Latest Petroleum Objective Questions Part – 2
Q – 101 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.
Ans- Option B
Q – 102 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.
Ans- Option A
Q – 103 Both asphalt and wax are produced by __________ base crude oils.
A. naphthenic
B. asphalt
C. paraffin
D. mixed
Ans- Option D
Q – 104 Polymerization
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.
Ans- Option B
Q – 105 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.
Ans- Option A
Q – 106 In catalytic alkylation, higher iso-butane to olefin ratio gives
A. low final boiling point product
B. higher yield
C. both (a) and (b)
D. neither (a) nor (b)
Ans- Option A
Q – 107 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.
Ans- Option A
Q – 108 In catalytic cracking process, olefins crack __________ times faster than in thermal cracking process.
A. 100
B. 200-300
C. 1000-10000
D. 10
Ans- Option C
Q – 109 Which of the following additives improves the cetane number of diesel?
A. Amyl nitrate
B. Ethyl mercaptan
C. Napthenic acid
D. Tetra ethyl lead
Ans- Option B
Q – 110 Presence of sulphur in gasoline
A. leads to corrosion.
B. increases lead susceptibility.
C. decreases gum formation.
D. helps during stabilisation.
Ans- Option A
Q – 111 Aniline point of the diesel is a measure of its __________ content.
A. aromatic
B. paraffin
C. olefin
D. naphthene
Ans- Option B
Q – 112 Petroleum
A. is optically active.
B. constitutes mainly of olefins.
C. does not contain asphalt.
D. does not contain aromatics.
Ans- Option A
Q – 113 Aniline point is the
A. characteristic property of diesel & lubricating oils.
B. measure of aromatic content of oil.
C. both (a) and (b).
D. neither (a) nor (b).
Ans- Option C
Q – 114 A petroleum well is called ‘dry’, if it contains
A. very little oil.
B. no natural gas.
C. only natural gas.
D. all (a), (b) and (c).
Ans- Option C
Q – 115 95% (by volume) of LPG at 760 mm Hg pressure will evaporate at __________ C.
A. 2
B. -40
C. 30
D. 55
Ans- Option A
Q – 116 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.
Ans- Option C
Q – 117 Removal of light fractions from crude oil is called its
A. sweetening
B. dehydration
C. stabilisation
D. visbreaking
Ans- Option C
Q – 118 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.
Ans- Option A
Q – 119 With increase in density, the viscosity of petroleum products
A. increases
B. decreases
C. remains same
D. either (a) or (b)
Ans- Option A
Q – 120 Operating temperature and pressure in catalytic reforming is about
A. 1-5 Kgf/cm2 & 200C.
B. 15-45 Kgf/cm2 & 450-550C.
C. 50 – 75 kgf/cm2 & 600 – 800C.
D. 5-10 kgf/cm2 & 150 – 250C.
Ans- Option B
Q – 121 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.
Ans- Option A
Q – 122 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.
Ans- Option B
Q – 123 Isomerisation converts the __________ tot-paraffin’s.
A. paraffins
B. olefins
C. naphthenes
D. none of these
Ans- Option A
Q – 124 Hydro-fining is the most recent and effective method for the
A. removal of sulphur.
B. improvement of smoke point.
C. reduction of breathing loss.
D. improvement of viscosity index.
Ans- Option A
Q – 125 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 (a), (b) and (c).
Ans- Option D
Q – 126 Cetane number of high speed diesel must be ≥
A. 30
B. 45
C. 75
D. 95
Ans- Option B
Q – 127 Which of the following has the lowest flash point of all?
A. Diesel
B. Kerosene
C. Petrol
D. Furnace oil
Ans- Option C
Q – 128 Petroleum is believed to have originated from __________ sources.
A. vegetable
B. animal
C. both (a) and (b)
D. neither (a) nor (b)
Ans- Option C
Q – 129 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
Ans- Option C
Q – 130 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
Ans- Option A
Q – 131 The doctor’s solution comprises of sodium plumbite in
A. alcohal
B. water
C. aqueous caustic soda
D. soda ash
Ans- Option C
Q – 132 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 15.5C.
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.
Ans- Option C
Q – 133 Specific gravity of a petroleum product gives an indication of its
A. degree of refinement.
B. hydrocarbon content type (aromatic or paraffinic).
C. ease of atomisation.
D. sulphur content.
Ans- Option B
Q – 134 Catalyst used in the catalytic cracking is
A. silica-alumina
B. silica gel
C. vanadium pentoxide
D. nickel
Ans- Option A
Q – 135 The catalytic cracking of heavier petroleum fraction is done to produce mainly
A. gasoline
B. asphalt
C. diesel oil
D. tar
Ans- Option C
Q – 136 Carbon/hydrogen ratio (by weight) is maximum (out of following) for
A. gasoline
B. kerosene
C. light gas oil
D. heavy fuel oil
Ans- Option A
Q – 137 Maximum use of petroleum coke is in
A. adsorption refining operation.
B. fuel gas manufacture.
C. carbon electrode manufacture.
D. iron ore reduction.
Ans- Option C
Q – 138 Which is the most effective catalyst used in catalytic cracking of petroleum products?
A. Iron oxide
B. Nickel
C. Vanadium pentoxide
D. Zeolite
Ans- Option D
Q – 139 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.
Ans- Option A
Q – 140 Which of the following has the highest octane number?
A. Aromatics
B. i-paraffins
C. Naphthenes
D. Olefins
E. n-paraffins
Ans- Option A
Q – 141 The characterization factor of a crude oil is calculated as 12.5. It means that; it is
A. paraffinic
B. naphthenic
C. intermediate
D. none of these
Ans- Option A
Q – 142 Smoke point of kerosene expresses its
A. burning characteristics.
B. luminosity characteristics.
C. aromatic content directly.
D. lamp wick wetting characteristics.
Ans- Option A
Q – 143 Doctor’s solution used for sweetening of petroleum products is
A. sodium plumbite
B. sodium sulphite
C. sodium thiosulphate
D. lead sulphate
Ans- Option A
Q – 144 Absolute vapor pressure of petrofuels is found by Reid bomb which is heated in water bath to 100F. 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
Ans- Option D
Q – 145 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.
Ans- Option C
Q – 146 Smoke volatility index is equal to smoke point plus
A. 0.42 x(% distilled at 204C)
B. 5 mm
C. 0.84 x (% distilled at 204C)
D. 10 mm. approximately
Ans- Option A
Q – 147 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 (a), (b) & (c)
Ans- Option D
Q – 148 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
Ans- Option B
Q – 149 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) and (b).
D. neither (a) nor (b).
Ans- Option C
Q – 150 Which is the most desirable component of a good quality kerosene?
A. i-paraffins
B. Aromatics
C. n-paraffins
D. Naphthenes
Ans- Option C
Q – 151 Fuel oil is subjected to visbreaking to reduce its
A. pour point
B. viscosity
C. pressure drop on pumping
D. all (a), (b) and (c)
Ans- Option D
Q – 152 The reservoir rock containing petroleum has
A. low porosity
B. high permeability
C. high porosity
D. both (b) and (c)
Ans- Option D
Q – 153 Penetration test determines the __________ of the grease.
A. stiffness
B. lubricating properties (e.g. oilness)
C. service temperature
D. variation in viscosity with temperature
Ans- Option A
Q – 154 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
Ans- Option B
Q – 155 Bottom product of atmospheric pressure crude oil distillation column is termed as
A. reduced crude
B. heavy ends
C. asphalt
D. residuum
Ans- Option A
Q – 156 Which of the following processes in oil refinery does not employ ‘cracking’?
A. Coking
B. Visbreaking
C. Pyrolysis
D. None of these
Ans- Option D
Q – 157 Aniline point test of an oil qualitatively indicates the __________ content of an oil.
A. paraffin
B. olefin
C. aromatic
D. naphthene
Ans- Option C
Q – 158 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.
Ans- Option C
Q – 159 Which of the following has the highest gum forming tendency in gosoline?
A. Paraffins
B. Diolefins
C. Aromatics
D. Naphthenes
Ans- Option B
Q – 160 The most important property for a jet fuel is its
A. viscosity
B. freezing point
C. calorific value
D. flash point
Ans- Option B
Q – 161 Cracking is
A. an exothermic reaction.
B. an endothermic reaction.
C. favoured at very low temperature.
D. none of these.
Ans- Option B
Q – 162 Extractor temperature is maintained at -20C in Edeleanu process to reduce the __________ of kerosene.
A. smoke point
B. paraffins
C. aromatics
D. naphthenes
Ans- Option B
Q – 163 Which of the followingis desirable in petrol (gasoline) but undesirable in kerosene?
A. Paraffins
B. Aromatics
C. Mercaptans
D. Naphthenic acid
Ans- Option C
Q – 164 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
Ans- Option C
Q – 165 The conductivity of crude oil-water mixture depends on the
A. pH value
B. water percentage
C. temperature
D. all (a), (b) and (c)
Ans- Option D
Q – 166 Smoke point of kerosene is the
A. time after which smoking starts on burning.
B. temperature at which smoking starts.
C. maximum height of flame (in mm) without causing smoking, when burnt in a standard lamp.
D. none of these.
Ans- Option B
Q – 167 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 (a), (b) & (c).
Ans- Option C
Q – 168 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 (a), (b) and (c)
Ans- Option D
Q – 169 Which of the following is not a sulphur compound present in petroleum?
A. Thiophenes
B. Mercaptans
C. Sulphones
D. Pyroles
Ans- Option C
Q – 170 The vacuum maintained in vacuum distillation unit for reduced crude is about __________ mmHg.
A. 1.2
B. 12
C. 120
D. 700
Ans- Option C
Q – 171 A typical yield of kerosene in straight run distillation of crude oil may be about __________ percent.
A. 4
B. 10
C. 18
D. 26
Ans- Option B
Q – 172 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
Ans- Option C
Q – 173 Aniline point of high speed diesel may be about __________ C.
A. 35
B. 70
C. 105
D. 150
Ans- Option B
Q – 174 Which of the following is a non-regenerative fixed bed catalytic reforming process?
A. Hydroforming
B. Thermofer catalytic reforming
C. Platforming
D. Hyperforming
Ans- Option C
Q – 175 Ethyl mercaptan is a/an __________ compound.
A. sulphur
B. nitrogen
C. oxygen
D. none of these
Ans- Option A
Q – 176 Which of the following has the lowest cetane number?
A. Aromatics
B. i-paraffins
C. Naphthene
D. Olefins
E. n-paraffins
Ans- Option A
Q – 177 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.
Ans- Option C
Q – 178 Aniline point is a property of the
A. diesel
B. LPG
C. naphtha
D. gasoline
Ans- Option C
Q – 179 Octane number (unleaded) of reformed gasoline may be upto
A. 60
B. 70
C. 80
D. 90
Ans- Option D
Q – 180 Highest quality bitumen is produced from the __________ crude oil.
A. paraffinic
B. naphthenic
C. intermediate
D. mixed
Ans- Option B
Q – 181 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
Ans- Option B
Q – 182 Pick out the wrong statement.
A. Pensky-Marten apparatus is used for determining flash points above 50C.
B. Characterisation factor of paraffinic crude oil is more than 12.
C. Abel apparatus is used for determining flash points below 50C.
D. An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index.
Ans- Option D
Q – 183 Pressure & temperature maintained in catalytic cracking is about
A. 2atm & 500C
B. 10atm & 500C
C. 30atm & 200C
D. 50atm. & 750C
Ans- Option A
Q – 184 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
Ans- Option A
Q – 185 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.
Ans- Option B
Q – 186 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.
Ans- Option C
Q – 187 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
Ans- Option B
Q – 188 With increase in the molecular weight of aromatic present in kerosene, its smoking tendency
A. increases
B. decreases
C. remains same
D. is unpredictable
Ans- Option A
Q – 189 Lane and Garton classification of petroleum is based on its
A. composition
B. specific gravity
C. optical properties
D. viscosity
Ans- Option B
Q – 190 Carbon percentage (by weight) in crude petroleum may be about
A. 65
B. 75
C. 85
D. 95
Ans- Option C
Q – 191 The main reaction in reforming is the
A. dehydrogenation of naphthenes.
B. hydrogenation of naphthenes.
C. hydrocracking of paraffins.
D. saturation of olefins.
Ans- Option A
Q – 192 Gasoline yield in catalytic reforming of naphtha may be about __________ percent by weight.
A. 85
B. 65
C. 50
D. 98
Ans- Option A
Q – 193 Higher pressure in the reforming reactor
A. increases coke formation.
B. increases the rate of reaction.
C. produces high octane number gasoline.
D. none of these.
Ans- Option D
Q – 194 Which of the following has the minimum API gravity of all?
A. Diesel
B. Kerosene
C. Petrol
D. Furnace oil
Ans- Option D
Q – 195 Which parameter is used for the grading of paraffin waxes?
A. Specific gravity
B. Melting point
C. Viscosity
D. Penetration number
Ans- Option C
Q – 196 Which of the following is the most important property for a jet fuel?
A. Cloud point
B. Pour point
C. Colour
D. Freezing point
Ans- Option D
Q – 197 Feed for reforming is generally
A. naphtha or straight run gasoline.
B. reduced crude.
C. vacuum gas oil.
D. atmospheric gas oil.
Ans- Option A
Q – 198 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
Ans- Option B
Q – 199 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
Ans- Option B
Q – 200 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
Ans- Option C
Q – 201 1 centistoke is equal to __________ Redwood I seconds.
A. 1
B. 4.08
C. 0.408
D. 40.8
Ans- Option B
Q – 202 Thermofer catalytic cracking process is a __________ process.
A. fixed bed
B. moving bed
C. fluidised bed
D. non-catalytic
Ans- Option D
Q – 203 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
Ans- Option B
Q – 204 Cetane number of a diesel fuel is the measure of its
A. ignition delay
B. smoke point
C. viscosity
D. oxidation stability
Ans- Option A
Q – 205 Paraffins are desirable in lubricating oil, as it has got high
A. viscosity
B. viscosity index
C. smoke point
D. pour point
Ans- Option C
Q – 206 The most suitable solvent for deasphalting vacuum residue is
A. propane
B. methyl ethyl ketone
C. doctor’s solution
D. methanol amine
Ans- Option B
Q – 207 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.
Ans- Option B
Q – 208 Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic
A. cracking
B. polymerisation
C. reforming
D. isomerisation
Ans- Option C
Q – 209 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
Ans- Option B
Q – 210 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
Ans- Option B
Q – 211 Good quality kerosene should have
A. low smoke point.
B. high smoke point.
C. high aromatics content.
D. low paraffins content.
Ans- Option B
Q – 212 Antioxidants are added in petrol to
A. impart colour to it, for easy identification.
B. minimise the gum formation.
C. prevent icing of the carburettor.
D. prevent the lead build up in engines.
Ans- Option B
Q – 213 Gasoline extracted from natural gas (by compression and cooling) is called the __________ gasoline.
A. polymer
B. unleaded
C. casing head
D. straight run
Ans- Option B
Q – 214 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
Ans- Option A
Q – 215 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.
Ans- Option B