Chemical Engineering - Petroleum Refinery Engineering

11. 

The proper arrangement of the petroleum fractions in order of their boiling points is

A. lubricating oil > diesel > petrol > LPG
B. lubricating oil > petrol > diesel > LPG
C. petrol > lubricating oil > diesel > LPG
D. petrol > diesel > LPG > lubricating oil

Answer: Option A

Explanation:

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12. 

Octane number of gasoline produced by two stage fluidised catalytic cracking process is

A. 80
B. 87
C. 92
D. 97

Answer: Option D

Explanation:

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13. 

Pick out the wrong statement.

A. Higher specific gravity of petroleum products means higher C/H ratio.
B. Aromatics have lower specific gravity than corresponding paraffins.
C. Hydrocarbons of low specific gravity (e.g, paraffins) possess the maximum thermal energy per unit volume.
D. Hydrocarbons of high specific gravity (eg, aromatics) possess the maximum thermal energy per unit weight.

Answer: Option B

Explanation:

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14. 

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

A. increase the yield of light distillates.
B. suppress coke formation.
C. enhance the octane number of gasoline.
D. reduce gum content in gasoline.

Answer: Option B

Explanation:

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15. 

Pick out the wrong statement.

A. Higher temperature is employed in visbreaking than in thermal cracking.
B. Pyrolysis is a mild thermal cracking process.
C. Lead suceptibility of petrol produced by catalytic process is more than that produced by thermal cracking.
D. Operating pressure and temperature in thermal cracking process is more than that in catalytic cracking process.

Answer: Option A

Explanation:

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