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What is obtained when the vaporized crude oil is again passed through the heater and vacuum?

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in Automotive Engine Design by (137k points)
What is obtained when the vaporized crude oil is again passed through the heater and vacuum?

(a) Heavy gas oils

(b) lubricating oils

(c) Petrol

(d) Both heavy gas oils and lubricating oils

I had been asked this question in an interview for internship.

This key question is from Fuels in section Fuels, Intake System & Leakage Preventers of Automotive Engine Design

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The correct option is (a) Heavy gas oils

To explain: . The vaporized crude oil is passed through the heater and vacuum to obtain heavy gas oils and lubricating oils. Heavy gas oils have higher pressure and temperature and burn completely.

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