Q.1

Deoiling of wax is done by its

  • heating
  • cooling
  • solvent extraction
  • both(b)&(c)
Q.2

Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about __________ °C.

  • 50
  • 70
  • 90
  • 140
Q.3

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.4

The average boiling point of aviation turbine fuel is closest to that of

  • lubricating oils
  • LPG
  • diesel
  • Kerosene
Q.5

Gum formation in stored gasoline is mainly due to the

  • alkylation of unsaturates.
  • presence of sulphur.
  • oxidation & polymerisation of unsaturates.
  • higher aromatic content.
Q.6

Which one is used to determine the colour of petroleum products ?

  • Colour comparator
  • Saybolt chromometer
  • Cleveland apparatus
  • None of these
Q.7

Presence of aromatics in

  • diesel increases its cetane number.
  • kerosene increases its smoke point.
  • petrol increases its octane number.
  • all (a), (b) and (c).
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

Operating temperature and pressure in catalytic reforming is about

  • 1-5 Kgf/cm2 & 200°C.
  • 15-45 Kgf/cm2 & 450-550°C.
  • 50 - 75 kgf/cm2 & 600 - 800°C.
  • 5-10 kgf/cm2 & 150 - 250°C.
Q.10

Catalyst used in the catalytic cracking is

  • silica-alumina
  • silica gel
  • vanadium pentoxide
  • nickel
Q.11

Refractive index of a petrofuel which is the ratio of velocity of light in air to its velocity in the petrofuel gives an indication if its

  • molecular weight
  • aromatics content
  • both a & b
  • neither a nor b
Q.12

Choose the correct statement.

  • Octane number of i-octane is zero.
  • Octane number of paraffins increases with increasing number of carbon atoms.
  • Branched chain paraffins have higher octane number than straight chain paraffins with same number of carbon atoms.
  • The aromatics have lower octane number than naphthenes with same number of carbon atoms.
Q.13

During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 towater) __________ with increase in the amount of water.

  • decreases
  • increases
  • remains unchanged
  • decreases linearly
Q.14

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.15

Electrical desalting of crude oil removes the __________ impurities.

  • oleophilic
  • oleophobic
  • both (a) and (b)
  • neither (a) nor (b)
Q.16

Molecular weight of crude petroleum may be around

  • 50
  • 250
  • 1500
  • 5000
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

Crude oil is transported inland from oil field to refineries, mainly by the

  • road tankers
  • rail tankers
  • underground pipelines
  • none of these
Q.19

Solvent used for dewaxing of petroleum products are

  • furfural
  • methyl ethyl ketone (MEK)
  • propane
  • both(b)&(c)
Q.20

The most commonly used feed stock for the reforming reactor is

  • heavy fuel oil
  • residuum
  • straight run gasoline
  • casing head gasoline
Q.21

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

  • 1
  • 2
  • 3
  • 4
Q.22

Flash point of an oil is determined by the

  • Pensky Martens apparatus.
  • Ramsbottom apparatus.
  • Saybolt viscometer.
  • Conradson apparatus.
Q.23

In hydrofining catalytic desulphurisation process for sweetening of petroleum products, use of hydrogen

  • enhances the desulphurisation process.
  • minimises coke formation.
  • both (a) and (b).
  • neither (a) nor (b).
Q.24

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 (a), (b) and (c).
Q.25

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.26

Choose the correct statement regarding thermal cracking.

  • Moderate changes in operating temperature does not change the depth of cracking.
  • Increased residence time results in the decreased severity of cracking.
  • At low pressure, the yield of lighter hydrocarbons are more.
  • Greater depth of cracking gives lower octane number gasoline.
Q.27

Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-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.28

With increase in density, the viscosity of petroleum products

  • increases
  • decreases
  • remains same
  • either (a) or (b)
Q.29

Specific gravity of a petroleum product gives an indication of its

  • degree of refinement.
  • hydrocarbon content type (aromatic or paraffinic).
  • ease of atomisation.
  • sulphur content.
Q.30

Catalyst used in catalytic polymerisation which produces polymer gasoline is

  • H2SO4
  • H3PO4
  • both (a) and (b)
  • AlCl3
Q.31

Which is the most effective catalyst used in catalytic cracking of petroleum products ?

  • Iron oxide
  • Nickel
  • Vanadium pentoxide
  • Zeolite
Q.32

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.33

Which of the following hydrocarbons of same carbon atoms has minimum smoking tendency ?

  • Paraffins
  • Naphthenes
  • Aromatics
  • Iso-paraffins
Q.34

Doctor's solution used for sweetening of petroleum products is

  • sodium plumbite
  • sodium sulphite
  • sodium thiosulphate
  • lead sulphate
Q.35

The yield of straight run LPG from crude oil is about __________ weight percent.

  • 20-25
  • 1-1.5
  • 10-15
  • 0.1-0.2
Q.36

Hydrofining is the most recent and effective method for the

  • removal of sulphur.
  • improvement of smoke point.
  • reduction of breathing loss.
  • improvement of viscosity index.
Q.37

(by volume) of LPG atmm Hg pressure will evaporate at __________ °C.

  • 2
  • -40
  • 30
  • 55
Q.38

Which of the following is used as a solvent in deasphalting of petroleum products ?

  • Furfural
  • Propane
  • Methyl ethyl ketone
  • Liquid sulphur dioxide
Q.39

Feedstock for the production of biodiesel is

  • herbal plants
  • used vegetable oils
  • LSHS
  • bagasse
Q.40

Which of the following has the highest gum forming tendency in gosoline ?

  • Paraffins
  • Diolefins
  • Aromatics
  • Naphthenes
Q.41

Aniline point is the temperature at which

  • equal weight of diesel & the aniline are completely miscible.
  • equal weight of aniline & the test sample are completely miscible.
  • equal volume of aniline & the test sample are completely miscible.
  • aniline vaporises.
Q.42

A typical yield of diesel in straight run distillation of crude oil may be about __________ percent.

  • 8
  • 18
  • 28
  • 35
Q.43

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.44

Detergent is added as an additive in engine lubricating oil to

  • reduce deposit formation.
  • keep contaminants in suspension.
  • increase oxidation stability.
  • prevent rusting.
Q.45

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.46

Butadiene is a/an

  • di-olefin
  • naphthene
  • aromatic
  • olefin
Q.47

Maximum use of petroleum coke is in

  • adsorption refining operation.
  • fuel gas manufacture.
  • carbon electrode manufacture.
  • iron ore reduction.
Q.48

Solvent deoiling process is used for separating oil and soft wax from hard wax. Methyl iso-butyl ketone and methyl ethyl ketone (MEK) are two commonly used deoiling solvents. Use of former as the deoiling solvent has the advantages of the

  • elimination of solvent drying facility.
  • higher nitration temperature.
  • lower solvent dilution ratio.
  • all (a), (b) & (c).
Q.49

Petroleum is believed to have originated from __________ sources.

  • vegetable
  • animal
  • both (a) and (b)
  • neither (a) nor (b)
Q.50

Smoke point of kerosene expresses its

  • burning characteristics.
  • luminosity characteristics.
  • aromatic content directly.
  • lamp wick wetting characteristics.
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