Petroleum Refinery Engineering Quiz 4

1 / 50

Pick out the wrong statement ?

Color of petroleum products indicates the degree of refinement

Fluorescence of oils helps to detect its adulteration

A pale color of petroleum product indicates lower viscosity

Lighter petroleum distillates are lighter in color than the heavier residual oils

2 / 50

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

Flashpoint

Viscosity

?API gravity

Specific gravity

3 / 50

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

C/H ratio

Molecular weight

Boiling points

All A., B. and C.

4 / 50

Reforming___________?

Improves the quality & yield of gasoline

Does not much affect the molecular weight of the feed

Uses naphtha as feedstock

All A., B. and C.

5 / 50

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

6 / 50

Pick out the wrong statement?

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

Multigrade lubricating oils have high viscosity index

7 / 50

Platforming is a _____ process?

Moving bed

Non-regenerative & fixed bed

Regenerative

Fluidised bed

8 / 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

9 / 50

Pour point of a petrofuel is_________?

None of these

Multiple of 5?F

Multiple of 3?F

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

10 / 50

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

Poorer yield of lube oil

Higher octane number gasoline

Higher yield of straight run gasoline

Lower viscosity index lube oil

11 / 50

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

1.5

12 / 50

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

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

Smoking tendency of paraffins increases with decrease in its molecular weight

13 / 50

Phenols are added in gasoline to______?

Increase its pour point

Improve the octane number

Reduce its viscosity

Act as an antioxidant

14 / 50

Petroleum coke is used mainly in the ___________ ?

Manufacture of carbon electrode

Sugar refining

Discoloration of yellow glycerine

Blast furnace for reduction of iron ore

15 / 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

Low viscosity index

High pour point and low smoke point

16 / 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)

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

17 / 50

Petroleum is believed to have originated from ________ sources?

Neither A. nor B.

Animal

Vegetable

Both A. and B.

18 / 50

Polymerisation___________?

Causes olefins to combine with each other

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

Causes aromatics to combine with each other

Is aimed at producing lubricating oil

19 / 50

Presence of aromatics in ___________?

Diesel increases its cetane number

Kerosene increases its smoke point

All A., B. and C.

Petrol increases its octane number

20 / 50

Pick out the correct statement pertaining to catalytic cracking ?

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

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

21 / 50

Pick out the wrong statement ?

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

None of these

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

Iso-paraffin crack faster than n-paraffin.

22 / 50

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

Lighter paraffins

Olefins and aromatics

Stabilised gasoline

Diesel

23 / 50

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

Knocking tendency

Sulphur content

Spontaneous ignition temperature

Wax content

24 / 50

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

140

25 / 50

Pick out the wrong statement?

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)

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

Aromatics have higher specific gravity than paraffins

26 / 50

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

Pour point

Smoke point

Viscosity index

Viscosity

27 / 50

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

Neither A. nor B.

Complete miscibility with oil

High solubility of wax in the solvent

Both A. and B.

28 / 50

Petrolatum is___________?

A mixture of microcrystalline wax in viscous hydrocarbon liquids

Same as petroleum ether

None of these

Petroleum coke

29 / 50

Penetration test determines the ______ of the grease?

Variation in viscosity with temperature

Service temperature

Stiffness

Lubricating properties (e.g. oilness)

30 / 50

Research octane number refers to the_____?

Unleaded motor fuels

Low octane number motor fuels

High octane number motor fuels

High octane number aviation fuels

31 / 50

Petroleum _________ ?

Does not contain aromatics

Does not contain asphalt

Is optically active

Constitutes mainly of olefins

32 / 50

Older crude petroleum ___________?

Gives less tar

Gives more distillates

Is light and better

All A., B. and C.

33 / 50

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

Visbreaking

Sweetening

Stabilisation

Dehydration

34 / 50

Pour point and freezing point is equal for___________?

Diesel

Petrol

Crude petroleum

Water

35 / 50

Pick out the wrong statement?

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

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

Pyrolysis is a mild thermal cracking process

36 / 50

Reid vapour pressure of gasoline is the measure of its__________?

Cloud point

Carbon residue

Vapour locking tendency

Pour point

37 / 50

Pressure & temperature maintained in catalytic cracking is about___________?

2 atm & 500?C

50 atm & 750?C

30 atm & 200?C

10 atm & 500?C

38 / 50

Presence of sulphur in gasoline_____?

Increases lead susceptibility

Decreases gum formation

Leads to corrosion

Helps during stabilisation

39 / 50

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

94 & 100

83 & 100

87 & 94

94 & 87

40 / 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

41 / 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

42 / 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?

43 / 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 ?

Heavy fuel oil

Kerosene

Naphtha

Petrol

44 / 50

Pick out the correct statement?

Paraffins have higher octane number than corresponding iso-paraffin

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

Aviation fuel should have very high cloud point

Paraffins have lower smoke point than aromatics

45 / 50

Pick out the correct statement about catalytic polymerisation ?

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.

H2SO4 polymerisation process gives gasoline rich in unsaturates

46 / 50

Olefins are__________?

None of these

Present in substantially good quantity in crude petroleum

Unsaturated cyclic compounds (hydrocarbons)

Saturated hydrocarbons

47 / 50

Reforming converts__________?

Olefins into paraffins

Naphthenes into olefins

Naphthenes into aromatics

Naphthenes into paraffin

48 / 50

Quinoline is a/an _________ compound ?

Oxygen

None of these

Nitrogen

Sulphur

49 / 50

Operating temperature and pressure in catalytic reforming is about______?

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

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

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

1-5 Kgf/cm2 & 200?C

50 / 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

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