Petroleum Refinery Engineering - Chemical Engineering Questions and Answers

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Which of the following hydrocarbons of same carbon atoms has minimum smoking tendency ?

Paraffins

Naphthenes

Aromatics

Iso-paraffins

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Petroleum is believed to have originated from __________ sources.

vegetable

animal

both (a) and (b)

neither (a) nor (b)

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Which of the following has the lowest flash point of all?

Diesel

Kerosene

Petrol

Furnace oil

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Cetane number of high speed diesel must be ≥

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LSHS is a type of furnace oil, which

is more viscous than high viscosity furnace oil (HVFO).

stands for low sulphur heavy stock.

is an ideal fuel for metallurgical furnaces due to its lower sulphur content (< 1%).

all (a), (b) and (c).

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Hydrofining is the most recent and effective method for the

removal of sulphur.

improvement of smoke point.

reduction of breathing loss.

improvement of viscosity index.

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Isomerisation converts the __________ tot-paraffins.

paraffins

olefins

naphthenes

none of these

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Straight run petrol as compared to methyl/ethyl alcohol has

lower calorific value.

lower octane number.

higher specific gravity.

higher ignition temperature.

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

high boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose.

lighter/low boiling products are prone to thermal decomposition.

high purity products can be obtained thereby.

none of these.