil.
A. Paraffin
B. Olefin
C. Aromatic
D. Naphthene
Question 33
Clay treatment of petroleum products
A. Decolorises & stabilises cracked gasoline
B. Desulphurise straight run gasoline & kerosene
C. Adsorb arsenic from feedstock to catalytic reforming
D. All of the above
Question 34
Which of the following is an additive used for improving the cetane number of diesel?
A. Tetraethyl lead
B. Tetramethyllead
C. Ethyl nitrate or acetone
D. None of these
Question 35
Carbon percentage (by weight) in crude petroleum may be about
A. 65
B. 75
C. 85
D. 95
Question 36
Flash point of diesel/kerosene (>50°C) is determined by the
A. Abel apparatus
B. Pensky-Martens apparatus
C. Saybolt chromometer
D. None of these
Question 37
Which of the following has the highest flash point of all?
A. Diesel
B. Kerosene
C. Petrol
D. Furnace oil
Question 38
Which of the following categories of gasoline has the highest lead susceptibility?
A. Straight run gasoline
B. Platinum reformed gasoline
C. Catalytical cracked gasoline
D. Polymer gasoline
Question 39
Good quality kerosene should have
A. Low smoke point
B. High smoke point
C. High aromatics content
D. Low paraffins content
Question 40
Pick out the wrong statement.
A. Alkylation produces a larger iso-paraf-fin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin
B. Catalytic alkylation processes use HF, AlCl3 & H₂SO₄ as Catalysts
C. All the alkylation processes use very high temperature (> 1000°C)
D. Gasoline having an octane number of 90 can be produced by alkylation process
Question 41
Deoiling of wax is done by its
A. Heating
B. Cooling
C. Solvent extraction
D. Both B & C
Question 42
Which of the following reactions is undesirable in the production of catalytically reformed gasoline?
A. Dehydrogenation of naphthene
B. Dehydrogenation of lower paraffins
C. Dehydrocyclisation of higher paraffins
D. Isomerisation of paraffins
Question 43
Testing of the knocking characteristics of petrofuels is done in a __________ engine.
A. Carnot
B. CFR (Co-operative fuel research)
C. Stirling
D. Diesel
Question 44
Cetane number of a diesel fuel is the measure of its
A. Ignition delay
B. Smoke point
C. Viscosity
D. Oxidation stability
Question 45
Solvent used in the Udex (glycol) extraction process for removal of light aromatics from cracked naphtha is
A. Propane
B. Diethylene glycol
C. Aqueous solution (10% water) of diethylene glycol
D. Methyl ethyl ketone (MEK)
Question 46
Which one is preferred for aircraft engine?
A. High viscosity index lube oil
B. Low viscosity index lube oil
C. High freezing point aviation fuel
D. None of these
Question 47
Diesel index.(an alternative index for expressing the quality of diesel) is
A. determined by using a test engine.
B. not related to aniline point.
C. equal to cetane number plus 3.
D. all (a), (b) & (c).
Question 48
Which of the following has the highest viscosity of all (at a given temperature)?
A. Naphtha
B. Fuel oil
C. Light diesel oil
D. Petrol
Question 49
Deoiling is the process of removal of oil from wax. It is done by the __________ process.
A. Solvent extraction
B. Sweating
C. Resettling
D. All of the above
Question 50
Operating condition in the electrical dehydrators for crude oil is about
A. 6.5 kgf/Cm² & 95°C
B. 1 atm. & 110 °C
C. 20 kgf/cm² & 110°C
D. 50 atm. and 150°C
Question 51
Which of the following has the highest octane number?
A. Aromatics
B. I-paraffins
C. Naphthenes
D. Olefins
Question 52
Extractor temperature is maintained at -20°C in Edeleanu process to reduce the __________ of kerosene.
A. Smoke point
B. Paraffins
C. Aromatics
D. Naphthenes
Question 53
Tetra-ethyl lead is added in gasoline to
A. Increase its smoke point
B. Reduce gum formation
C. Reduce the pour point
D. Increase its octane number
Question 54
Pick out the wrong statement.
A. Higher specific gravity of petroleum products means higher C/H ratio
B. Aromatics have lower specific gravity than corresponding paraffins
C. Hydrocarbons of low specific gravity (e.g, paraffins) possess the maximum thermal energy per unit volume
D. Hydrocarbons of high specific gravity (eg, aromatics) possess the maximum thermal energy per unit weight
Question 55
Complete removal of __________ from gasoline is done by Unisol process using caustic soda and methyl alcohol.
A. waxes
B. mercaptans
C. asphalt
D. diolefins
Question 56
The condesate obtained on compression of wet natural gas is termed as
A. Liquefied natural gasoline
B. Natural gasoline
C. Liquid natural gas
D. None of these
Question 57
Pick out the additive property of a lube oil out of following.
A. °API gravity
B. Specific gravity
C. Viscosity
D. Flashpoint
Question 58
Increase in the specific gravity of petroleum products indicates
A. Decrease in paraffin content
B. Increase in thermal energy per unit weight
C. Increase in aromatic content
D. Higher H/C ratio
Question 59
Operating temperature and pressure in catalytic reforming is about
A. 1-5 Kgf/cm² & 200°C
B. 15-45 Kgf/cm² & 450-550°C
C. 50 - 75 kgf/cm² & 600 - 800°C
D. 5-10 kgf/cm² & 150 - 250°C
Question 60
Catalyst used in alkylation process is
A. Sulphuric acid
B. Nickel
C. Silica gel
D. Alumina
Question 61
Pour point and freezing point is equal for
A. petrol
B. diesel
C. water
D. crude petroleum
Question 62
Octane number of n-heptane is assumed to be
A. 100
B. 0
C. 70
D. ∞
Question 63
Solvent used in the deasphalting process is
A. furfurol
B. phenol
C. propane
D. hexane
Question 64
Hydrogen percentage (by weight) in crude petroleum may be about
A. 5
B. 15
C. 25
D. 35
Question 65
Aniline point is a property of the
A. Diesel
B. LPG
C. Naphtha
D. Gasoline
Question 66
__________ converts n-paraffins to i-paraffins.
A. Alkylation
B. Polymerisation
C. Isomerisation
D. none of these
Question 67
Most commonly used crude heater before the fractionation tower in a refinery is the __________ heater.
A. electric immersion
B. pipestill
C. steam coil
D. none of these
Question 68
Mercaptans are
A. Low boiling sulphur compounds
B. Added in LPG cylinders to detect gas leakage by its smell
C. Undesirable in petrol, as they reduce its octane number
D. All of the above
Question 69
Which parameter is used for the grading of paraffin waxes?
A. Specific gravity
B. Melting point
C. Viscosity
D. Penetration number
Question 70
Which of the following is desirable in petrol (gasoline) but undesirable in kerosene?
A. Paraffins
B. Aromatics
C. Mercaptans
D. Naphthenic acid
Question 71
Which of the following has maximum hydrogen/carbon ratio (by weight)?
A. Naphtha
B. Gasoline
C. Diesel
D. Fuel oil
Question 72
Maximum sulphur percentage in low sulphur heavy stock (LSHS) furnace oil is about
A. 0.1
B. 1
C. 2.5
D. 3.5
Question 73
Illuminating characteristics of kerosene is expressed by its
A. smoke point
B. aniline point
C. luminosity number
D. aromatic content
Question 74
In a refinery petroleum crude is fractionated into gas fraction, light ends, intermediate distillates, heavy distillates, residues and by products. The group of products including gas oil, diesel oil and heavy fuel oil belongs to the fraction
A. Heavy distillates
B. Intermediate distillates
C. Light ends
D. Residues
Question 75
Crude topping column operates at __________ pressure.
A. Atmospheric
B. 10 atm
C. Vacuum
D. 3 atm
Question 76
The reservoir rock containing petroleum has
A. Low porosity
B. High permeability
C. High porosity
D. Both B and C
Question 77
Detergent is added as an additive in engine lubricating oil to
A. Reduce deposit formation
B. Keep contaminants in suspension
C. Increase oxidation stability
D. Prevent rusting
Question 78
Older crude petroleum
A. Is light and better
B. Gives more distillates
C. Gives less tar
D. All of the above
Question 79
The first crude oil refinery of India is located at
A. Naharkatiya
B. Digboi
C. Kochin
D. Madras
Question 80
Flash point of an oil is determined by the
A. Pensky Martens apparatus
B. Ramsbottom apparatus
C. Saybolt viscometer
D. Conradson apparatus
Question 81
Paraffins are desirable in lubricating oil, as it has got high
A. Viscosity
B. Viscosity index
C. Smoke point
D. Pour point
Question 82
The proper arrangement of the petroleum fractions in order of their boiling points is
A. Lubricating oil > diesel > petrol > LPG
B. Lubricating oil > petrol > diesel > LPG
C. Petrol > lubricating oil > diesel > LPG
D. Petrol > diesel > LPG > lubricating oil
Question 83
Salt content (measured as sodium chloride) in electrically desalted crude oil comes down to a level of about __________ ptb (pounds per thousand barrel).
A. 0.03
B. 3
C. 35
D. 70
Question 84
In sweetening process, solutizer agent used with caustic alkali is
A. Potassium isobutyrate
B. Sodium plumbite
C. Methanol
D. Phenol
Question 85
Pick out the correct statement about catalytic polymerisation.
A. H₂SO₄ polymerisation process gives gasoline rich in unsaturates
B. In H₂SO₄ polymerisation, H₃PO₄ is always used with 2% steam to prevent meta & ortho H₃PO₄ formation, which are inactive
C. Both A & B
D. Neither A nor B
Question 86
Pick out the wrong statement.
A. Aromatics have higher specific gravity than paraffins
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
C. Heavier petrofuels have higher GCV on weight basis (i.e., Kcal/kg) but lower GCV on volume basis (i.e., Kcal/litre)
D. Higher specific gravity of petrofuels means higher C/H ratio
Question 87
Ethyl mercaptan is a/an __________ compound.
A. Sulphur
B. Nitrogen
C. Oxygen
D. None of these
Question 88
Which of the following processes consumes hydrogen?
A. Fluid catalytic cracking
B. Visbreaking
C. Propane deasphalting
D. None of these
Question 89
Removal of light fractions from crude oil is called its
A. Sweetening
B. Dehydration
C. Stabilisation
D. Visbreaking
Question 90
Which of the following constituents present in petroleum is responsible for ash formation?
A. Nitrogen compounds
B. Organometallic compounds
C. Sulphur compounds
D. Oxygen compounds
Question 91
An upper limit of oil content is limited to about __________ percent for achieving efficient and satisfactory level of wax sweating.
A. 5
B. 15
C. 40
D. 60
Question 92
Crude oil produced by Indian oil fields are predominantly __________ in nature.
A. Paraffinic
B. Naphthenic
C. Asphaltic
D. Mixed base
Question 93
Which of the following has the lowest cetane number?
A. Aromatics
B. I-paraffins
C. Naphthene
D. Olefins
Question 94
Main boring diameter for petroleum well is 20-30 cms in diameter, while the depth of the oil well may be about __________ kms.
A. 0.1 to 0.5
B. 1.5 to 4.5
C. 7.5 to 12.5
D. 15-20
Question 95
Catalytic desulphurisation process used for sweetening of straight run gasoline and kerosene uses __________ as catalyst.
A. bauxite
B. fuller's earth
C. activated clay
D. all (a), (b) & (c)
Question 96
Pyrolysis of kerosene or natural gasoline is done to produce mainly the
A. Olefins and aromatics
B. Lighter paraffins
C. Stabilised gasoline
D. Diesel
Question 97
Which is the most undesirable component in kerosene ?
A. Aromatics
B. i-paraffins
C. n-paraffins
D. Naphthenes
Question 98
Gum formation in stored gasoline is mainly due to the
A. Alkylation of unsaturates
B. Presence of sulphur
C. Oxidation & polymerisation of unsaturates
D. Higher aromatic content
Question 99
Viscosity index of a lubricating oil
A. Is the measure of its flash point
B. Is the measure of variation of viscosity with temperature
C. Should be low
D. None of these
Question 100
Aromatics are desired constituents of
A. Lubricating oil
B. Diesel
C. Kerosene
D. Petrol
Question 101
The main use of heavy gas oil produced by the vacuum distillation unit is as a
A. Blending component for kerosene
B. Blending component for petrol
C. Feedstock for fluid catalytic cracking unit
D. None of these
Question 102
Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about __________ °C.
A. 50
B. 70
C. 90
D. 140
Question 103
Feed for reforming is generally
A. Naphtha or straight run gasoline
B. Reduced crude
C. Vacuum gas oil
D. Atmospheric gas oil
Question 104
Sour crude means the __________ bearing crude.
A. Asphalt
B. Sulphur compounds
C. Wax
D. Nitrogen compounds
Question 105
Pick out the correct statement.
A. Paraffins have higher octane number than corresponding iso-paraffin
B. Paraffins have lower smoke point than aromatics
C. Suitability of kerosene as a fuel & as an illuminant may be determined by char value test
D. Aviation fuel should have very high cloud point
Question 106
Pressure & temperature maintained in catalytic cracking is about
A. 2atm & 500°C
B. 10atm & 500°C
C. 30atm & 200°C
D. 50atm. & 750°C
Question 107
Reforming
A. Uses naphtha as feedstock
B. Does not much affect the molecular weight of the feed
C. Improves the quality & yield of gasoline
D. All of the above
Question 108
Higher viscosity of lubricating oil usually signifies
A. Lower Reid vapour pressure
B. Higher acid number
C. Higher flash point and fire point
D. Lower flash point and fire point
Question 109
Flash point of an oil gives an idea of the
A. nature of boiling point diagram of the system.
B. amount of low boiling fraction present.
C. explosion hazards.
D. all (a), (b) and (c).
Question 110
Crude oil is subjected to vacuum distillation in the last stage, because
A. High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose
B. Lighter/low boiling products are prone to thermal decomposition
C. High purity products can be obtained thereby
D. None of these
Question 111
The yield of straight run LPG from crude oil is about __________ weight percent.
A. 20-25
B. 1-1.5
C. 10-15
D. 0.1-0.2
Question 112
The average boiling point of aviation turbine fuel is closest to that of
A. Lubricating oils
B. LPG
C. Diesel
D. Kerosene
Question 113
Natural gasoline is produced
A. From oil wells
B. In oil refineries
C. By natural gas stripping
D. None of these
Question 114
Polymerisation
A. Produces i-octane from cracked gases containing i-butane and butene
B. Causes olefins to combine with each other
C. Causes aromatics to combine with each other
D. Is aimed at producing lubricating oil
Question 115
Reforming converts
A. Olefins into paraffins
B. Naphthenes into aromatics
C. Naphthenes into olefins
D. Naphthenes into paraffin
Question 116
Both asphalt and wax are produced by __________ base crude oils.
A. Naphthenic
B. Asphalt
C. Paraffin
D. Mixed
Question 117
Which is an anticing compound?
A. Amyl nitrate
B. Alcohals
C. Mercaptans
D. Pyridine
Question 118
The vacuum maintained in vacuum distillation unit for reduced crude is about __________ mmHg.
A. 1.2
B. 12
C. 120
D. 700
Question 119
Which of the following is not an important property of fuel oil/furnace oil?
A. Sulphur content
B. Viscosity
C. Aniline point
D. Flash point
Question 120
Which of the following tests is not done for transformer oil ?
A. Flash point and acid value.
B. Aniline point.
C. Dielectric strength.
D. Copper strip corrosion test.
Question 121
Reid vapour pressure of gasoline is the measure of its
A. Pour point
B. Cloud point
C. Vapour locking tendency
D. Carbon residue
Question 122
Which is the most undesirable component in kerosene?
A. Aromatics
B. I-paraffins
C. N-paraffins
D. Naphthenes
Question 123
Crude oil is transported inland from oil field to refineries, mainly by the
A. Road tankers
B. Rail tankers
C. Underground pipelines
D. None of these
Question 124
Molecular weight of crude petroleum may be around
A. 50
B. 250
C. 1500
D. 5000
Question 125
Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene.
A. Smoking tendency of hydrocarbons increases in the order : paraffins → isoparaffins → naphthenes → aromatics.
B. Smoking tendency of paraffins increases with decrease in its molecular weight.
C. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond.
D. Smoking tendency of aromatics decreases with increase in its molecular weight.
Question 126
With increase in the molecular weight of aromatic present in kerosene, its smoking tendency
A. Increases
B. Decreases
C. Remains same
D. Is unpredictable
Question 127
Catalyst used in the catalytic polymerisation is
A. Phosphoric acid on kieselghur
B. Aluminium chloride
C. Nickel
D. Vanadium pentaoxide
Question 128
Mercaptans are added to liquefied petroleum gas (LPG) to
A. Reduce its cost
B. Narrow down its explosion limit
C. Assist in checking its leakage from cylinder
D. Increase its calorific value
Question 129
Viscosity index of a lubricating oil
A. is the measure of its flash point.
B. is the measure of variation of viscosity with temperature.
C. should be low.
D. none of these.
Question 130
Iso-octane is used as a reference substance in the definition of octane number and it is assigned an octane number value of 100. Iso-octance is chemically known as
A. α-methyl naphthalene
B. 2-2-4 tri methyl pentane
C. 1, 3 butadiene
D. Tetra methyl ethylene
Question 131
Solvent used in duo-sol extraction for lube oil upgradation is a mixture of
A. propane & phenol-cresol mixture.
B. methyl ethyl ketone & glycol.
C. phenol & furfural.
D. propane & liquid sulphur dioxide.
Question 132
Sulphur content in lighter and heavier petroleum products is generally determined respectively by
A. Lamp method and bomb method
B. Bomb method and lamp method
C. Bomb method and quartz tube method
D. Quartz tube method and lamp method
Question 133
Cracking is
A. An exothermic reaction
B. An endothermic reaction
C. Favoured at very low temperature
D. None of these
Question 134
Hydrogen content in petroleum products varies from 12 to 15% (by weight). As a result the difference between gross and net heating value of petroleum fuels varies in the range of __________ kcal/kg.
A. 600-750
B. 250-350
C. 1000-1500
D. 2000-2500
Question 135
Pick out the wrong statement.
A. Higher temperature is employed in visbreaking than in thermal cracking
B. Pyrolysis is a mild thermal cracking process
C. Lead suceptibility of petrol produced by catalytic process is more than that produced by thermal cracking
D. Operating pressure and temperature in thermal cracking process is more than that in catalytic cracking process
Question 136
Aniline point is the
A. Characteristic property of diesel & lubricating oils
B. Measure of aromatic content of oil
C. Both A & B
D. Neither A nor B
Question 137
Gasoline yield in catalytic reforming of naphtha may be about __________ percent by weight.
A. 85
B. 65
C. 50
D. 98
Question 138
In case of liquid petrofuels, momentary combustion is observed at its
A. Flash point
B. Preheating temperature corresponding to viscosity of 25 centistokes
C. Flame temperature
D. Fire point
Question 139
Which of the following has the highest gum forming tendency in gosoline?
A. Paraffins
B. Diolefins
C. Aromatics
D. Naphthenes
Question 140
In the atmospheric pressure crude distillation, the content of __________ from lighter fraction to heavier ones.
A. sulphur increases
B. sulphur decreases
C. nitrogen decreases
D. none of these
Question 141
Name the endothermic reaction out of the following:
A. Catalytic cracking
B. Hydrocracking
C. Dehydrogeneration of naphthene to produce aromatic
D. Catalytic polymerisation
Question 142
__________ base crude oil is also called asphaltic crude.
A. Paraffinic
B. Naphthenic
C. Mixed
D. Aromatic
Question 143
Casing head gasoline is the liquid
A. Butane
B. Propane
C. Natural gas
D. Gasoline separated from wet natural gas by compression
Question 144
Naphthenic acid is a/an __________ compound.
A. Sulphur
B. Nitrogen
C. Oxygen
D. None of these
Question 145
The best method of determining sulphur in crude oil is by the __________ method.
A. Kjeldah
B. Duma
C. Bomb calorimeter
D. Junkar's calorimeter
Question 146
Petroleum
A. Is optically active
B. Constitutes mainly of olefins
C. Does not contain asphalt
D. Does not contain aromatics
Question 147
Lane and Garton classification of petroleum is based on its
A. Composition
B. Specific gravity
C. Optical properties
D. Viscosity
Question 148
Raw Kerosene has a smoke point of 15 mm. After it is subjected to dearomatisation by liquid SO₂ extraction (Edeleanu process), its smoke point may become __________ mm.
A. 5
B. 10
C. 25
D. 100
Question 149
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
A. 1
B. 2
C. 3
D. 4
Question 150
Which of the following factors does not govern the mechanism of petroleum formation from organic sources?
A. PH of the soil
B. Bacterial action
C. Heat
D. Pressure
Question 151
Which is the most effective catalyst used in catalytic cracking of petroleum products?
A. Iron oxide
B. Nickel
C. Vanadium pentoxide
D. Zeolite
Question 152
Flash point of an oil gives an idea of the
A. Nature of boiling point diagram of the system
B. Amount of low boiling fraction present
C. Explosion hazards
D. All of the above
Question 153
Molecular weight of petrol may be about
A. 40-60
B. 100-130
C. 250-300
D. 350-400
Question 154
With increase in density, the viscosity of petroleum products
A. Increases
B. Decreases
C. Remains same
D. Either A or B
Question 155
Which of the following is a non-regenerative fixed bed catalytic reforming process?
A. Hydroforming
B. Thermofer catalytic reforming
C. Platforming
D. Hyperforming
Question 156
Which of the following has the minimum °API gravity of all?
A. Diesel
B. Kerosene
C. Petrol
D. Furnace oil
Question 157
Solvent used in Edeleanu process is
A. Furfural
B. Propane
C. Liquid SO₂
D. Phenol
Question 158
Which of the following processes is used for the production of petroleum coke?
A. Stabilisation
B. Visbreaking
C. Cracking
D. Reforming
Question 159
Road grade bitumen is produced from vacuum residue by its
A. Aeration
B. Pyrolysis
C. Hydrogenation
D. Steam reforming
Question 160
The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to
A. Obviate catalyst poisoning
B. Maintain the reaction temperature
C. Sustain the reactor pressure
D. Hydrogenate the feed stock
Question 161
LPG when brought to atmospheric pressure & temperature will be a
A. Liquid lighter than water
B. Liquid heavier than water
C. Gas lighter than air
D. Gas heavier than air
Question 162
Casing head gasoline is the liquid
A. butane.
B. propane.
C. natural gas.
D. gasoline separated from wet natural gas by compression.
Question 163
Petroleum deposits are detected by the.
A. Oil seepage at the surface of the earth
B. Measuremet of density, elasticity and magnetic & electric properties of the rock in the crust of the earth
C. Age & nature of rocks inside the crust of the earth
D. All of the above
Question 164
Choose the correct statement.
A. Coking tendency increases with increasing molecular weight
B. Coking tendency decreases with increasing molecular weight
C. Higher pressure enhances coke formation
D. Coking is an exothermic reaction
Question 165
Tanks used for the storage of petroleum products (which are inflammable) should be painted with a __________ paint.
A. black
B. white
C. red
D. yellow
Question 166
The most commonly used feed stock for the reforming reactor is
A. Heavy fuel oil
B. Residuum
C. Straight run gasdine
D. Casing head gasoline
Question 167
Which of the following is used as a catalyst in fluidised bed catalytic cracking?
A. Silica-magnesia
B. Silica-alumina
C. Bentonite clays
D. All of the above
Question 168
Which of the following fractions of a crude oil will have the maximum gravity API (i.e. °API) ?
A. Diesel
B. Gasoline
C. Atmospheric gas oil
D. Vacuum gas oil
Question 169
Straight run petrol as compared to methyl/ethyl alcohol has
A. Lower calorific value
B. Lower octane number
C. Higher specific gravity
D. Higher ignition temperature
Question 170
Which of the following fractions of petroleum contains maximum sulphur?
A. Diesel
B. Gasoline
C. Naphtha
D. Atmospheric residue
Question 171
Naphthenic acid is represented by
A. CnH2n+2O₂
B. CnHsub>2n-2O₂
C. CnHsub>2n+2O₂ (n ≥ 6)
D. CnHsub>2n+6O₂ (n ≤ 6)
Question 172
Sulphuric acid treatment of petroleum products removes the __________ materials.
A. Gum forming
B. Color forming
C. Asphaltic
D. All of the above
Question 173
Petrolatum is
A. Same as petroleum ether
B. Petroleum coke
C. A mixture of microcrystalline wax in viscous hydrocarbon liquids
D. None of these
Question 174
A good lubricant should have high
A. viscosity index
B. volatility
C. pour point
D. none of these
Question 175
Pour point of a petrofuel is
A. Multiple of 3°F
B. Multiple of 5°F
C. 5°C below the temperature at which oil ceases to flow
D. None of these
Question 176
Natural gas recovered along with crude oil from oil wells is called wet natural gas which has a higher __________ compared to the dry natural gas.
A. Unsaturated hydrocarbon content
B. Calorific value
C. Quantity of propane
D. Quantity of butane
Question 177
Solvent naphtha' used mostly as a solvent in paints and perfumery is produced by the __________ of virgin naphtha into small boiling range cuts.
A. Steam reforming
B. Distillation
C. Desulphurisation
D. None of these
Question 178
Which of the following is used as a catalyst in fluidised bed catalytic cracking ?
A. Silica-magnesia
B. Silica-alumina
C. Bentonite clays
D. All (a), (b) and (c)
Question 179
Paraffin base crude oil as compared to asphalt base crude gives
A. higher yield of straight run gasoline.
B. higher octane number gasoline.
C. lower viscosity index lube oil.
D. poorer yield of lube oil.
Question 180
Liquefied petroleum Gas (LPG) used for the household cooking comprises mainly of
A. Propane & butane
B. Butane & ethane
C. Methane & ethane
D. Methane & carbon monoxide
Question 181
Hydrocracking employs
A. High pressure & temperature
B. Low pressure & temperature
C. High pressure and low temperature
D. High temperature and low pressure
Question 182
Fuel oil is subjected to visbreaking to reduce its
A. Pour point
B. Viscosity
C. Pressure drop on pumping
D. All of the above
Question 183
The octane number of aviation gasoline may be
A. 79
B. 87
C. 97
D. >100
Question 184
A multigrade lubricating oil means an oil having high
A. Viscosity index
B. Viscosity
C. Aniline point
D. Flash point
Question 185
Visbreaking process is used mainly for making
A. high cetane diesel
B. high octane gasoline
C. fuel oil
D. smoke free kerosene
Question 186
Cetane number of diesel used in trucks may be about
A. 50
B. 14
C. 35
D. 85
Question 187
Stabilisation of gasoline (petrol) means
A. removal of dissolved gases from it.
B. increasing its oxidation stability.
C. improving its lead susceptibility.
D. increasing its vapour pressure.
Question 188
In hydrofining catalytic desulphurisation process for sweetening of petroleum products, use of hydrogen
A. Enhances the desulphurisation process
B. Minimises coke formation
C. Both A & B
D. Neither A nor B
Question 189
The main reaction in reforming is the
A. Dehydrogenation of naphthenes
B. Hydrogenation of naphthenes
C. Hydrocracking of paraffins
D. Saturation of olefins
Question 190
Octane number (unleaded) of reformed gasoline may be upto
A. 60
B. 70
C. 80
D. 90
Question 191
The solvent used in Barisol dewaxing process is
A. Hexane
B. Furfural
C. Benzol and ethylene dichloride
D. Methyl ethyl ketone (MEK)
Question 192
True vapour pressure of a petroleum fraction __________ Reid vapour pressure.
A. Is less than
B. Is more than
C. Is same as
D. May be either more or less than
Question 193
Which of the following is the most widely used cracking process in oil refineries?
A. Dubbs process
B. T.C.C. moving bed process
C. Fluidised bed catalytic cracking process
D. Houdry's fixed bed process
Question 194
Smoke point of a test sample of kerosene is found to be 15 mm. On removal of __________ from it, the smoke point rises to 25 mm.
A. n-paraffins
B. olefins
C. aromatics
D. none of these
Question 195
In catalytic cracking process, olefins crack __________ times faster than in thermal cracking process.
A. 100
B. 200-300
C. 1000-10000
D. 10
Question 196
Products drawn from the top to bottom of the crude oil distillation column has progressively increasing
A. Boiling points
B. Molecular weight
C. C/H ratio
D. All of the above
Question 197
Petroleum is believed to have originated from __________ sources.
A. Vegetable
B. Animal
C. Both A & B
D. Neither A nor B
Question 198
Which of the following does not require preheating during storage in the storage tank as well as during atomisation through burners?
A. PCM
B. Tar
C. Light diesel oil
D. Low viscosity furnace oil
Question 199
The colour of gasoline is an indication of its
A. octane number.
B. lead susceptibility.
C. gum forming tendency & thoroughness of refining.
D. none of these.
Question 200
Research octane number refers to the
A. Low octane number motor fuels
B. High octane number motor fuels
C. High octane number aviation fuels
D. Unleaded motor fuels
Question 201
Liquefied Petroleum Gas (LPG) is mainly a mixture of
A. Propane & butane
B. Methane & ethane
C. High boiling olefins
D. High boiling naphthenes
Question 202
Smoke point of kerosene expresses its
A. Burning characteristics
B. Luminosity characteristics
C. Aromatic content directly
D. Lamp wick wetting characteristics
Question 203
Solution used in Doctor's treatment for the removal of mercaptans is
A. sodium hydroxide
B. sodium plumbite
C. cupric chloride
D. potassium isobutyrate
Question 204
__________ determination is not a very significant and important test for gasoline.
A. Gum & sulphur content
B. Viscosity
C. Octane number
D. Reid vapor pressure
Question 205
Clay treatment is used to remove
A. Salt from the crude oil
B. Colour & dissolved gases from cracked gasoline
C. Wax from lube oil
D. None of these
Question 206
The doctor's solution comprises of sodium plumbite in
A. Alcohal
B. Water
C. Aqueous caustic soda
D. Soda ash
Question 207
Crude petroleum oil is a __________ fuel.
A. Primary
B. Fossil
C. Both A & B
D. Secondary
Question 208
Petroleum liquid fuels having flash point greater than 66°C is considered as safe during storage and handling. Which of the following has flash point > 66°C ?
A. Naphtha
B. Petrol
C. Kerosene
D. Heavy fuel oil
Question 209
Phenols are added in gasoline to
A. Improve the octane number
B. Act as an antioxidant
C. Reduce its viscosity
D. Increase its pour point
Question 210
Olefins are
A. Saturated hydrocarbons
B. Unsaturated cyclic compounds (hydrocarbons)
C. Present in substantially good quantity in crude petroleum
D. None of these
Question 211
Aniline point of high speed diesel may be about __________ °C.
A. 35
B. 70
C. 105
D. 150
Question 212
Choose the correct statement.
A. Octane number of i-octane is zero
B. Octane number of paraffins increases with increasing number of carbon atoms
C. Branched chain paraffins have higher octane number than straight chain paraffins with same number of carbon atoms
D. The aromatics have lower octane number than naphthenes with same number of carbon atoms
Question 213
Which is almost absent in crude petroleum?
A. Olefins
B. Mercaptans
C. Naphthenes
D. Cycloparaffins
Question 214
The main use of heavy gas oil produced by the vacuum distillation unit is as a
A. blending component for kerosene.
B. blending component for petrol.
C. feedstock for fluid catalytic cracking unit.
D. none of these.
Question 215
Octane number of gasoline is a measure of its
A. resistance to knock.
B. ignition delay.
C. ignition temperature.
D. smoke point.
Question 216
Furfural solvent extraction is used for upgrading (by dissolving aromatics)
A. naphtha
B. lubricating oils
C. wax
D. cracking feedstock
Question 217
Which of the following has the maximum °API gravity of all?
A. Diesel
B. Kerosene
C. Petrol
D. Furnace oil
Question 218
Which of the following is used as a solvent in deasphalting of petroleum products?
A. Furfural
B. Propane
C. Methyl ethyl ketone
D. Liquid sulphur dioxide
Question 219
Presence of aromatics in
A. Diesel increases its cetane number
B. Kerosene increases its smoke point
C. Petrol increases its octane number
D. All of the above
Question 220
Flash point of motor gasoline may be around __________ °C.
A. 10
B. 45
C. 100
D. 150
Question 221
Which of the following tests is not done for transformer oil?
A. Flash point and acid value
B. Aniline point
C. Dielectric strength
D. Copper strip corrosion test
Question 222
Cetane number of high speed diesel must be?
A. 30
B. 45
C. 75
D. 95
Question 223
Molecular weight of crude oil is in the range of
A. 100-120
B. 230-250
C. 450-550
D. 600-850
Question 224
The main aim of cracking is to produce
A. Gasoline
B. Lube oil
C. Petrolatum
D. Coke
Question 225
Octane number (unleaded) of gasoline produced by isomerisation of butane may be about
A. 45
B. 55
C. 70
D. 90
Question 226
Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene.
A. Smoking tendency of hydrocarbons increases in the order : paraffins → isoparaffins → naphthenes → aromatics
B. Smoking tendency of paraffins increases with decrease in its molecular weight
C. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond
D. Smoking tendency of aromatics decreases with increase in its molecular weight
Question 227
Which of the following is not a sulphur compound present in petroleum ?
A. Thiophenes
B. Mercaptans
C. Sulphones
D. Pyroles
Question 228
Char value of Kerosene is the amount of charred oil deposition on the wick obtained after burning it in a standard wick lamp at a standard rate for 24 hours. Char value of a good quality kerosene should be less than __________ mg/kg of kerosene.
A. 1
B. 20
C. 100
D. 500
Question 229
__________ is not an important refinery process for upgrading the quality of lubricating oil.
A. Deoiling
B. Solvent refinning
C. Clay treatment
D. Hydrotreatment
Question 230
Main constituent of natural gas is
A. CH₄
B. C₂H₂
C. C₂H₄
D. C₂H₆
Question 231
The amount of tetraethyl lead added to improve the octane number of motor gasoline is around __________ c.c per gallon of petrol.
A. 3
B. 300
C. 3000
D. 1000
Question 232
__________ test is done to find out the softening point of bitumen.
A. Impact
B. Ball and ring
C. Flame
D. Viscosity
Question 233
Which of the following is the easiest to crack?
A. Paraffins
B. Olefins
C. Naphthenes
D. Aromatics
Question 234
Pick out the wrong statement.
A. Multigrade lubricating oils have high viscosity index
B. Paraffinic oil has very high viscosity index
C. Naphthenic oil has very low viscosity index
D. High viscosity index means a large change in viscosity with change in temperature
Question 235
Which one is used to determine the colour of petroleum products?
A. Colour comparator
B. Saybolt chromometer
C. Cleveland apparatus
D. None of these
Question 236
Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic
A. Cracking
B. Polymerisation
C. Reforming
D. Isomerisation
Question 237
In catalytic alkylation, higher iso-butane to olefin ratio gives
A. Low final boiling point product
B. Higher yield
C. Both A & B
D. Neither A nor B
Question 238
Platforming is a __________ process.
A. Moving bed
B. Fluidised bed
C. Non-regenerative & fixed bed
D. Regenerative
Question 239
Choose the correct statement regarding thermal cracking.
A. Moderate changes in operating temperature does not change the depth of cracking
B. Increased residence time results in the decreased severity of cracking
C. At low pressure, the yield of lighter hydrocarbons are more
D. Greater depth of cracking gives lower octane number gasoline
Question 240
Mercaptans are
A. low boiling sulphur compounds.
B. added in LPG cylinders to detect gas leakage by its smell.
C. undesirable in petrol, as they reduce its octane number.
D. all (a), (b) and (c)
Question 241
For gasoline, the flash point (<50°C) is determined by the
A. Abel apparatus.
B. Pensky-Marten's apparatus.
C. Saybolt chromometer.
D. none of these.
Question 242
The most suitable solvent for deasphalting vacuum residue is
A. Propane
B. Methyl ethyl ketone
C. Doctor's solution
D. Methanol amine
Question 243
With increase in the number of carbon and hydrogen atoms in hydrocarbon molecules, the density of petroleum products
A. Decreases
B. Increases
C. Remains same
D. Unpredictable from the data
Question 244
Which of the following additives improves the cetane number of diesel?
A. Amyl nitrate
B. Ethyl mercaptan
C. Napthenic acid
D. Tetra ethyl lead
Question 245
Aniline point is the temperature at which
A. Equal weight of diesel & the aniline are completely miscible
B. Equal weight of aniline & the test sample are completely miscible
C. Equal volume of aniline & the test sample are completely miscible
D. Aniline vaporises
Question 246
The most important property for a jet fuel is its
A. Viscosity
B. Freezing point
C. Calorific value
D. Flash point
Question 247
Doctor's solution used for sweetening of petroleum products is
A. Sodium plumbite
B. Sodium sulphite
C. Sodium thiosulphate
D. Lead sulphate
Question 248
Name the hydrocarbon having the poorest oxidation stability.
A. Naphthene
B. Olefin
C. Paraffin
D. Aromatics
Question 249
Breathing loss on storage of gasoline occurs due to the
A. Presence of unsaturated air
B. Fluctuation of ambient temperature during day and night
C. Both A & B
D. Neither A nor B
Question 250
The characterisation factor of crude petroleum oil is around
A. 3
B. 11
C. 22
D. 28
Question 251
Paraffin base crude oil as compared to asphalt base crude gives
A. Higher yield of straight run gasoline
B. Higher octane number gasoline
C. Lower viscosity index lube oil
D. Poorer yield of lube oil
Question 252
Pick out the undesirable property for a solvent meant for dewaxing of lube oil.
A. Complete miscibility with oil
B. High solubility of wax in the solvent
C. Both A & B
D. Neither A nor B
Question 253
Pick out the wrong statement.
A. Lower boiling paraffins have higher octane number than higher paraffins
B. Dehydrogenation of naphthenes to aromatics is a desirable reaction in reforming process
C. The most ideal feedstock for thermal reforming is dearomatised kerosene
D. Catalyst used in catalytic reforming is platinum on silica-alumina base
Question 254
Crude oils containing more than __________ kg of total salts (expressed in terms of NaCl) per thousand barrel is called a 'salty crude'.
A. 1
B. 5
C. 15
D. 25
Question 255
Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about __________ kg/cm² .
A. 1.5
B. 3
C. 6
D. 12
Question 256
The conductivity of crude oil-water mixture depends on the
A. PH value
B. Water percentage
C. Temperature
D. All of the above
Question 257
Gasoline extracted from natural gas (by compression and cooling) is called the __________ gasoline.
A. Polymer
B. Unleaded
C. Casing head
D. Straight run
Question 258
Water separometer index (modified) (WSIM) of a petrofuel is the measure of its
A. Emulsification tendency
B. Water separation characteristics
C. Water content
D. Water absorbing capacity from atmosphere
Question 259
Catalyst used in isomerisation process is
A. H₂SO₄
B. H₃PO₄
C. HF
D. AlCl3
Question 260
Methyl tertiary butyl ether (MTBE), a high octane (octane no. = 115) gasoline blending component is produced by the simple additive reaction of isobutylene with
A. Methyl alcohol
B. Ethyl alcohol
C. Methane
D. Ethane
Question 261
Which one of the following processes aims at producing higher yield of gaseous unsaturated hydrocarbons and aromatics like benzene & toluene?
A. Reforming
B. Pyrolysis
C. Alkylation
D. Hydrocracking
Question 262
Which of the following has the lowest viscosity (at a given temperature) of all?
A. Naphtha
B. Kerosene
C. Diesel
D. Lube oil
Question 263
Which of the following contains maximum sulphur?
A. Diesel
B. Petrol
C. Kerosene
D. Fuel oil
Question 264
Mercapsol and Unisol processes are meant for the
A. Dearomatisation of kerosene
B. Removal of mercaptans
C. Dewaxing
D. Decoloration
Question 265
The coking process normally mostly used in Indian oil refineries is the __________ coking process.
A. delayed
B. flexi
C. fluid
D. contact
Question 266
Dearomatisation of kerosene (by liquid sulphur dioxide extraction) is done to
A. Increase its smoke point
B. Improve its oxidation stability
C. Decrease the breathing loss
D. None of these
Question 267
Catalytic desulphurisation process used for sweetening of straight run gasoline and kerosene uses __________ as catalyst.
A. Bauxite
B. Fuller's earth
C. Activated clay
D. All of the above
Question 268
Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil
A. Gives higher yield of petrol
B. Lower octane number of petrol
C. Higher sulphur content in the product
D. Higher gum forming material in petrol
Question 269
Octane number of gasoline is a measure of its
A. Resistance to knock
B. Ignition delay
C. Ignition temperature
D. Smoke point
Question 270
Butadiene is a/an
A. Di-olefin
B. Naphthene
C. Aromatic
D. Olefin
Question 271
Octane numbers of motor gasoline used in India and America are respectively
A. 87 & 94
B. 94 & 87
C. 94 & 100
D. 83 & 100
Question 272
True boiling point apparatus is used for the
A. determination of characterisation factor.
B. evaluation of oil stocks.
C. determination of true vapour pressure.
D. none of these.
Question 273
In catalytic cracking, the
A. Gasoline obtained has a very low octane number
B. Pressure & temperature is very high
C. Gasoline obtained has very high aromatic content
D. Gasoline obtained has very high amount of gum forming compounds
Question 274
Pick out the wrong statement.
A. Pensky-Marten apparatus is used for determining flash points above 50°C
B. Characterisation factor of paraffinic crude oil is more than 12
C. Abel apparatus is used for determining flash points below 50°C
D. An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index
Question 275
Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm² is maintained during cracking mainly to
A. Increase the yield of light distillates
B. Suppress coke formation
C. Enhance the octane number of gasoline
D. Reduce gum content in gasoline
Question 276
Quinoline is a/an __________ compound.
A. Sulphur
B. Nitrogen
C. Oxygen
D. None of these
Question 277
Glycol added to petrol acts as a/an __________ agent.
A. Anti-knocking
B. Anti-icing
C. Anti-gum forming
D. Dewaxing
Question 278
Flash point of atmospheric distillation residue is determined by __________ apparates.
A. Pensky-Martens (closed cup type)
B. Abel
C. Cleveland (open cup type)
D. None of these
Question 279
Which is the most ideal feed stock for 'coking' process used for the manufacture of petroleum coke?
A. Naphtha
B. Vacuum residue
C. Light gas oil
D. Diesel
Question 280
The most widely used crude topping column in refineries is the __________ column.
A. Bubble-cap
B. Packed bed
C. Fluidised bed
D. Perforated plate
Question 281
Sweetening of petroleum product means the removal of
A. Sulphur & its compounds
B. Water
C. Organic impurities
D. Wax
Question 282
The general formula of naphthenes is
A. CnH2n + 2
B. CnH2n - 6 (where, n ≥ 6)
C. CnHn - 4
D. Same as that for olefins i.e. CnH2n
Question 283
Crude oil is pumped by a __________ pump.
A. gear
B. centrifugal
C. screw
D. reciprocating
Question 284
Carbon/hydrogen ratio (by weight) is maximum (out of following) for
A. Gasoline
B. Kerosene
C. Light gas oil
D. Heavy fuel oil
Question 285
Diesel index is defined as
A. (°API) x (Aniline Point, °F)/100
B. (°API) x (Aniline Point, °C)/100
C. (°API) x (100)/Aniline Point, °F
D. (°API) x (100)/Aniline Point, °C
Question 286
Waxy crudes are treated with chemical additives mainly to
A. Depress its pour point
B. Dissolve wax
C. Precipitate wax
D. Remove wax
Question 287
During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) __________ with increase in the amount of water.
A. Decreases
B. Increases
C. Remains unchanged
D. Decreases linearly
Question 288
Solvent used in duo-sol extraction for lube oil upgradation is a mixture of
A. Propane & phenol-cresol mixture
B. Methyl ethyl ketone & glycol
C. Phenol & furfural
D. Propane & liquid sulphur dioxide
Question 289
Smoke point of a good burning kerosene may be around __________ mm.
A. 0-5
B. 20-25
C. 60-75
D. 100-120
Question 290
Higher vapour pressure of gasoline indicates
A. Low flash point
B. High breathing loss
C. Both A & B
D. Neither A nor B
Question 291
True boiling point apparatus is used for the
A. Determination of characterisation factor
B. Evaluation of oil stocks
C. Determination of true vapour pressure
D. None of these
Question 292
Performance number of a liquid fuel is related to its
A. Wax content
B. Spontaneous ignition temperature
C. Knocking tendency
D. Sulphur content
Question 293
Maximum viscosity of tar/PCM/fuel oil for easy and efficient atomisation in conventional burner is __________ centistokes (or 100 Redwood I seconds).
A. 5
B. 25
C. 50
D. 100
Question 294
Operating condition in the electrical dehydrators for crude oil is about
A. 6.5 kgf/Cm2 & 95°C.
B. 1 atm. & 110 °C.
C. 20 kgf/cm2 & 110°C.
D. 50 atm. and 150°C.
Question 295
Isomerisation converts the __________ tot-paraffins.
A. Paraffins
B. Olefins
C. Naphthenes
D. None of these
Question 296
Diesel used in naval applications has a minimum cetane number of
A. 25
B. 35
C. 45
D. 65
Question 297
Waxes present in petroleum products
A. Can be separated out by distillation
B. Are not soluble in them
C. Crystallise out at low temperature
D. Decrease their viscosity
Question 298
Presence of sulphur in gasoline
A. Leads to corrosion
B. Increases lead susceptibility
C. Decreases gum formation
D. Helps during stabilisation
Question 299
Alkylation
A. Causes olefins to combine with each other
B. Causes olefins to combine with iso-paraffins
C. Converts iso-paraffin into olefin
D. Converts olefin into paraffin
Question 300
Catalyst used in catalytic polymerisation which produces polymer gasoline is
A. H₂SO₄
B. H₃PO₄
C. Both A & B
D. AlCl3
Question 301
Flash point of atmospheric distillation residue is determined by __________ apparates.
A. Pensky-Martens (closed cup type).
B. Abel.
C. Cleveland (open cup type)
D. none of these.
Question 302
Pick out the undesirable property for a solvent meant for dewaxing of lube oil.
A. Complete miscibility with oil.
B. High solubility of wax in the solvent.
C. Both (a) and (b).
D. Neither (a) nor (b).
Question 303
Which of the following is desirable in diesel and kerosene but is undersirable in gasoline?
A. Aromatics
B. Mercaptans
C. Paraffins
D. Naphthenic acid
Question 304
Catalyst used in catalytic reforming is
A. platinum on alumina
B. nickel
C. iron
D. aluminium chloride