chemical engineering MCQs – Page 171

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 Review each marked answer and report any item that may be outdated or unclear.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

3401. Ethyl mercaptan is a/an ___________________ compound?
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A. None of these

B. Oxygen

C. Sulphur

D. Nitrogen

3402. ____________ is not an important refinery process for upgrading the quality of lubricating oil ?
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A. Hydro-treatment

B. Deoiling

C. Solvent refining

D. Clay treatment

3403. In the atmospheric pressure crude distillation, the content of _____________ from lighter fraction to heavier ones?
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A. Sulphur decreases

B. Sulphur increases

C. Nitrogen decreases

D. None of these

3404. The terminology used for the bottom most product from the vacuum crude distillation unit is______________?
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A. Reduced crude

B. Petrolatum

C. Residual crude

D. Residuum

3405. Which is the most undesirable component in kerosene ?
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A. n-paraffins

B. i-paraffins

C. Naphthenes

D. Aromatics

3406. In case of plain carbon steel, butt welded joints are used for shell plate thickness ? _____________ cms?
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A. 3.8

B. 6.8

C. 0.5

D. 1.2

3407. Electrical desalting of crude oil removes the _______________ impurities?
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A. Oleophilic

B. Oleophobic

C. Both A. and B.

D. Neither A. nor B.

3408. The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to ____________________?
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A. Sustain the reactor pressure

B. Obviate catalyst poisoning

C. Hydrogenate the feed stock

D. Maintain the reaction temperature

3409. H/C ratio (by weight) for the same number of carbon atoms is the highest in case of____________________?
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A. Paraffins

B. Naphthenes

C. Aromatics

D. Olefins

3410. Which of the following is not a sulphur compound present in petroleum ?
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A. Thiophenes

B. Sulphones

C. Pyrroles

D. Mercaptans

3411. Which is an anticing compound ?
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A. Amyl nitrate

B. Alcohols

C. Mercaptans

D. Pyridine

3412. Performance number of a liquid fuel is related to its __________________?
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A. Wax content

B. Knocking tendency

C. Sulphur content

D. Spontaneous ignition temperature

3413. Removal of light fractions from crude oil is called its _____________________?
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A. Sweetening

B. Visbreaking

C. Dehydration

D. Stabilisation

3414. Catalytic desulphurisation process used for sweetening of straight run gasoline and kerosene uses _______________ as catalyst?
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A. Fullers earth

B. Activated clay

C. All A., B. & C.

D. Bauxite

3415. Iso-octane is used as a reference substance in the definition of octane number and it is assigned an octane number value of 100. Iso-octane is chemically known as ___________________?
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A. ?-methyl naphthalene

B. 1, 3 butadiene

C. 2-2-4 tri methyl pentane

D. Tetra methyl ethylene

3416. Which of the following processes consumes hydrogen ?
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A. None of these

B. Visbreaking

C. Propane deasphalting

D. Fluid catalytic cracking

3417. Which of the following processes in oil refinery does not employ cracking??
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A. Coking

B. None of these

C. Pyrolysis

D. Visbreaking

3418. Solvent used in the Udex (glycol) extraction process for removal of light aromatics from cracked naphtha is_________________?
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A. Propane

B. Methyl ethyl ketone (MEK)

C. Aqueous solution (10% water) of diethylene glycol

D. Diethylene glycol

3419. With increase in the molecular weight of aromatic present in kerosene, its smoking tendency ?
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A. Remain same

B. Is unpredictable

C. Increases

D. Decreases

3420. Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about ______________ kg/cm2?
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A. 3

B. 12

C. 1.5

D. 6

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