chemical engineering MCQs – Page 173

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 Review each marked answer and report any item that may be outdated or unclear.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

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

3451. Extractor temperature is maintained at -20C in Edeleanu process to reduce the ______________ of kerosene?
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A. Naphthenes

B. Aromatics

C. Smoke point

D. Paraffins

3452. Absolute vapor pressure of petrofuels is found by Reid bomb which is heated in water bath to 100F. In Reid apparatus, the ratio of the volume of air chamber to that of the liquid fuel chamber is________________?
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A. 2

B. 1

C. 3

D. 4

3453. Catalyst used in the catalytic cracking is_____________________?
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A. Silica-alumina

B. Vanadium pentoxide

C. Nickel

D. Silica gel

3454. Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about ________________ ppm?
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A. 10000

B. 5000

C. 50

D. 1

3455. Clay treatment of petroleum products __________________?
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A. Adsorb arsenic from feedstock to catalytic reforming

B. Desulphurise straight run gasoline & kerosene

C. All A., B. & C.

D. Decolorizes & stabilises cracked gasoline

3456. Bottom product of atmospheric pressure crude oil distillation column is termed as________________?
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A. Asphalt

B. Residuum

C. Heavy ends

D. Reduced crude

3457. Main boring diameter for petroleum well is 20-30 cms in diameter, while the depth of the oil well may be about _____________ kms?
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A. 7.5 to 12.5

B. 0.1 to 0.5

C. 15-20

D. 1.5 to 4.5

3458. Asphalts are _________________?
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A. All A., B. & C.

B. Low molecular weight & low boiling point compounds present in petroleum

C. Desirable in catalytic cracking feedstock, because they produce coke

D. Readily oxidisable and form carbonaceous sludge

3459. The proper arrangement of the petroleum fractions in order of their boiling points is __________________ ?
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A. Lubricating oil > petrol > diesel > LPG

B. Lubricating oil > diesel > petrol > LPG

C. Petrol > diesel > LPG > lubricating oil

D. Petrol > lubricating oil > diesel > LPG

3460. With increase in density, the viscosity of petroleum products _____________________?
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A. Decreases

B. Remain same

C. Increases

D. Either A. or B.

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