low porosity
high permeability
high porosity
both (b) and (c)
✅ The correct answer is option D.
Chemical Engineering MCQs
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.
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.
Liquefied Petroleum Gas (LPG) is mainly a mixture of
propane & butane
methane & ethane
high boiling olefins
high boiling naphthenes
✅ The correct answer is option A.
Octane number of gasoline is a measure of its
resistance to knock.
ignition delay.
ignition temperature.
smoke point.
✅ The correct answer is option A.
Which of the following has the lowest flash point of all?
Diesel
Kerosene
Petrol
Furnace oil
✅ The correct answer is option C.
The terminology used for the bottom most product from the vacuum crude distillation unit is
residual crude
residuum
reduced crude
petrolatum
✅ The correct answer is option B.
Which of the following is desirable in diesel and kerosene but is undersirable in gasoline ?
Aromatics
Mercaptans
Paraffins
Naphthenic acid
✅ The correct answer is option C.
Hydrocracking employs
high pressure & temperature.
low pressure & temperature.
high pressure and low temperature.
high temperature and low pressure.
✅ The correct answer is option A.
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.