Q.1

H/C ratio (by weight) for the same number of carbon atoms is the highest in case of

  • aromatics
  • paraffins
  • olefins
  • naphthenes
Q.2

Octane number of n-heptane is assumed to be

  • 100
  • 0
  • 70
  • ∞
Q.3

In catalytic cracking, the

  • gasoline obtained has a very low octane number.
  • pressure & temperature is very high.
  • gasoline obtained has very high aromatic content.
  • gasoline obtained has very high amount of gum forming compounds.
Q.4

Deoiling is the process of removal of oil from wax. It is done by the __________ process.

  • solvent extraction
  • sweating
  • resettling
  • all (a), (b) & (c)
Q.5

Which of the following is the easiest to crack?

  • Paraffins
  • Olefins
  • Naphthenes
  • Aromatics
Q.6

Isomerisation converts the __________ tot-paraffins.

  • paraffins
  • olefins
  • naphthenes
  • none of these
Q.7

A petroleum well is called 'dry', if it contains

  • very little oil.
  • no natural gas.
  • only natural gas.
  • all (a), (b) and (c).
Q.8

Penetration test determines the __________ of the grease.

  • stiffness
  • lubricating properties (e.g. oilness)
  • service temperature
  • variation in viscosity with temperature
Q.9

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.10

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.11

Which is almost absent in crude petroleum?

  • Olefins
  • Mercaptans
  • Naphthenes
  • Cycloparaffins
Q.12

Removal of light fractions from crude oil is called its

  • sweetening
  • dehydration
  • stabilisation
  • visbreaking
Q.13

The doctor's solution comprises of sodium plumbite in

  • alcohal
  • water
  • aqueous caustic soda
  • soda ash
Q.14

Carbon/hydrogen ratio (by weight) is maximum (out of following) for

  • gasoline
  • kerosene
  • light gas oil
  • heavy fuel oil
Q.15

Main boring diameter for petroleum well is 20-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.16

Liquefied Petroleum Gas (LPG) in domestic use cylinders is in the liquid form. The density of LPG in liquid form is about __________ of that of water (i.e. 1 gm/c.c).

  • one fourth
  • one third
  • half
  • one eighth
Q.17

Which of the following has the lowest flash point of all?

  • Diesel
  • Kerosene
  • Petrol
  • Furnace oil
Q.18

The characterisation factor of a crude oil is calculated as 12.It means that; it is

  • paraffinic
  • naphthenic
  • intermediate
  • none of these
Q.19

Which of the following theories of origin of petroleum does not explain the presence of nitrogen & sulphur compounds in crude oil?

  • Modern theory
  • Carbide theory
  • Engler theory
  • all (a), (b) and (c)
Q.20

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.21

LPG stands for

  • liquid petroleum gas
  • liquified petrol gas
  • liquid petrol gas
  • liquefied petroleum gas
Q.22

"Breathing loss" on storage of gasoline occurs due to the

  • presence of unsaturated air.
  • fluctuation of ambient temperature during day and night.
  • both (a) and (b).
  • neither (a) nor (b).
Q.23

Smoke volatility index is equal to smoke point plus

  • 0.42 x(% distilled at 204°C)
  • 5 mm
  • 0.84 x (% distilled at 204°C)
  • 10 mm. approximately
Q.24

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.25

Flash point of a liquid petroleum fuel gives an idea about its

  • volatility.
  • explosion hazards characteristics.
  • nature of boiling point diagram.
  • all (a), (b) and (c)
Q.26

Clay treatment of petroleum products

  • decolorises & stabilises cracked gasoline.
  • desulphurise straight run gasoline & kerosene.
  • adsorb arsenic from feedstock to catalytic reforming.
  • all (a), (b) & (c).
Q.27

Pyrolysis of kerosene or natural gasoline is done to produce mainly the

  • olefins and aromatics
  • lighter paraffins
  • stabilised gasoline
  • diesel
Q.28

Straight run petrol as compared to methyl/ethyl alcohol has

  • lower calorific value.
  • lower octane number.
  • higher specific gravity.
  • higher ignition temperature.
Q.29

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.30

__________ treatment is done for appreciable improvement in viscosity index of lubricating oil.

  • Acid
  • Solvent extraction
  • Alkali
  • Clay
Q.31

Waxy crudes are treated with chemical additives mainly to

  • depress its pour point
  • dissolve wax
  • precipitate wax
  • remove wax
Q.32

Aniline point is the

  • characteristic property of diesel & lubricating oils.
  • measure of aromatic content of oil.
  • both (a) and (b).
  • neither (a) nor (b).
Q.33

Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about __________ kg/cm2 .

  • 1.5
  • 3
  • 6
  • 12
Q.34

The reservoir rock containing petroleum has

  • low porosity
  • high permeability
  • high porosity
  • both (b) and (c)
Q.35

Fuel oil is subjected to visbreaking to reduce its

  • pour point
  • viscosity
  • pressure drop on pumping
  • all (a), (b) and (c)
Q.36

Aniline point test of an oil qualitatively indicates the __________ content of an oil.

  • paraffin
  • olefin
  • aromatic
  • naphthene
Q.37

Which of the following processes in oil refinery does not employ 'cracking' ?

  • Coking
  • Visbreaking
  • Pyrolysis
  • None of these
Q.38

Sweetening of petroleum product means the removal of

  • sulphur & its compounds
  • water
  • organic impurities
  • wax
Q.39

Naphthenic acid is a/an __________ compound.

  • sulphur
  • nitrogen
  • oxygen
  • none of these
Q.40

Pick out the wrong statement.

  • Lower boiling paraffins have higher octane number than higher paraffins.
  • Dehydrogenation of naphthenes to aromatics is a desirable reaction in reforming process.
  • The most ideal feedstock for thermal reforming is dearomatised kerosene.
  • Catalyst used in catalytic reforming is platinum on silica-alumina base.
Q.41

Liquefied petroleum Gas (LPG) used for the household cooking comprises mainly of

  • propane & butane
  • butane & ethane
  • methane & ethane
  • methane & carbon monoxide
Q.42

The catalytic cracking of heavier petroleum fraction is done to produce mainly

  • gasoline
  • asphalt
  • diesel oil
  • tar
Q.43

Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about __________ ppm.

  • 1
  • 50
  • 5000
  • 10000
Q.44

CnH2n is the general formula for

  • olefins
  • naphthenes
  • both (a) and (b)
  • neither (a) nor (b)
Q.45

Cetane number of high speed diesel must be ≥

  • 30
  • 45
  • 75
  • 95
Q.46

Which of the following has the highest octane number ?

  • Aromatics
  • i-paraffins
  • Naphthenes
  • Olefins
  • n-paraffins
Q.47

Higher vapour pressure of gasoline indicates

  • low flash point
  • high breathing loss
  • both (a) and (b)
  • neither (a) nor (b)
Q.48

Which of the following has the minimum °API gravity of all?

  • Diesel
  • Kerosene
  • Petrol
  • Furnace oil
Q.49

Which of the following petroleum products contain minimum sulphur ?

  • Naphtha
  • Kerosene
  • LSHS
  • Furnace oil
Q.50

Octane number (unleaded) of reformed gasoline may be upto

  • 60
  • 70
  • 80
  • 90
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