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

3421. Catalyst used in the isomerisation is_______________________?
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A. Nickel

B. Phosphoric acid

C. Alumina

D. Aluminium chloride
3422. Sour crude means the ________________ bearing crude?
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A. Asphalt

B. Nitrogen compounds

C. Wax

D. Sulphur compounds
3423. Higher pressure in the reforming reactor________________?
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A. None of these

B. Produces high octane number gasoline

C. Increases coke formation

D. Increases the rate of reaction

3424. Pick out the wrong statement pertaining to the design of a horizontal tube evaporator ?
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A. Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator

B. ght = 2.5-4 metres

C. It is suitable for process, in which the final product is a liquor instead of solid

D. It is unsuitable for concentrating those liquids, which form a scale or deposit salt

E. Liquor flows inside the tube, while the steam is outside submerging the tube
3425. The LMTD correction factor (FT) is defined as the __________________?
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A. Geometric mean of the true temperature difference and the LMTD

B. Ratio of LMTD to the true temperature difference

C. Ratio of true temperature difference to the LMTD

D. Differenced of true temperature difference and the LMTD

3426. In catalytic cracking process, olefins crack ______________ times faster than in thermal cracking process?
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A. 100

B. 200-300

C. 10

D. 1000-10000
3427. Platforming is a ____________ process?
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A. Moving bed

B. Fluidised bed

C. Non-regenerative & fixed bed

D. Regenerative

3428. Liquefied Petroleum Gas (LPG) in domestic use cylinders is in the liquid form. The density of LPG in liquid form is about ________________ of that of water (i.e. 1 gm/c.c)?
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A. One fourth

B. One eighth

C. One third

D. Half
3429. Molecular weight of petrol may be about ____________________?
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A. 40-60

B. 350-400

C. 250-300

D. 100-130
3430. Sulphur content in lighter and heavier petroleum products is generally determined respectively by _______________?
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A. Bomb method and quartz tube method

B. Lamp method and bomb method

C. Bomb method and lamp method

D. Quartz tube method and lamp method

3431. Crude oils containing more than ____________ kg of total salts (expressed in terms of NaCl) per thousand barrel is called a salty crude ?
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A. 15

B. 1

C. 25

D. 5
3432. Testing of the knocking characteristics of petrofuels is done in a _________________ engine ?
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A. Stirling

B. Carnot

C. Diesel

D. CFR (Co-operative fuel research)
3433. Cetane number of a diesel fuel is the measure of its____________________?
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A. Viscosity

B. Ignition delay

C. Smoke point

D. Oxidation stability

3434. Dearomatization of kerosene (by liquid sulphur dioxide extraction) is done to________________?
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A. Increase its smoke point

B. Improve its oxidation stability

C. Decrease the breathing loss

D. None of these

3435. Both asphalt and wax are produced by ______________ base crude oils?
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A. Paraffin

B. Naphthenic

C. Asphalt

D. Mixed
3436. Which of the following tests is not done for transformer oil ?
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A. Dielectric strength

B. Copper strip corrosion test

C. Flash point and acid value

D. Aniline point
3437. In solutizer sweetening process, solutizer solution used is_______________?
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A. Methanol in Unisol process

B. Naphthenic acid in Mercapsol process

C. Both A. and B.

D. Neither A. nor B.

3438. Which of the following petroleum products contain minimum sulphur ?
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A. Furnace oil

B. LSHS

C. Kerosene

D. Naphtha
3439. Visbreaking__________________?
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A. Produces fuel oil of lower viscosity

B. Uses natural gas as feed

C. Is carried out at atmospheric pressure

D. Produces gasoline only

3440. Mercaptans are________________?
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A. Undesirable in petrol, as they reduce its octane number

B. Low boiling sulphur compounds

C. Added in LPG cylinders to detect gas leakage by its smell

D. All A., B. and C.
3441. Hydrogen percentage (by weight) in crude petroleum may be about __________________?
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A. 25

B. 35

C. 15

D. 5

3442. Which of the following is the most important property for a jet fuel ?
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A. Colour

B. Cloud point

C. Pour point

D. Freezing point
3443. Petroleum ________________ ?
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A. Does not contain asphalt

B. Is optically active

C. Constitutes mainly of olefins

D. Does not contain aromatics

3444. The octane number of aviation gasoline may be __________________?
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A. 79

B. > 100

C. 87

D. 97

3445. Which of the following processes is used for the production of petroleum coke ?
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A. Cracking

B. Visbreaking

C. Reforming

D. Stabilisation

3446. 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?
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A. 100

B. 10

C. 5

D. 25
3447. Smoke point of kerosene is the_______________?
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A. Temperature at which smoking starts

B. None of these

C. Maximum height of flame (in mm) without causing smoking, when burnt in a standard lamp

D. Time after which smoking starts on burning

3448. Octane number (unleaded) of reformed gasoline may be upto ________________?
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A. 90

B. 60

C. 70

D. 80

3449. Higher viscosity of lubricating oil usually signifies_______________________?
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A. Lower Reid vapour pressure

B. Lower flash point and fire point

C. Higher flash point and fire point

D. Higher acid number

3450. Which of the following is desirable in petrol (gasoline) but undesirable in kerosene ?
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A. Mercaptans

B. Naphthenic acid

C. Paraffins

D. Aromatics