chemical engineering MCQs – Page 175

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 Review each marked answer and report any item that may be outdated or unclear.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
3481. Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about ______________ percent of the total thickness?
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A. 40 to 50

B. 10 to 20

C. 1 to 5

D. 30 to 40

3482. What is the slope of the feed line, if the feed to a distillation column is a saturated liquid ?
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A. 0

B. > 1

C. < 1

D. ?
3483. Petroleum liquid fuels having flash point greater than 66C is considered as safe during storage and handling. Which of the following has flash point > 66C ?
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A. Naphtha

B. Petrol

C. Heavy fuel oil

D. Kerosene

3484. Naphthenic acid is represented by ___________________?
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A. CnH2n-2O2

B. CnH2n+2O2 (n ? 6)

C. CnH2n+2O2

D. CnH2n+6O2 (n ? 6)

3485. Which of the following factors does not govern the mechanism of petroleum formation from organic sources ?
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A. Heat

B. Bacterial action

C. pH of the soil

D. Pressure

3486. Alkylation_____________________?
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A. Causes olefins to combine with iso-paraffins

B. Causes olefins to combine with each other

C. Converts olefin into paraffin

D. Converts iso-paraffin into olefin

3487. Aromatics are desired constituents of____________________?
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A. Petrol

B. Kerosene

C. Diesel

D. Lubricating oil

3488. Extractor temperature is maintained at -20C in Edeleanu process to reduce the _________________ of kerosene?
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A. Paraffins

B. Naphthenes

C. Aromatics

D. Smoke point

3489. Percentage of straight run gasoline in a typical crude oil may be around________________?
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A. 52

B. 38

C. 6

D. 18

3490. Presence of aromatics in __________________?
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A. Kerosene increases its smoke point

B. Petrol increases its octane number

C. Diesel increases its cetane number

D. All A., B. and C.

3491. Pour point of a petrofuel is________________?
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A. Multiple of 5F

B. Multiple of 3F

C. 5C below the temperature at which oil ceases to flow

D. None of these

3492. Feed for reforming is generally___________________?
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A. Reduced crude

B. Naphtha or straight run gasoline

C. Atmospheric gas oil

D. Vacuum gas oil

3493. Crude oil is subjected to vacuum distillation in the last stage, because_________________?
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A. None of these

B. High purity products can be obtained thereby

C. Lighter/low boiling products are prone to thermal decomposition

D. High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may

E. ompose</strong>

3494. Viscosity index of a lubricating oil_________________?
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A. Is the measure of variation of viscosity with temperature

B. None of these

C. Should be low

D. Is the measure of its flash point

3495. Diesel index (an alternative index for expressing the quality of diesel) is_______________?
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A. Not related to aniline point

B. All A., B. & C.

C. Equal to cetane number plus 3

D. Determined by using a test engine

3496. Smoke volatility index is equal to smoke point plus______________________?
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A. 0.42 (% distilled at 204C)

B. 0.84 (% distilled at 204C)

C. 5 mm

D. 10 mm approximately

3497. Visbreaking process is used mainly for making_________________?
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A. Fuel oil

B. High octane gasoline

C. High cetane diesel

D. Smoke free kerosene

3498. Which of the following is a non-regenerative fixed bed catalytic reforming process ?
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A. Platforming

B. Hyperforming

C. Thermofor catalytic reforming

D. Hydroforming

3499. Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ?
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A. 19

B. 16

C. 28

D. 38

3500. In catalytic alkylation, higher iso-butane to olefin ratio gives_________________?
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A. Low final boiling point product

B. Higher yield

C. Both A. and B.

D. Neither A. nor B.