Petroleum Refinery Engineering - Chemical Engineering Questions and Answers

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Products drawn from the top to bottom of the crude oil distillation column has progressively increasing

boiling points

molecular weight

C/H ratio

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

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Asphalts are

low molecular weight & low boiling point compounds present in petroleum.

desirable in catalytic cracking feedstock, because they produce coke.

readily oxidisable and form carbonaceous sludge.

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

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Smoke point of kerosene is the

time after which smoking starts on burning.

temperature at which smoking starts.

maximum height of flame (in mm) without causing smoking, when burnt in a standard lamp.

none of these.

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The conductivity of crude oil-water mixture depends on the

pH value

water percentage

temperature

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

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Which of the following is not an important property of fuel oil/furnace oil ?

Sulphur content

Viscosity

Aniline point

Flash point

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Which of the followingis desirable in petrol (gasoline) but undesirable in kerosene ?

Paraffins

Aromatics

Mercaptans

Naphthenic acid

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Extractor temperature is maintained at -20°C in Edeleanu process to reduce the __________ of kerosene.

smoke point

paraffins

aromatics

naphthenes

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Cracking is

an exothermic reaction.

an endothermic reaction.

favoured at very low temperature.

none of these.

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The most important property for a jet fuel is its

viscosity

freezing point

calorific value

flash point