Petroleum Refinery Engineering - Chemical Engineering Questions and Answers

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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.

At low pressure, the yield of lighter hydrocarbons are more.

Greater depth of cracking gives lower octane number gasoline.

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A typical yield of diesel in straight run distillation of crude oil may be about __________ percent.

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Which is almost absent in crude petroleum?

Olefins

Mercaptans

Naphthenes

Cycloparaffins

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Naphthenic acid is a/an __________ compound.

sulphur

nitrogen

oxygen

none of these

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Glycol added to petrol acts as a/an __________ agent.

anti-knocking

anti-icing

anti-gum forming

dewaxing

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Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil

gives higher yield of petrol.

lower octane number of petrol.

higher sulphur content in the product.

higher gum forming material in petrol.

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Which one is used to determine the colour of petroleum products ?

Colour comparator

Saybolt chromometer

Cleveland apparatus

None of these

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Pick out the wrong statement.

Iso-paraffin crack faster than n-paraf-fin.

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.

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Feedstock for the production of biodiesel is

herbal plants

used vegetable oils

LSHS

bagasse