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Chemical Engineering
Petroleum Refinery Engineering
Quiz 1
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Q.1
A typical yield of diesel in straight run distillation of crude oil may be about __________ percent.
8
18
28
35
Q.2
A typical yield of kerosene in straight run distillation of crude oil may be about __________ percent.
4
10
18
26
Q.3
Pick out the wrong statement.
Iso-paraffin crack faster than n-paraf-fin
Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic
Rate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking
None of these
Q.4
Percentage of straight run gasoline in a typical crude oil may be around
6
18
38
52
Q.5
A petroleum well is called 'dry', if it contains
Very little oil
No natural gas
Only natural gas
All of the above
Q.6
Testing of the knocking characteristics of petrofuels is done in a __________ engine.
Carnot
CFR (Co-operative fuel research)
Stirling
Diesel
Q.7
Removal of light fractions from crude oil is called its
Sweetening
Dehydration
Stabilisation
Visbreaking
Q.8
Naphtha yield in straight run distillation of crude oil may be about __________ percent.
2
6
12
18
Q.9
Which of the following processes in oil refinery does not employ 'cracking'?
Coking
Visbreaking
Pyrolysis
None of these
Q.10
Most widely used solvent for dewaxing is
Methyl-ethyl-ketone (MEK)
Naphtha
Petroleum ether
Sodium plumbite
Q.11
Crude oil is pumped by a __________ pump.
Gear
Centrifugal
Screw
Reciprocating
Q.12
Cetane number of a diesel fuel is the measure of its
Ignition delay
Smoke point
Viscosity
Oxidation stability
Q.13
Platforming is a __________ process.
Moving bed
Fluidised bed
Non-regenerative & fixed bed
Regenerative
Q.14
The vacuum maintained in vacuum distillation unit for reduced crude is about __________ mmHg.
1.2
12
120
700
Q.15
Presence of sulphur in gasoline
Leads to corrosion
Increases lead susceptibility
Decreases gum formation
Helps during stabilisation
Q.16
Which of the following constituents present in petroleum is responsible for ash formation?
Nitrogen compounds
Organometallic compounds
Sulphur compounds
Oxygen compounds
Q.17
The most important property for a jet fuel is its
Viscosity
Freezing point
Calorific value
Flash point
Q.18
Mercaptans are added to liquefied petroleum gas (LPG) to
Reduce its cost
Narrow down its explosion limit
Assist in checking its leakage from cylinder
Increase its calorific value
Q.19
Clay treatment of petroleum products
Decolorises & stabilises cracked gasoline
Desulphurise straight run gasoline & kerosene
Adsorb arsenic from feedstock to catalytic reforming
All of the above
Q.20
Which one is preferred for aircraft engine?
High viscosity index lube oil
Low viscosity index lube oil
High freezing point aviation fuel
None of these
Q.21
Reforming
Uses naphtha as feedstock
Does not much affect the molecular weight of the feed
Improves the quality & yield of gasoline
All of the above
Q.22
Liquefied Petroleum Gas (LPG) is mainly a mixture of
Propane & butane
Methane & ethane
High boiling olefins
High boiling naphthenes
Q.23
LSHS is a type of furnace oil, which
Is more viscous than high viscosity furnace oil (HVFO)
Stands for low sulphur heavy stock
Is an ideal fuel for metallurgical furnaces due to its lower sulphur content (< 1%)
All of the above
Q.24
__________ base crude oil is also called asphaltic crude.
Paraffinic
Naphthenic
Mixed
Aromatic
Q.25
Higher viscosity of lubricating oil usually signifies
Lower Reid vapour pressure
Higher acid number
Higher flash point and fire point
Lower flash point and fire point
Q.26
The most widely used crude topping column in refineries is the __________ column.
Bubble-cap
Packed bed
Fluidised bed
Perforated plate
Q.27
Which of the following factors does not govern the mechanism of petroleum formation from organic sources?
PH of the soil
Bacterial action
Heat
Pressure
Q.28
Solution used in Doctor's treatment for the removal of mercaptans is
Sodium hydroxide
Sodium plumbite
Cupric chloride
Potassium isobutyrate
Q.29
Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene.
Smoking tendency of hydrocarbons increases in the order : paraffins → isoparaffins → naphthenes → aromatics
Smoking tendency of paraffins increases with decrease in its molecular weight
Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond
Smoking tendency of aromatics decreases with increase in its molecular weight
Q.30
Name the endothermic reaction out of the following:
Catalytic cracking
Hydrocracking
Dehydrogeneration of naphthene to produce aromatic
Catalytic polymerisation
Q.31
Reforming converts
Olefins into paraffins
Naphthenes into aromatics
Naphthenes into olefins
Naphthenes into paraffin
Q.32
Crude oils containing more than __________ kg of total salts (expressed in terms of NaCl) per thousand barrel is called a 'salty crude'.
1
5
15
25
Q.33
Which of the following is the easiest to crack?
Paraffins
Olefins
Naphthenes
Aromatics
Q.34
Olefins are
Saturated hydrocarbons
Unsaturated cyclic compounds (hydrocarbons)
Present in substantially good quantity in crude petroleum
None of these
Q.35
Polymerisation
Produces i-octane from cracked gases containing i-butane and butene
Causes olefins to combine with each other
Causes aromatics to combine with each other
Is aimed at producing lubricating oil
Q.36
Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic
Cracking
Polymerisation
Reforming
Isomerisation
Q.37
Which of the following is not a sulphur compound present in petroleum ?
Thiophenes
Mercaptans
Sulphones
Pyroles
Q.38
The doctor's solution comprises of sodium plumbite in
Alcohal
Water
Aqueous caustic soda
Soda ash
Q.39
Deoiling is the process of removal of oil from wax. It is done by the __________ process.
Solvent extraction
Sweating
Resettling
All of the above
Q.40
Pick out the wrong statement.
Pensky-Marten apparatus is used for determining flash points above 50°C
Characterisation factor of paraffinic crude oil is more than 12
Abel apparatus is used for determining flash points below 50°C
An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index
Q.41
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
α-methyl naphthalene
2-2-4 tri methyl pentane
1, 3 butadiene
Tetra methyl ethylene
Q.42
Which is almost absent in crude petroleum?
Olefins
Mercaptans
Naphthenes
Cycloparaffins
Q.43
Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about __________ mm Hg absolute.
1 to 5
30 to 80
250 to 350
450 to 500
Q.44
Pour point of a petrofuel is
Multiple of 3°F
Multiple of 5°F
5°C below the temperature at which oil ceases to flow
None of these
Q.45
Presence of aromatics in
Diesel increases its cetane number
Kerosene increases its smoke point
Petrol increases its octane number
All of the above
Q.46
Petrolatum is
Same as petroleum ether
Petroleum coke
A mixture of microcrystalline wax in viscous hydrocarbon liquids
None of these
Q.47
Petroleum
Is optically active
Constitutes mainly of olefins
Does not contain asphalt
Does not contain aromatics
Q.48
Pick out the wrong statement.
Multigrade lubricating oils have high viscosity index
Paraffinic oil has very high viscosity index
Naphthenic oil has very low viscosity index
High viscosity index means a large change in viscosity with change in temperature
Q.49
True boiling point apparatus is used for the
Determination of characterisation factor
Evaluation of oil stocks
Determination of true vapour pressure
None of these
Q.50
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.
5
10
25
100
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