Dehydrogenation of naphthene
Dehydrogenation of lower paraffins
Dehydrocyclisation of higher paraffins
Isomerisation of paraffins
✅ The correct answer is option B.
Petroleum Refinery Engineering MCQs
102. 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)
✅ The correct answer is option D.
103. An upper limit of oil content is limited to about __________ percent for achieving efficient and satisfactory level of wax sweating.
5
15
40
60
✅ The correct answer is option C.
104. Which of the following has the highest viscosity of all (at a given temperature) ?
Naphtha
Fuel oil
Light diesel oil
Petrol
✅ The correct answer is option B.
105. Which of the following is a naphthene ?
Butene
Butadiene
Cyclohexane
Acetylene
✅ The correct answer is option C.
106. A good lubricant should have high
viscosity index
volatility
pour point
none of these
✅ The correct answer is option A.
107. Tetraethyl lead is added to the petrol to increase its octane number, because its octane number is
more than 100
round about 100
between 50 and 100
less than 25
✅ The correct answer is option A.
108. Naphthenic acid is represented by
CnH2n+2O2
CnH2n-2O2
CnH2n+2O2 (n ≥ 6)
CnH2n+6O2 (n ≤ 6)
✅ The correct answer is option B.
109. Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about __________ mm Hg absolute.
1 to 5
30 to 80
250 to 350
450 to 500
✅ The correct answer is option B.
110. Presence of sulphur in gasoline
leads to corrosion.
increases lead susceptibility.
decreases gum formation.
helps during stabilisation.
✅ The correct answer is option A.