methanol in Unisol process.
naphthenic acid in Mercapsol process.
both (a) and (b).
neither (a) nor (b).
✅ The correct answer is option C.
Petroleum Refinery Engineering MCQs
242. 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).
✅ The correct answer is option C.
243. Octane number of gasoline is a measure of its
resistance to knock.
ignition delay.
ignition temperature.
smoke point.
✅ The correct answer is option A.
244. In a refinery petroleum crude is fractionated into gas fraction, light ends, intermediate distillates, heavy distillates, residues and by products. The group of products including gas oil, diesel oil and heavy fuel oil belongs to the fraction
heavy distillates
intermediate distillates
light ends
residues
✅ The correct answer is option A.
245. Which of the following has the lowest flash point of all?
Diesel
Kerosene
Petrol
Furnace oil
✅ The correct answer is option C.
246. Hydrocracking employs
high pressure & temperature.
low pressure & temperature.
high pressure and low temperature.
high temperature and low pressure.
✅ The correct answer is option A.
247. Increase in the specific gravity of petroleum products indicates
decrease in paraffin content.
increase in thermal energy per unit weight.
increase in aromatic content.
higher H/C ratio.
✅ The correct answer is option A.
248. Which of the followingis desirable in petrol (gasoline) but undesirable in kerosene ?
Paraffins
Aromatics
Mercaptans
Naphthenic acid
✅ The correct answer is option C.
249. Cracking is
an exothermic reaction.
an endothermic reaction.
favoured at very low temperature.
none of these.
✅ The correct answer is option B.
250. Mercaptans are
low boiling sulphur compounds.
added in LPG cylinders to detect gas leakage by its smell.
undesirable in petrol, as they reduce its octane number.
all (a), (b) and (c)
✅ The correct answer is option D.