chemical engineering MCQs – Page 170

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 Review each marked answer and report any item that may be outdated or unclear.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
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