Petroleum Refinery Engineering Quiz 4

1 / 50

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

Diesel

Olefins and aromatics

Lighter paraffins

Stabilised gasoline

2 / 50

Petroleum coke is used mainly in the ___________ ?

Manufacture of carbon electrode

Sugar refining

Blast furnace for reduction of iron ore

Discoloration of yellow glycerine

3 / 50

Penetration test determines the ______ of the grease?

Service temperature

Lubricating properties (e.g. oilness)

Stiffness

Variation in viscosity with temperature

4 / 50

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

Stabilisation

Visbreaking

Dehydration

Sweetening

5 / 50

Polymerisation___________?

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

Is aimed at producing lubricating oil

Causes olefins to combine with each other

Causes aromatics to combine with each other

6 / 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 aromatics decreases with increase in its molecular weight

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

7 / 50

Pick out the wrong statement ?

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

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

8 / 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.

Complete miscibility with oil

Neither A. nor B.

9 / 50

Presence of sulphur in gasoline_____?

Leads to corrosion

Increases lead susceptibility

Decreases gum formation

Helps during stabilisation

10 / 50

Petrolatum is___________?

None of these

Petroleum coke

Same as petroleum ether

A mixture of microcrystalline wax in viscous hydrocarbon liquids

11 / 50

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

Poorer yield of lube oil

Higher yield of straight run gasoline

Higher octane number gasoline

Lower viscosity index lube oil

12 / 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.

13 / 50

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

14 / 50

Reid vapour pressure of gasoline is the measure of its__________?

Pour point

Cloud point

Carbon residue

Vapour locking tendency

15 / 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

Naphtha

Kerosene

Heavy fuel oil

16 / 50

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

94 & 87

87 & 94

94 & 100

83 & 100

17 / 50

Petroleum _________ ?

Does not contain aromatics

Constitutes mainly of olefins

Does not contain asphalt

Is optically active

18 / 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

19 / 50

Reforming converts__________?

Olefins into paraffins

Naphthenes into olefins

Naphthenes into paraffin

Naphthenes into aromatics

20 / 50

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

140

21 / 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

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

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

22 / 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

23 / 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

Neither ?a? nor ?b?

Aromatics content

Both A. & B.

24 / 50

Reforming___________?

Uses naphtha as feedstock

Improves the quality & yield of gasoline

Does not much affect the molecular weight of the feed

All A., B. and C.

25 / 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

26 / 50

Quinoline is a/an _________ compound ?

None of these

Nitrogen

Oxygen

Sulphur

27 / 50

Research octane number refers to the_____?

High octane number motor fuels

Low octane number motor fuels

High octane number aviation fuels

Unleaded motor fuels

28 / 50

Olefins are__________?

Saturated hydrocarbons

Unsaturated cyclic compounds (hydrocarbons)

Present in substantially good quantity in crude petroleum

None of these

29 / 50

Pick out the correct statement about catalytic polymerisation ?

Neither A. nor B.

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

30 / 50

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

Viscosity index

Viscosity

Pour point

Smoke point

31 / 50

Pick out the wrong statement?

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

Paraffinic oil has very high viscosity index

Multigrade lubricating oils have high viscosity index

Naphthenic oil has very low viscosity index

32 / 50

Pick out the wrong statement?

Pyrolysis is a mild thermal cracking process

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

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

33 / 50

Pick out the wrong statement ?

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

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

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

34 / 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

35 / 50

Presence of aromatics in ___________?

Petrol increases its octane number

Kerosene increases its smoke point

All A., B. and C.

Diesel increases its cetane number

36 / 50

Phenols are added in gasoline to______?

Increase its pour point

Act as an antioxidant

Improve the octane number

Reduce its viscosity

37 / 50

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

Flashpoint

Specific gravity

?API gravity

Viscosity

38 / 50

Pressure & temperature maintained in catalytic cracking is about___________?

50 atm & 750?C

30 atm & 200?C

2 atm & 500?C

10 atm & 500?C

39 / 50

Pick out the correct statement?

Aviation fuel should have very high cloud point

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

Paraffins have lower smoke point than aromatics

Paraffins have higher octane number than corresponding iso-paraffin

40 / 50

Petroleum is believed to have originated from ________ sources?

Neither A. nor B.

Both A. and B.

Vegetable

Animal

41 / 50

Pick out the wrong statement ?

A pale color of petroleum product indicates lower viscosity

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

Color of petroleum products indicates the degree of refinement

Fluorescence of oils helps to detect its adulteration

42 / 50

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

1.5

43 / 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

44 / 50

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

Spontaneous ignition temperature

Wax content

Sulphur content

Knocking tendency

45 / 50

Platforming is a _____ process?

Moving bed

Fluidised bed

Non-regenerative & fixed bed

Regenerative

46 / 50

Pick out the wrong statement?

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

Higher specific gravity of petrofuels means higher C/H ratio

Aromatics have higher specific gravity than paraffins

47 / 50

Operating temperature and pressure in catalytic reforming is about______?

1-5 Kgf/cm2 & 200?C

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

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

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

48 / 50

Pour point and freezing point is equal for___________?

Petrol

Water

Crude petroleum

Diesel

49 / 50

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

All A., B. and C.

C/H ratio

Boiling points

Molecular weight

50 / 50

Older crude petroleum ___________?

Gives less tar

Is light and better

Gives more distillates

All A., B. and C.

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