Petroleum Refinery Engineering MCQ Questions & Answers | Chemical Engineering

Older crude petroleum is generally considered light and better because it has undergone natural refining processes over time.

It typically gives more distillates, which are the valuable fractions obtained during refining.

Additionally, older crude gives less tar, making it more desirable for refining purposes.

Therefore, all the statements are true, making Option D: All of the above the correct answer.

In petroleum refinery engineering, olefins are unsaturated cyclic compounds (hydrocarbons) (Option B).

Olefins, also known as alkenes, are a class of hydrocarbons containing at least one carbon-carbon double bond. They are unsaturated compounds because they contain fewer hydrogen atoms than the corresponding saturated hydrocarbons. Olefins are widely used in the petrochemical industry as feedstocks for producing various chemicals, including plastics, solvents, and synthetic fibers.

Therefore, the correct option is Option B: Unsaturated cyclic compounds (hydrocarbons).