Petroleum Refinery Engineering Quiz 4

1 / 50

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

Flashpoint

Viscosity

Specific gravity

?API gravity

2 / 50

Research octane number refers to the_____?

High octane number motor fuels

Unleaded motor fuels

Low octane number motor fuels

High octane number aviation fuels

3 / 50

Pick out the correct statement about catalytic polymerisation ?

H2SO4 polymerisation process gives gasoline rich in unsaturates

Neither A. nor B.

Both A. and B.

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

4 / 50

Reforming converts__________?

Naphthenes into paraffin

Naphthenes into olefins

Olefins into paraffins

Naphthenes into aromatics

5 / 50

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

Spontaneous ignition temperature

Knocking tendency

Sulphur content

Wax content

6 / 50

Pour point of a petrofuel is_________?

Multiple of 5?F

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

Multiple of 3?F

None of these

7 / 50

Older crude petroleum ___________?

Gives less tar

Gives more distillates

Is light and better

All A., B. and C.

8 / 50

Polymerisation___________?

Causes aromatics to combine with each other

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

Causes olefins to combine with each other

Is aimed at producing lubricating oil

9 / 50

Pick out the wrong statement?

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

Higher temperature is employed in visbreaking than in thermal cracking

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

Pyrolysis is a mild thermal cracking process

10 / 50

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

6.5 kgf/Cm2 & 95?C

50 atm. and 150?C

20 kgf/cm2 & 110?C

1 atm. & 110 ?C

11 / 50

Pick out the wrong statement?

Aromatics have higher specific gravity than paraffins

Gross calorific value (GCV) of petrofuels is equal to (12400 ? 2100 ?2) where, ? is the specific gravity of the fuel at 15.5?C

Higher specific gravity of petrofuels means higher C/H ratio

Heavier petrofuels have higher GCV on weight basis (i.e., Kcal/kg) but lower GCV on volume basis (i.e., Kcal/litre)

12 / 50

Pick out the wrong statement ?

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

A pale color of petroleum product indicates lower viscosity

13 / 50

Pick out the wrong statement ?

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

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

Characterisation factor of paraffinic crude oil is more than 12

14 / 50

Petroleum coke is used mainly in the ___________ ?

Manufacture of carbon electrode

Discoloration of yellow glycerine

Sugar refining

Blast furnace for reduction of iron ore

15 / 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

16 / 50

Presence of sulphur in gasoline_____?

Helps during stabilisation

Decreases gum formation

Increases lead susceptibility

Leads to corrosion

17 / 50

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

High self-ignition temperature

All A., B. and C.

Low viscosity index

High pour point and low smoke point

18 / 50

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

Complete miscibility with oil

Both A. and B.

Neither A. nor B.

High solubility of wax in the solvent

19 / 50

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

C/H ratio

Molecular weight

All A., B. and C.

Boiling points

20 / 50

Pick out the correct statement pertaining to catalytic cracking ?

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

Percentage conversion increases with increase in the catalyst to oil ratio

All A., B. and C.

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

21 / 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

22 / 50

Petroleum _________ ?

Does not contain asphalt

Does not contain aromatics

Is optically active

Constitutes mainly of olefins

23 / 50

Penetration test determines the ______ of the grease?

Variation in viscosity with temperature

Service temperature

Lubricating properties (e.g. oilness)

Stiffness

24 / 50

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

25 / 50

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

1.5

26 / 50

Presence of aromatics in ___________?

Kerosene increases its smoke point

Petrol increases its octane number

Diesel increases its cetane number

All A., B. and C.

27 / 50

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

Stabilisation

Visbreaking

Sweetening

Dehydration

28 / 50

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

140

29 / 50

Quinoline is a/an _________ compound ?

Sulphur

Oxygen

None of these

Nitrogen

30 / 50

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

94 & 87

83 & 100

94 & 100

87 & 94

31 / 50

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

Smoke point

Pour point

Viscosity

Viscosity index

32 / 50

Reforming___________?

Does not much affect the molecular weight of the feed

Improves the quality & yield of gasoline

Uses naphtha as feedstock

All A., B. and C.

33 / 50

Operating temperature and pressure in catalytic reforming is about______?

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

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

1-5 Kgf/cm2 & 200?C

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

34 / 50

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

Higher octane number gasoline

Lower viscosity index lube oil

Higher yield of straight run gasoline

Poorer yield of lube oil

35 / 50

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

Stabilised gasoline

Diesel

Lighter paraffins

Olefins and aromatics

36 / 50

Olefins are__________?

Unsaturated cyclic compounds (hydrocarbons)

Saturated hydrocarbons

Present in substantially good quantity in crude petroleum

None of these

37 / 50

Pick out the wrong statement ?

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

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

Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts

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

38 / 50

Phenols are added in gasoline to______?

Reduce its viscosity

Increase its pour point

Improve the octane number

Act as an antioxidant

39 / 50

Pick out the wrong statement?

Naphthenic oil has very low viscosity index

Multigrade lubricating oils have high viscosity index

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

Paraffinic oil has very high viscosity index

40 / 50

Pick out the wrong statement ?

Aromatics have lower specific gravity than corresponding paraffins

Higher specific gravity of petroleum products means higher C/H ratio

Hydrocarbons of high specific gravity (e.g., aromatics) possess the maximum thermal energy per unit weight

Hydrocarbons of low specific gravity (e.g., paraffins) possess the maximum thermal energy per unit volume

41 / 50

Reid vapour pressure of gasoline is the measure of its__________?

Vapour locking tendency

Cloud point

Carbon residue

Pour point

42 / 50

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

43 / 50

Pick out the wrong statement ?

Rate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking

Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic

Iso-paraffin crack faster than n-paraffin.

None of these

44 / 50

Pressure & temperature maintained in catalytic cracking is about___________?

2 atm & 500?C

10 atm & 500?C

30 atm & 200?C

50 atm & 750?C

45 / 50

Pour point and freezing point is equal for___________?

Crude petroleum

Water

Petrol

Diesel

46 / 50

Petroleum is believed to have originated from ________ sources?

Animal

Vegetable

Neither A. nor B.

Both A. and B.

47 / 50

Petrolatum is___________?

Same as petroleum ether

None of these

A mixture of microcrystalline wax in viscous hydrocarbon liquids

Petroleum coke

48 / 50

Platforming is a _____ process?

Non-regenerative & fixed bed

Regenerative

Fluidised bed

Moving bed

49 / 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__________?

Molecular weight

Aromatics content

Neither ?a? nor ?b?

Both A. & B.

50 / 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 ?

Petrol

Heavy fuel oil

Naphtha

Kerosene

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