Petroleum Refining Engineering Set 3

An exothermic reaction ✘ An endothermic reaction ✘ Favoured at very low temperature ✘ None of these ✔

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

Sulphuric acid ✘ Nickel ✘ Silica gel ✘ Alumina ✔

Asphalt ✘ Sulphur compounds ✘ Wax ✘ Nitrogen compounds ✔

Low smoke point ✘ High smoke point ✘ High aromatics content ✘ Low paraffins content ✔

Iso-paraffin crack faster than n-paraffin. ✘ Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic ✘ Rate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking ✘ None of these ✔

Diesel ✘ Gasoline ✘ Naphtha ✘ Atmospheric residue ✔

Hexane ✘ Furfural ✘ Benzol and ethylene dichloride ✘ Methyl ethyl ketone (MEK) ✔

1 ✘ 4.08 ✘ 0.408 ✘ 40.8 ✔

Carnot ✘ CFR (Co-operative fuel research) ✘ Stirling ✘ Diesel ✔