Petroleum Refinery Engineering Quiz 4

1 / 50

Petroleum is believed to have originated from ________ sources?

Animal

Neither A. nor B.

Both A. and B.

Vegetable

2 / 50

Platforming is a _____ process?

Fluidised bed

Non-regenerative & fixed bed

Regenerative

Moving bed

3 / 50

Petroleum _________ ?

Is optically active

Does not contain asphalt

Constitutes mainly of olefins

Does not contain aromatics

4 / 50

Pick out the wrong statement?

Naphthenic oil has very low viscosity index

Multigrade lubricating oils have high viscosity index

Paraffinic oil has very high viscosity index

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

5 / 50

Pick out the wrong statement ?

None of these

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.

6 / 50

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

Viscosity index

Pour point

Viscosity

Smoke point

7 / 50

Pressure & temperature maintained in catalytic cracking is about___________?

2 atm & 500?C

30 atm & 200?C

10 atm & 500?C

50 atm & 750?C

8 / 50

Pick out the wrong statement ?

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

Color of petroleum products indicates the degree of refinement

9 / 50

Pick out the correct statement about catalytic polymerisation ?

Neither A. nor B.

Both A. and B.

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

10 / 50

Pick out the correct statement?

Paraffins have lower smoke point than aromatics

Paraffins have higher octane number than corresponding iso-paraffin

Aviation fuel should have very high cloud point

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

11 / 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

12 / 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__________?

Neither ?a? nor ?b?

Both A. & B.

Molecular weight

Aromatics content

13 / 50

Polymerisation___________?

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

Causes olefins to combine with each other

Is aimed at producing lubricating oil

Causes aromatics to combine with each other

14 / 50

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

Stabilised gasoline

Olefins and aromatics

Lighter paraffins

Diesel

15 / 50

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

Molecular weight

All A., B. and C.

C/H ratio

Boiling points

16 / 50

Olefins are__________?

None of these

Present in substantially good quantity in crude petroleum

Unsaturated cyclic compounds (hydrocarbons)

Saturated hydrocarbons

17 / 50

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

140

18 / 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

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)

Higher specific gravity of petrofuels means higher C/H ratio

19 / 50

Quinoline is a/an _________ compound ?

Sulphur

Oxygen

Nitrogen

None of these

20 / 50

Pour point and freezing point is equal for___________?

Crude petroleum

Water

Petrol

Diesel

21 / 50

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

20 kgf/cm2 & 110?C

6.5 kgf/Cm2 & 95?C

1 atm. & 110 ?C

50 atm. and 150?C

22 / 50

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

23 / 50

Petrolatum is___________?

Same as petroleum ether

A mixture of microcrystalline wax in viscous hydrocarbon liquids

Petroleum coke

None of these

24 / 50

Pick out the correct statement pertaining to catalytic cracking ?

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

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.

25 / 50

Petroleum coke is used mainly in the ___________ ?

Blast furnace for reduction of iron ore

Manufacture of carbon electrode

Discoloration of yellow glycerine

Sugar refining

26 / 50

Reid vapour pressure of gasoline is the measure of its__________?

Carbon residue

Pour point

Cloud point

Vapour locking tendency

27 / 50

Older crude petroleum ___________?

Gives more distillates

All A., B. and C.

Gives less tar

Is light and better

28 / 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 ?

Naphtha

Kerosene

Heavy fuel oil

Petrol

29 / 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

30 / 50

Pick out the wrong statement ?

Characterisation factor of paraffinic crude oil is more than 12

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

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

31 / 50

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

Knocking tendency

Wax content

Sulphur content

Spontaneous ignition temperature

32 / 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

33 / 50

Penetration test determines the ______ of the grease?

Service temperature

Stiffness

Variation in viscosity with temperature

Lubricating properties (e.g. oilness)

34 / 50

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

High pour point and low smoke point

All A., B. and C.

Low viscosity index

High self-ignition temperature

35 / 50

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

Lower viscosity index lube oil

Higher octane number gasoline

Poorer yield of lube oil

Higher yield of straight run gasoline

36 / 50

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

94 & 100

87 & 94

94 & 87

83 & 100

37 / 50

Reforming converts__________?

Naphthenes into aromatics

Naphthenes into paraffin

Olefins into paraffins

Naphthenes into olefins

38 / 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

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

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

39 / 50

Presence of sulphur in gasoline_____?

Leads to corrosion

Decreases gum formation

Increases lead susceptibility

Helps during stabilisation

40 / 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

41 / 50

Reforming___________?

Uses naphtha as feedstock

Does not much affect the molecular weight of the feed

Improves the quality & yield of gasoline

All A., B. and C.

42 / 50

Presence of aromatics in ___________?

All A., B. and C.

Petrol increases its octane number

Kerosene increases its smoke point

Diesel increases its cetane number

43 / 50

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

High solubility of wax in the solvent

Complete miscibility with oil

Neither A. nor B.

Both A. and B.

44 / 50

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

Specific gravity

Viscosity

?API gravity

Flashpoint

45 / 50

Phenols are added in gasoline to______?

Increase its pour point

Improve the octane number

Reduce its viscosity

Act as an antioxidant

46 / 50

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

Dehydration

Visbreaking

Sweetening

Stabilisation

47 / 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

48 / 50

Pick out the wrong statement ?

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

Aromatics have lower specific gravity than corresponding paraffins

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

49 / 50

Operating temperature and pressure in catalytic reforming is about______?

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

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

1-5 Kgf/cm2 & 200?C

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

50 / 50

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

1.5

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