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Petroleum Refinery Engineering
Quiz 6
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Q.1
__________ determination is not a very significant and important test for gasoline.
Gum & sulphur content
Viscosity
Octane number
Reid vapor pressure
Q.2
Good quality kerosene should have
Low smoke point
High smoke point
High aromatics content
Low paraffins content
Q.3
Diesel index is defined as
(°API) x (Aniline Point, °F)/100
(°API) x (Aniline Point, °C)/100
(°API) x (100)/Aniline Point, °F
(°API) x (100)/Aniline Point, °C
Q.4
Furfural solvent extraction is used for upgrading (by dissolving aromatics)
Naphtha
Lubricating oils
Wax
Cracking feedstock
Q.5
Which of the following has the minimum °API gravity of all?
Diesel
Kerosene
Petrol
Furnace oil
Q.6
Catalyst used in the catalytic cracking is
Silica-alumina
Silica gel
Vanadium pentoxide
Nickel
Q.7
Naphthenic acid is a/an __________ compound.
Sulphur
Nitrogen
Oxygen
None of these
Q.8
Pick out the wrong statement.
Higher specific gravity of petroleum products means higher C/H ratio
Aromatics have lower specific gravity than corresponding paraffins
Hydrocarbons of low specific gravity (e.g, paraffins) possess the maximum thermal energy per unit volume
Hydrocarbons of high specific gravity (eg, aromatics) possess the maximum thermal energy per unit weight
Q.9
Crude oil is transported inland from oil field to refineries, mainly by the
Road tankers
Rail tankers
Underground pipelines
None of these
Q.10
Fuel oil is subjected to visbreaking to reduce its
Pour point
Viscosity
Pressure drop on pumping
All of the above
Q.11
Dearomatisation of kerosene (by liquid sulphur dioxide extraction) is done to
Increase its smoke point
Improve its oxidation stability
Decrease the breathing loss
None of these
Q.12
Cetane number of diesel used in trucks may be about
50
14
35
85
Q.13
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
Thermal cracking
Gum formation
Coking
Discoloration
Q.14
Maximum sulphur percentage in low sulphur heavy stock (LSHS) furnace oil is about
0.1
1
2.5
3.5
Q.15
Which one is used to determine the colour of petroleum products?
Colour comparator
Saybolt chromometer
Cleveland apparatus
None of these
Q.16
Cracking is
An exothermic reaction
An endothermic reaction
Favoured at very low temperature
None of these
Q.17
Carbon/hydrogen ratio (by weight) is maximum (out of following) for
Gasoline
Kerosene
Light gas oil
Heavy fuel oil
Q.18
The most suitable solvent for deasphalting vacuum residue is
Propane
Methyl ethyl ketone
Doctor's solution
Methanol amine
Q.19
Doctor's solution used for sweetening of petroleum products is
Sodium plumbite
Sodium sulphite
Sodium thiosulphate
Lead sulphate
Q.20
Phenols are added in gasoline to
Improve the octane number
Act as an antioxidant
Reduce its viscosity
Increase its pour point
Q.21
The best method of determining sulphur in crude oil is by the __________ method.
Kjeldah
Duma
Bomb calorimeter
Junkar's calorimeter
Q.22
Tetra-ethyl lead is added in gasoline to
Increase its smoke point
Reduce gum formation
Reduce the pour point
Increase its octane number
Q.23
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.
Decreases
Increases
Remains unchanged
Decreases linearly
Q.24
Aromatics are desired constituents of
Lubricating oil
Diesel
Kerosene
Petrol
Q.25
Mercaptans are
Low boiling sulphur compounds
Added in LPG cylinders to detect gas leakage by its smell
Undesirable in petrol, as they reduce its octane number
All of the above
Q.26
Crude oil produced by Indian oil fields are predominantly __________ in nature.
Paraffinic
Naphthenic
Asphaltic
Mixed base
Q.27
The octane number of aviation gasoline may be
79
87
97
>100
Q.28
Main boring diameter for petroleum well is 20-30 cms in diameter, while the depth of the oil well may be about __________ kms.
0.1 to 0.5
1.5 to 4.5
7.5 to 12.5
15-20
Q.29
Cetane number of alpha methyl naphthalene is assumed to be
0
100
50
∞
Q.30
Liquefied petroleum Gas (LPG) used for the household cooking comprises mainly of
Propane & butane
Butane & ethane
Methane & ethane
Methane & carbon monoxide
Q.31
Flash point of atmospheric distillation residue is determined by __________ apparates.
Pensky-Martens (closed cup type)
Abel
Cleveland (open cup type)
None of these
Q.32
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.
Unsaturated hydrocarbon content
Calorific value
Quantity of propane
Quantity of butane
Q.33
With increase in density, the viscosity of petroleum products
Increases
Decreases
Remains same
Either A or B
Q.34
Viscosity index of a lubricating oil
Is the measure of its flash point
Is the measure of variation of viscosity with temperature
Should be low
None of these
Q.35
'Solvent naphtha' used mostly as a solvent in paints and perfumery is produced by the __________ of virgin naphtha into small boiling range cuts.
Steam reforming
Distillation
Desulphurisation
None of these
Q.36
Crude oil is subjected to vacuum distillation in the last stage, because
High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose
Lighter/low boiling products are prone to thermal decomposition
High purity products can be obtained thereby
None of these
Q.37
Pick out the wrong statement.
A pale color of petroleum product indicates lower viscosity
Color of petroleum products indicates the degree of refinement
Lighter petroleum distillates are lighter in color than the heavier residual oils
Flouroscene of oils helps to detect its adulteration
Q.38
The most commonly used feed stock for the reforming reactor is
Heavy fuel oil
Residuum
Straight run gasdine
Casing head gasoline
Q.39
Stabilisation of gasoline (petrol) means
Removal of dissolved gases from it
Increasing its oxidation stability
Improving its lead susceptibility
Increasing its vapour pressure
Q.40
Which is the most undesirable component in kerosene?
Aromatics
I-paraffins
N-paraffins
Naphthenes
Q.41
Octane number (unleaded) of gasoline produced by isomerisation of butane may be about
45
55
70
90
Q.42
The average boiling point of aviation turbine fuel is closest to that of
Lubricating oils
LPG
Diesel
Kerosene
Q.43
Aniline point is a property of the
Diesel
LPG
Naphtha
Gasoline
Q.44
Which of the following fractions of a crude oil will have the maximum gravity API (i.e. °API) ?
Diesel
Gasoline
Atmospheric gas oil
Vacuum gas oil
Q.45
The solvent used in Barisol dewaxing process is
Hexane
Furfural
Benzol and ethylene dichloride
Methyl ethyl ketone (MEK)
Q.46
In the atmospheric pressure crude distillation, the content of __________ from lighter fraction to heavier ones.
Sulphur increases
Sulphur decreases
Nitrogen decreases
None of these
Q.47
With increase in the molecular weight of aromatic present in kerosene, its smoking tendency
Increases
Decreases
Remains same
Is unpredictable
Q.48
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
Increase the yield of light distillates
Suppress coke formation
Enhance the octane number of gasoline
Reduce gum content in gasoline
Q.49
Which of the following contains maximum sulphur?
Diesel
Petrol
Kerosene
Fuel oil
Q.50
Pressure & temperature maintained in catalytic cracking is about
2atm & 500°C
10atm & 500°C
30atm & 200°C
50atm. & 750°C
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