chemical engineering Mcqs
3351. Liquefied petroleum Gas (LPG) used for the household cooking comprises mainly of _______________?
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A. Butane & ethane

B. Methane & carbon monoxide

C. Methane & ethane

D. Propane & butane
3352. Which of the following constituents present in petroleum is responsible for ash formation ?
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A. Oxygen compounds

B. Nitrogen compounds

C. Organometallic compounds

D. Sulphur compounds
3353. Flash point of atmospheric distillation residue is determined by ______________ apparatus?
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A. None of these

B. Pensky-Martens (closed cup type)

C. Abel

D. Cleveland (open cup type)
3354. Which of the following has the maximum API gravity of all ?
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A. Kerosene

B. Diesel

C. Furnace oil

D. Petrol
3355. The reservoir rock containing petroleum has_________________?
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A. Low porosity

B. High permeability

C. High porosity

D. Both B. and C.
3356. Octane number of gasoline produced by two stage fluidised catalytic cracking process is___________________?
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A. 92

B. 80

C. 97

D. 87

3357. Main constituent of natural gas is___________________?
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A. C2H2

B. C2H4

C. CH4

D. C2H6

3358. Which of the following has the highest gum forming tendency in gosoline ?
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A. Naphthenes

B. Aromatics

C. Diolefins

D. Paraffins

3359. Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than ______________ of the head?
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A. 6% of I.D.

B. Either A. or B., whichever is smaller

C. 3 times the thickness

D. Either A. or B., whichever is larger
3360. Operating condition in the electrical dehydrators for crude oil is about____________________?
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A. 6.5 kgf/Cm2 & 95C

B. 1 atm. & 110 C

C. 50 atm. and 150C

D. 20 kgf/cm2 & 110C

3361. _____________ base crude oil is also called asphaltic crude?
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A. Mixed

B. Naphthenic

C. Paraffinic

D. Aromatic

3362. Waxes present in petroleum products_________________?
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A. Crystallise out at low temperature

B. Decrease their viscosity

C. Are not soluble in them

D. Can be separated out by distillation

3363. Deoiling is the process of removal of oil from wax. It is done by the _______________ process?
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A. All A., B. & C.

B. Resettling

C. Solvent extraction

D. Sweating

3364. Straight run petrol as compared to methyl/ethyl alcohol has_________________?
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A. Lower calorific value

B. Higher ignition temperature

C. Higher specific gravity

D. Lower octane number
3365. The coking process normally mostly used in Indian oil refineries is the ____________________ coking process ?
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A. Fluid

B. Delayed

C. Flexi

D. Contact

3366. Older crude petroleum __________________?
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A. Gives more distillates

B. Gives less tar

C. Is light and better

D. All A., B. and C.

3367. Cetane number of high speed diesel must be ?_________________?
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A. 75

B. 45

C. 30

D. 95

3368. Catalyst used in catalytic reforming is__________________?
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A. Platinum on alumina

B. Nickel

C. Iron

D. Aluminium chloride

3369. Pyrolysis of kerosene or natural gasoline is done to produce mainly the___________________?
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A. Stabilised gasoline

B. Olefins and aromatics

C. Lighter paraffins

D. Diesel

3370. Gasoline yield in catalytic reforming of naphtha may be about _________________ percent by weight?
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A. 65

B. 50

C. 98

D. 85
3371. True boiling point apparatus is used for the__________________?
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A. Evaluation of oil stocks

B. None of these

C. Determination of true vapour pressure

D. Determination of characterisation factor

3372. Petroleum is believed to have originated from _______________ sources?
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A. Vegetable

B. Animal

C. Both A. and B.

D. Neither A. nor B.

3373. Thermofor catalytic cracking process is a ______________ process?
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A. Fixed bed

B. Moving bed

C. Fluidised bed

D. Non-catalytic
3374. 95% (by volume) of LPG at 760 mm Hg pressure will evaporate at __________ C?
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A. 2

B. 55

C. 30

D. -40

3375. Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has__________________?
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A. High self-ignition temperature

B. High pour point and low smoke point

C. Low viscosity index

D. All A., B. and C.

3376. Aniline point test of an oil qualitatively indicates the ______________ content of an oil?
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A. Paraffin

B. Olefin

C. Naphthene

D. Aromatic
3377. Reforming__________________?
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A. Uses naphtha as feedstock

B. All A., B. and C.

C. Does not much affect the molecular weight of the feed

D. Improves the quality & yield of gasoline

3378. Petrolatum is__________________?
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A. None of these

B. Petroleum coke

C. A mixture of microcrystalline wax in viscous hydrocarbon liquids

D. Same as petroleum ether

3379. The main aim of cracking is to produce ____________________?
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A. Gasoline

B. Coke

C. Lube oil

D. Petrolatum

3380. Stage efficiency for packed tower varies with the____________________?
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A. Operating pressure and column diameter

B. All A., B. and C.

C. Fluid rates and fluid properties

D. Type & size of packing

3381. Highest quality bitumen is produced from the __________________ crude oil?
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A. Naphthenic

B. Mixed

C. Intermediate

D. Paraffinic

3382. During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) ________________ with increase in the amount of water?
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A. Remains unchanged

B. Increases

C. Decreases

D. Decreases linearly

3383. Products drawn from the top to bottom of the crude oil distillation column has progressively increasing ___________________?
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A. Boiling points

B. All A., B. and C.

C. Molecular weight

D. C/H ratio

3384. Cetane number of diesel used in trucks may be about __________________?
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A. 35

B. 85

C. 50

D. 14

3385. Pick out the undesirable property for a solvent meant for dewaxing of lube oil ?
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A. Complete miscibility with oil

B. High solubility of wax in the solvent

C. Both A. and B.

D. Neither A. nor B.

3386. Penetration test determines the _____________ of the grease?
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A. Lubricating properties (e.g. oilness)

B. Stiffness

C. Service temperature

D. Variation in viscosity with temperature

3387. Reid vapour pressure of gasoline is the measure of its_________________?
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A. Carbon residue

B. Vapour locking tendency

C. Cloud point

D. Pour point

3388. Pick out the wrong statement pertaining to shell and tube heat exchanger_______________?
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A. ber of tie rods is 4 with at least 10 mm diameter

B. Clearance between shell & baffles and between tube & baffles should be minimum to avoid

C. Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum

D. passing of the fluid, but it should be enough to permit the removal of tube bundle

E. Bracket supports are used for horizontal shell, while saddle support is used for vertical shell

F. Baffles are supported independently of the tubes by tie rods and positioned by spacers

3389. The main reaction in reforming is the _____________________?
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A. Hydrocracking of paraffins

B. Dehydrogenation of naphthenes

C. Saturation of olefins

D. Hydrogenation of naphthenes

3390. For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell_________________?
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A. May decrease or increase upwards depending upon whether vacuum or positive pressure

B. ld be maintained inside the shell

C. Remains same throughout

D. Increases upwards

E. Decreases upwards
3391. Smoke point of a test sample of kerosene is found to be 15 mm. On removal of ________________ from it, the smoke point rises to 25 mm?
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A. n-paraffins

B. None of these

C. Aromatics

D. Olefins

3392. Aniline point is the _________________?
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A. Characteristic property of diesel & lubricating oils

B. Measure of aromatic content of oil

C. Both A. and B.

D. Neither A. nor B.

3393. Crude oil is transported inland from oil field to refineries, mainly by the _____________________?
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A. Underground pipelines

B. Rail tankers

C. None of these

D. Road tankers

3394. Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to__________________?
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A. Enhance the octane number of gasoline

B. Increase the yield of light distillates

C. Suppress coke formation

D. Reduce gum content in gasoline

3395. A multigrade lubricating oil means an oil having high __________________?
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A. Aniline point

B. Viscosity index

C. Viscosity

D. Flash point

3396. Aniline point of high speed diesel may be about ____________ C ?
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A. 150

B. 105

C. 35

D. 70
3397. Smoke point of kerosene expresses its__________________?
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A. Burning characteristics

B. Lamp wick wetting characteristics

C. Aromatic content directly

D. Luminosity characteristics

3398. ______________ test is done to find out the softening point of bitumen?
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A. Flame

B. Viscosity

C. Impact

D. Ball and ring
3399. The most commonly used feed stock for the reforming reactor is ___________________?
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A. Casing head gasoline

B. Heavy fuel oil

C. Straight run gasoline

D. Residuum

3400. The yield of straight run LPG from crude oil is about ______________ weight percent?
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A. 15-Oct

B. 20-25

C. 0.1-0.2

D. 1-1.5