Paraffins
Aromatics
Mercaptans
Naphthenic acid
✅ The correct answer is option C.
Chemical Engineering MCQs
Pressure & temperature maintained in catalytic cracking is about
2atm & 500°C
10atm & 500°C
30atm & 200°C
50atm. & 750°C
✅ The correct answer is option A.
Cracking is
an exothermic reaction.
an endothermic reaction.
favoured at very low temperature.
none of these.
✅ The correct answer is option B.
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.
Cetane number of a diesel fuel is the measure of its
ignition delay
smoke point
viscosity
oxidation stability
✅ The correct answer is option A.
Sour crude means the __________ bearing crude.
asphalt
sulphur compounds
wax
nitrogen compounds
✅ The correct answer is option B.
A multigrade lubricating oil means an oil having high
viscosity index
viscosity
aniline point
flash point
✅ The correct answer is option A.
Reforming converts
olefins into paraffins
naphthenes into aromatics
naphthenes into olefins.
naphthenes into paraffin.
✅ The correct answer is option B.
Octane number (unleaded) of gasoline produced by isomerisation of butane may be about
45
55
70
90
✅ The correct answer is option C.