chemical engineering MCQs – Page 164

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
3261. In case of liquid petrofuels, momentary combustion is observed at its ________________________?
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A. Flash point

B. Flame temperature

C. Fire point

D. Preheating temperature corresponding to viscosity of 25 centistokes

3262. Waxy crudes are treated with chemical additives mainly to_________________________?
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A. Precipitate wax

B. Remove wax

C. Dissolve wax

D. Depress its pour point
3263. Tetra-ethyl lead is added in gasoline to ______________________?
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A. Increase its smoke point

B. Increase its octane number

C. Reduce gum formation

D. Reduce the pour point

3264. Paraffin base crude oil as compared to asphalt base crude gives___________________?
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A. Poorer yield of lube oil

B. Higher yield of straight run gasoline

C. Lower viscosity index lube oil

D. Higher octane number gasoline

3265. Which of the following has the lowest viscosity (at a given temperature) of all ?
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A. Lube oil

B. Diesel

C. Naphtha

D. Kerosene

3266. ________________ treatment is done for appreciable improvement in viscosity index of lubricating oil?
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A. Solvent extraction

B. Alkali

C. Acid

D. Clay

3267. Operating temperature and pressure in catalytic reforming is about_____________?
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A. 15-45 Kgf/cm2 & 450-550C

B. 5-10 kgf/cm2 & 150 250C

C. 50 75 kgf/cm2 & 600 800C

D. 1-5 Kgf/cm2 & 200C

3268. Which of the following has the highest octane number ?
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A. Naphthenes

B. Olefins

C. Aromatics

D. i-paraffins

3269. Presence of sulphur in gasoline___________________?
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A. Decreases gum formation

B. Helps during stabilisation

C. Increases lead susceptibility

D. Leads to corrosion
3270. Sweetening of petroleum product means the removal of ______________________?
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A. Wax

B. Water

C. Sulphur & its compounds

D. Organic impurities

3271. Solvent used in duo-sol extraction for lube oil upgradation is a mixture of______________?
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A. Propane & liquid sulphur dioxide

B. Methyl ethyl ketone & glycol

C. Phenol & furfural

D. Propane & phenol-cresol mixture
3272. Most widely used solvent for dewaxing is__________________?
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A. Petroleum ether

B. Naphtha

C. Methyl-ethyl-ketone (MEK)

D. Sodium plumbite

3273. A typical yield of kerosene in straight run distillation of crude oil may be about __________________ percent?
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A. 18

B. 10

C. 26

D. 4

3274. The amount of tetraethyl lead added to improve the octane number of motor gasoline is around ______________ c.c per gallon of petrol?
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A. 300

B. 3

C. 3000

D. 1000

3275. Diesel used in naval applications has a minimum cetane number of ___________________?
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A. 35

B. 65

C. 25

D. 45
3276. Boiling range of motor gasoline is an indication of the ___________________?
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A. Vapour locking tendency

B. All A., B. and C.

C. Case of starting

D. Rate of acceleration
3277. Power required for agitation depends upon the______________________?
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A. Size of agitator & the tank

B. All A., B. and C.

C. Agitator type & speed of agitation

D. Height & properties of the liquid

3278. Natural gasoline is produced___________________?
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A. From oil wells

B. In oil refineries

C. None of these

D. By natural gas stripping
3279. In sweetening process, solutizer agent used with caustic alkali is_______________?
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A. Potassium isobutyrate

B. Methanol

C. Phenol

D. Sodium plumbite

3280. Flash point of an oil gives an idea of the___________________?
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A. Amount of low boiling fraction present

B. All A., B. and C.

C. Explosion hazards

D. Nature of boiling point diagram of the system