Petroleum Refinery Engineering
Petroleum deposits are detected by the.

Oil seepage at the surface of the earth
Measuremet of density, elasticity and magnetic & electric properties of the rock in the crust of the earth
Age & nature of rocks inside the crust of the earth
All of these

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Petroleum Refinery Engineering
Crude oil is subjected to vacuum distillation in the last stage, because

High purity products can be obtained thereby
Lighter/low boiling products are prone to thermal decomposition
None of these
High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose

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