Petroleum Refinery Engineering
In a refinery petroleum crude is fractionated into gas fraction, light ends, intermediate distillates, heavy distillates, residues and by products. The group of products including gas oil, diesel oil and heavy fuel oil belongs to the fraction

Residues
Heavy distillates
Light ends
Intermediate distillates

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Petroleum Refinery Engineering
Mercaptans are

Low boiling sulphur compounds
All of these
Undesirable in petrol, as they reduce its octane number
Added in LPG cylinders to detect gas leakage by its smell

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Petroleum Refinery Engineering
Pick out the correct statement pertaining to catalytic cracking.

With increase in the reactor pressure, octane number of gasoline decreases
All of these
Percentage conversion increases with increase in the catalyst to oil ratio
With increase in the reactor temperature, gasoline yield decreases for a given conversion

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