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Petroleum Refinery Engineering
Quiz 5
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Q.1
Gasoline yield in catalytic reforming of naphtha may be about __________ percent by weight.
85
65
50
98
Q.2
1 centistoke is equal to __________ Redwood I seconds.
1
4.08
0.408
40.8
Q.3
The condesate obtained on compression of wet natural gas is termed as
Liquefied natural gasoline
Natural gasoline
Liquid natural gas
None of these
Q.4
An upper limit of oil content is limited to about __________ percent for achieving efficient and satisfactory level of wax sweating.
5
15
40
60
Q.5
Molecular weight of crude oil is in the range of
100-120
230-250
450-550
600-850
Q.6
Octane number of gasoline is a measure of its
Resistance to knock
Ignition delay
Ignition temperature
Smoke point
Q.7
In petroleum refining, the process used for conversion of hydrocarbons to aromatics is
Catalytic cracking
Catalytic reforming
Hydrotreating
Alkylation
Q.8
The pressure (kg/cm² ) and temperature (°C) maintained in electrical desalters for crude oil are respectively
10 and 120
1 and 200
50 and 250
10 and 300
Q.9
Which of the following has the highest gum forming tendency in gosoline?
Paraffins
Diolefins
Aromatics
Naphthenes
Q.10
Highest quality bitumen is produced from the __________ crude oil.
Paraffinic
Naphthenic
Intermediate
Mixed
Q.11
Illuminating characteristics of kerosene is expressed by its
Smoke point
Aniline point
Luminosity number
Aromatic content
Q.12
Increase in the specific gravity of petroleum products indicates
Decrease in paraffin content
Increase in thermal energy per unit weight
Increase in aromatic content
Higher H/C ratio
Q.13
__________ chloride present in crude petroleum as impurity is the most prolific producer of HCl during distillation.
Magnesium
Potassium
Calcium
Sodium
Q.14
Crude topping column operates at __________ pressure.
Atmospheric
10 atm
Vacuum
3 atm
Q.15
Feedstock for polymerisation is
Naphtha
Cracked gases rich in C₂ & C₄ olefins
Low boiling aromatics
None of these
Q.16
The first crude oil refinery of India is located at
Naharkatiya
Digboi
Kochin
Madras
Q.17
Mercaptans is represented as (where R and R' are alkyl groups)
R-COOH
R-S-H
R-S-R
R-S-R'
Q.18
Which of the following is not an important property of fuel oil/furnace oil?
Sulphur content
Viscosity
Aniline point
Flash point
Q.19
Maximum viscosity of tar/PCM/fuel oil for easy and efficient atomisation in conventional burner is __________ centistokes (or 100 Redwood I seconds).
5
25
50
100
Q.20
High aniline point of a petrofuel (say diesel) indicates that
It is highly aromatic in nature
It is highly paraffinic in nature
It has a very low diesel index
Its ignition quality is very poor
Q.21
Aniline point of high speed diesel may be about __________ °C.
35
70
105
150
Q.22
LPG when brought to atmospheric pressure & temperature will be a
Liquid lighter than water
Liquid heavier than water
Gas lighter than air
Gas heavier than air
Q.23
Water separometer index (modified) (WSIM) of a petrofuel is the measure of its
Emulsification tendency
Water separation characteristics
Water content
Water absorbing capacity from atmosphere
Q.24
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
Intermediate distillates
Heavy distillates
Light ends
Residues
Q.25
Pick out the wrong statement.
Higher temperature is employed in visbreaking than in thermal cracking
Pyrolysis is a mild thermal cracking process
Lead suceptibility of petrol produced by catalytic process is more than that produced by thermal cracking
Operating pressure and temperature in thermal cracking process is more than that in catalytic cracking process
Q.26
Catalyst used in isomerisation process is
H₂SO₄
H₃PO₄
HF
AlCl3
Q.27
Name the hydrocarbon having the poorest oxidation stability.
Naphthene
Olefin
Paraffin
Aromatics
Q.28
Which of the following fractions of petroleum contains maximum sulphur?
Diesel
Gasoline
Naphtha
Atmospheric residue
Q.29
Pick out the additive property of a lube oil out of following.
°API gravity
Specific gravity
Viscosity
Flashpoint
Q.30
Pick out the wrong statement.
Aromatics have higher specific gravity than paraffins
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
Heavier petrofuels have higher GCV on weight basis (i.e., Kcal/kg) but lower GCV on volume basis (i.e., Kcal/litre)
Higher specific gravity of petrofuels means higher C/H ratio
Q.31
Paraffin base crude oil as compared to asphalt base crude gives
Higher yield of straight run gasoline
Higher octane number gasoline
Lower viscosity index lube oil
Poorer yield of lube oil
Q.32
Straight run petrol as compared to methyl/ethyl alcohol has
Lower calorific value
Lower octane number
Higher specific gravity
Higher ignition temperature
Q.33
Feed for reforming is generally
Naphtha or straight run gasoline
Reduced crude
Vacuum gas oil
Atmospheric gas oil
Q.34
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.
600-750
250-350
1000-1500
2000-2500
Q.35
Methyl tertiary butyl ether (MTBE), a high octane (octane no. = 115) gasoline blending component is produced by the simple additive reaction of isobutylene with
Methyl alcohol
Ethyl alcohol
Methane
Ethane
Q.36
Catalytic desulphurisation process used for sweetening of straight run gasoline and kerosene uses __________ as catalyst.
Bauxite
Fuller's earth
Activated clay
All of the above
Q.37
Quinoline is a/an __________ compound.
Sulphur
Nitrogen
Oxygen
None of these
Q.38
Which of the following has the maximum °API gravity of all?
Diesel
Kerosene
Petrol
Furnace oil
Q.39
Which of the following is used as a catalyst in fluidised bed catalytic cracking?
Silica-magnesia
Silica-alumina
Bentonite clays
All of the above
Q.40
Operating condition in the electrical dehydrators for crude oil is about
6.5 kgf/Cm² & 95°C
1 atm. & 110 °C
20 kgf/cm² & 110°C
50 atm. and 150°C
Q.41
Flash point of diesel/kerosene (>50°C) is determined by the
Abel apparatus
Pensky-Martens apparatus
Saybolt chromometer
None of these
Q.42
Pick out the undesirable property for a solvent meant for dewaxing of lube oil.
Complete miscibility with oil
High solubility of wax in the solvent
Both A & B
Neither A nor B
Q.43
Deoiling of wax is done by its
Heating
Cooling
Solvent extraction
Both B & C
Q.44
The proper arrangement of the petroleum fractions in order of their boiling points is
Lubricating oil > diesel > petrol > LPG
Lubricating oil > petrol > diesel > LPG
Petrol > lubricating oil > diesel > LPG
Petrol > diesel > LPG > lubricating oil
Q.45
Flash point of motor gasoline may be around __________ °C.
10
45
100
150
Q.46
Smoke point of a good burning kerosene may be around __________ mm.
0-5
20-25
60-75
100-120
Q.47
Which of the following has the highest flash point of all?
Diesel
Kerosene
Petrol
Furnace oil
Q.48
Detergent is added as an additive in engine lubricating oil to
Reduce deposit formation
Keep contaminants in suspension
Increase oxidation stability
Prevent rusting
Q.49
Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil
Gives higher yield of petrol
Lower octane number of petrol
Higher sulphur content in the product
Higher gum forming material in petrol
Q.50
The main use of heavy gas oil produced by the vacuum distillation unit is as a
Blending component for kerosene
Blending component for petrol
Feedstock for fluid catalytic cracking unit
None of these
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