Petroleum Refinery Engineering
Petroleum deposits are detected by the.

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

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Petroleum Refinery Engineering
Choose the correct statement regarding thermal cracking.

Moderate changes in operating temperature does not change the depth of cracking
Increased residence time results in the decreased severity of cracking
Greater depth of cracking gives lower octane number gasoline
At low pressure, the yield of lighter hydrocarbons are more

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