Petroleum Refinery Engineering Quiz 4

1 / 50

Petroleum _________ ?

Does not contain asphalt

Constitutes mainly of olefins

Does not contain aromatics

Is optically active

2 / 50

Penetration test determines the ______ of the grease?

Stiffness

Variation in viscosity with temperature

Service temperature

Lubricating properties (e.g. oilness)

3 / 50

Pick out the wrong statement ?

An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

Characterisation factor of paraffinic crude oil is more than 12

Abel apparatus is used for determining flash points below 50?C

Pensky-Marten apparatus is used for determining flash points above 50?C

4 / 50

Pick out the wrong statement ?

Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts

All the alkylation processes use very high temperature (> 1000?C)

Gasoline having an octane number of 90 can be produced by alkylation process

Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin

5 / 50

Petroleum coke is used mainly in the ___________ ?

Discoloration of yellow glycerine

Manufacture of carbon electrode

Blast furnace for reduction of iron ore

Sugar refining

6 / 50

Operating temperature and pressure in catalytic reforming is about______?

15-45 Kgf/cm2 & 450-550?C

1-5 Kgf/cm2 & 200?C

50 ? 75 kgf/cm2 & 600 ? 800?C

5-10 kgf/cm2 & 150 ? 250?C

7 / 50

Percentage of straight run gasoline in a typical crude oil may be around_________?

8 / 50

Pick out the correct statement about catalytic polymerisation ?

H2SO4 polymerisation process gives gasoline rich in unsaturates

In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho H3PO4 formation, which are inactive

Both A. and B.

Neither A. nor B.

9 / 50

Olefins are__________?

None of these

Unsaturated cyclic compounds (hydrocarbons)

Saturated hydrocarbons

Present in substantially good quantity in crude petroleum

10 / 50

Reforming___________?

All A., B. and C.

Does not much affect the molecular weight of the feed

Improves the quality & yield of gasoline

Uses naphtha as feedstock

11 / 50

Polymerisation___________?

Causes aromatics to combine with each other

Causes olefins to combine with each other

Produces i-octane from cracked gases containing i-butane and butene

Is aimed at producing lubricating oil

12 / 50

Pyrolysis of kerosene or natural gasoline is done to produce mainly the_____?

Lighter paraffins

Olefins and aromatics

Diesel

Stabilised gasoline

13 / 50

Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about ________ ?C ?

140

14 / 50

Reforming converts__________?

Olefins into paraffins

Naphthenes into olefins

Naphthenes into paraffin

Naphthenes into aromatics

15 / 50

Raw Kerosene has a smoke point of 15 mm. After it is subjected to dearomatization by liquid SO2 extraction (Edeleanu process), its smoke point may become _________ mm?

100

16 / 50

Reid vapour pressure of gasoline is the measure of its__________?

Carbon residue

Cloud point

Vapour locking tendency

Pour point

17 / 50

Quinoline is a/an _________ compound ?

None of these

Sulphur

Oxygen

Nitrogen

18 / 50

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 (e.g., aromatics) possess the maximum thermal energy per unit weight

19 / 50

Platforming is a _____ process?

Non-regenerative & fixed bed

Fluidised bed

Moving bed

Regenerative

20 / 50

Petroleum is believed to have originated from ________ sources?

Vegetable

Animal

Neither A. nor B.

Both A. and B.

21 / 50

Pick out the undesirable property for a solvent meant for dewaxing of lube oil ?

High solubility of wax in the solvent

Both A. and B.

Neither A. nor B.

Complete miscibility with oil

22 / 50

Pick out the wrong statement?

Gross calorific value (GCV) of petrofuels is equal to (12400 ? 2100 ?2) where, ? 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)

Aromatics have higher specific gravity than paraffins

Higher specific gravity of petrofuels means higher C/H ratio

23 / 50

Removal of light fractions from crude oil is called its _______?

Visbreaking

Dehydration

Sweetening

Stabilisation

24 / 50

Pick out the additive property of lube oil out of following ?

Specific gravity

?API gravity

Flashpoint

Viscosity

25 / 50

Research octane number refers to the_____?

High octane number aviation fuels

Low octane number motor fuels

Unleaded motor fuels

High octane number motor fuels

26 / 50

Octane numbers of motor gasoline used in India and America are respectively_________?

83 & 100

87 & 94

94 & 100

94 & 87

27 / 50

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__________?

Both A. & B.

Molecular weight

Neither ?a? nor ?b?

Aromatics content

28 / 50

Pick out the correct statement pertaining to catalytic cracking ?

With increase in the reactor pressure, octane number of gasoline decreases

Percentage conversion increases with increase in the catalyst to oil ratio

All A., B. and C.

With increase in the reactor temperature, gasoline yield decreases for a given conversion

29 / 50

Pick out the wrong statement?

Multigrade lubricating oils have high viscosity index

Naphthenic oil has very low viscosity index

Paraffinic oil has very high viscosity index

High viscosity index means a large change in viscosity with change in temperature

30 / 50

Paraffin base crude oil as compared to asphalt base crude gives_____?

Higher octane number gasoline

Poorer yield of lube oil

Lower viscosity index lube oil

Higher yield of straight run gasoline

31 / 50

Pick out the correct statement?

Paraffins have lower smoke point than aromatics

Suitability of kerosene as a fuel & as an illuminant may be determined by char value test

Paraffins have higher octane number than corresponding iso-paraffin

Aviation fuel should have very high cloud point

32 / 50

Petroleum liquid fuels having flash point greater than 66?C is considered as safe during storage and handling. Which of the following has flash point > 66?C ?

Kerosene

Petrol

Naphtha

Heavy fuel oil

33 / 50

Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has___________?

Low viscosity index

High pour point and low smoke point

All A., B. and C.

High self-ignition temperature

34 / 50

Operating condition in the electrical dehydrators for crude oil is about______?

50 atm. and 150?C

20 kgf/cm2 & 110?C

1 atm. & 110 ?C

6.5 kgf/Cm2 & 95?C

35 / 50

Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene ?

Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond

Smoking tendency of hydrocarbons increases in the order: paraffins ? isoparaffins ? naphthenes ? aromatics

Smoking tendency of aromatics decreases with increase in its molecular weight

Smoking tendency of paraffins increases with decrease in its molecular weight

36 / 50

Performance number of a liquid fuel is related to its ___________?

Spontaneous ignition temperature

Sulphur content

Knocking tendency

Wax content

37 / 50

Pressure & temperature maintained in catalytic cracking is about___________?

50 atm & 750?C

2 atm & 500?C

10 atm & 500?C

30 atm & 200?C

38 / 50

Older crude petroleum ___________?

All A., B. and C.

Gives more distillates

Is light and better

Gives less tar

39 / 50

Presence of aromatics in ___________?

Petrol increases its octane number

Diesel increases its cetane number

All A., B. and C.

Kerosene increases its smoke point

40 / 50

Products drawn from the top to bottom of the crude oil distillation column has progressively increasing _____?

All A., B. and C.

Boiling points

Molecular weight

C/H ratio

41 / 50

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

1.5

42 / 50

Pick out the wrong statement?

Pyrolysis is a mild thermal cracking process

Operating pressure and temperature in thermal cracking process is more than that in catalytic cracking process

Higher temperature is employed in visbreaking than in thermal cracking

Lead susceptibility of petrol produced by catalytic process is more than that produced by thermal cracking

43 / 50

Presence of sulphur in gasoline_____?

Leads to corrosion

Helps during stabilisation

Increases lead susceptibility

Decreases gum formation

44 / 50

Pour point and freezing point is equal for___________?

Water

Diesel

Petrol

Crude petroleum

45 / 50

Paraffins are desirable in lubricating oil, as it has got high_______?

Pour point

Smoke point

Viscosity

Viscosity index

46 / 50

Phenols are added in gasoline to______?

Improve the octane number

Increase its pour point

Act as an antioxidant

Reduce its viscosity

47 / 50

Pick out the wrong statement ?

None of these

Iso-paraffin crack faster than n-paraffin.

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

48 / 50

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

Fluorescence of oils helps to detect its adulteration

49 / 50

Pour point of a petrofuel is_________?

5?C below the temperature at which oil ceases to flow

Multiple of 3?F

Multiple of 5?F

None of these

50 / 50

Petrolatum is___________?

Petroleum coke

Same as petroleum ether

None of these

A mixture of microcrystalline wax in viscous hydrocarbon liquids

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