Petroleum Refinery Engineering Quiz 4

1 / 50

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

20 kgf/cm2 & 110?C

50 atm. and 150?C

1 atm. & 110 ?C

6.5 kgf/Cm2 & 95?C

2 / 50

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

Higher octane number gasoline

Higher yield of straight run gasoline

Lower viscosity index lube oil

Poorer yield of lube oil

3 / 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

4 / 50

Penetration test determines the ______ of the grease?

Variation in viscosity with temperature

Service temperature

Lubricating properties (e.g. oilness)

Stiffness

5 / 50

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

Dehydration

Stabilisation

Visbreaking

Sweetening

6 / 50

Polymerisation___________?

Causes olefins to combine with each other

Is aimed at producing lubricating oil

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

Causes aromatics to combine with each other

7 / 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

Aromatics content

Neither ?a? nor ?b?

8 / 50

Phenols are added in gasoline to______?

Improve the octane number

Increase its pour point

Reduce its viscosity

Act as an antioxidant

9 / 50

Reforming___________?

Does not much affect the molecular weight of the feed

Improves the quality & yield of gasoline

All A., B. and C.

Uses naphtha as feedstock

10 / 50

Platforming is a _____ process?

Non-regenerative & fixed bed

Fluidised bed

Moving bed

Regenerative

11 / 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

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

All A., B. and C.

12 / 50

Older crude petroleum ___________?

Gives less tar

Is light and better

Gives more distillates

All A., B. and C.

13 / 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 aromatics decreases with increase in its molecular weight

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

Smoking tendency of paraffins increases with decrease in its molecular weight

14 / 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

15 / 50

Presence of aromatics in ___________?

Kerosene increases its smoke point

All A., B. and C.

Diesel increases its cetane number

Petrol increases its octane number

16 / 50

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

C/H ratio

All A., B. and C.

Molecular weight

Boiling points

17 / 50

Pick out the wrong statement?

Lead susceptibility 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

Higher temperature is employed in visbreaking than in thermal cracking

Pyrolysis is a mild thermal cracking process

18 / 50

Pick out the wrong statement?

Higher specific gravity of petrofuels means higher C/H ratio

Aromatics have higher specific gravity than paraffins

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

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

19 / 50

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

Wax content

Sulphur content

Knocking tendency

Spontaneous ignition temperature

20 / 50

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

140

21 / 50

Reforming converts__________?

Naphthenes into aromatics

Naphthenes into olefins

Naphthenes into paraffin

Olefins into paraffins

22 / 50

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

All A., B. and C.

High self-ignition temperature

High pour point and low smoke point

Low viscosity index

23 / 50

Petroleum _________ ?

Constitutes mainly of olefins

Is optically active

Does not contain asphalt

Does not contain aromatics

24 / 50

Pour point of a petrofuel is_________?

Multiple of 3?F

None of these

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

Multiple of 5?F

25 / 50

Petroleum is believed to have originated from ________ sources?

Vegetable

Neither A. nor B.

Both A. and B.

Animal

26 / 50

Operating temperature and pressure in catalytic reforming is about______?

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

1-5 Kgf/cm2 & 200?C

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

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

27 / 50

Pick out the wrong statement ?

Aromatics have lower specific gravity than corresponding paraffins

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

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

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

28 / 50

Pick out the wrong statement ?

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

None of these

29 / 50

Pick out the correct statement?

Paraffins have higher octane number than corresponding iso-paraffin

Aviation fuel should have very high cloud point

Paraffins have lower smoke point than aromatics

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

30 / 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

31 / 50

Presence of sulphur in gasoline_____?

Leads to corrosion

Helps during stabilisation

Decreases gum formation

Increases lead susceptibility

32 / 50

Pressure & temperature maintained in catalytic cracking is about___________?

10 atm & 500?C

50 atm & 750?C

2 atm & 500?C

30 atm & 200?C

33 / 50

Quinoline is a/an _________ compound ?

None of these

Oxygen

Nitrogen

Sulphur

34 / 50

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

87 & 94

94 & 87

83 & 100

94 & 100

35 / 50

Pick out the wrong statement ?

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

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

Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts

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

36 / 50

Pick out the correct statement about catalytic polymerisation ?

H2SO4 polymerisation process gives gasoline rich in unsaturates

Both A. and B.

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

Neither A. nor B.

37 / 50

Pour point and freezing point is equal for___________?

Crude petroleum

Water

Petrol

Diesel

38 / 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

Heavy fuel oil

Naphtha

39 / 50

Olefins are__________?

Saturated hydrocarbons

None of these

Present in substantially good quantity in crude petroleum

Unsaturated cyclic compounds (hydrocarbons)

40 / 50

Petrolatum is___________?

Same as petroleum ether

None of these

Petroleum coke

A mixture of microcrystalline wax in viscous hydrocarbon liquids

41 / 50

Pick out the wrong statement?

Paraffinic oil has very high viscosity index

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

42 / 50

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

Specific gravity

Flashpoint

Viscosity

?API gravity

43 / 50

Petroleum coke is used mainly in the ___________ ?

Blast furnace for reduction of iron ore

Discoloration of yellow glycerine

Sugar refining

Manufacture of carbon electrode

44 / 50

Reid vapour pressure of gasoline is the measure of its__________?

Cloud point

Vapour locking tendency

Pour point

Carbon residue

45 / 50

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

1.5

46 / 50

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

Viscosity index

Viscosity

Pour point

Smoke point

47 / 50

Research octane number refers to the_____?

High octane number motor fuels

High octane number aviation fuels

Low octane number motor fuels

Unleaded motor fuels

48 / 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

A pale color of petroleum product indicates lower viscosity

Fluorescence of oils helps to detect its adulteration

49 / 50

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

50 / 50

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

Diesel

Olefins and aromatics

Lighter paraffins

Stabilised gasoline

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