111. “Breathing loss” on storage of gasoline occurs due to the
presence of unsaturated air.
fluctuation of ambient temperature during day and night.
both (a) and (b).
neither (a) nor (b).
✅ The correct answer is option B.
Petroleum Refinery Engineering MCQs
112. Solvent used in duo-sol extraction for lube oil upgradation is a mixture of
propane & phenol-cresol mixture.
methyl ethyl ketone & glycol.
phenol & furfural.
propane & liquid sulphur dioxide.
✅ The correct answer is option A.
113. Diesel used in naval applications has a minimum cetane number of
25
35
45
65
✅ The correct answer is option C.
114. The average boiling point of aviation turbine fuel is closest to that of
lubricating oils
LPG
diesel
Kerosene
✅ The correct answer is option D.
115. Flash point of a liquid petroleum fuel gives an idea about its
volatility.
explosion hazards characteristics.
nature of boiling point diagram.
all (a), (b) and (c)
✅ The correct answer is option D.
116. The order of preference for feedstock to a catalytic reformer is
catalytic naphtha – coking naphtha – virgin naphtha.
coking naphtha – virgin naphtha – catalytic naphtha.
virgin naphtha – catalytic naphtha – coking naphtha.
virgin naphtha – coking naphtha – catalytic naphtha.
✅ The correct answer is option B.
117. With increase in the number of carbon and hydrogen atoms in hydrocarbon molecules, the density of petroleum products
decreases
increases
remains same
unpredictable from the data
✅ The correct answer is option B.
118. Which is almost absent in crude petroleum?
Olefins
Mercaptans
Naphthenes
Cycloparaffins
✅ The correct answer is option A.
119. Which parameter is used for the grading of paraffin waxes ?
Specific gravity
Melting point
Viscosity
Penetration number
✅ The correct answer is option C.
120. Deoiling is the process of removal of oil from wax. It is done by the __________ process.
solvent extraction
sweating
resettling
all (a), (b) & (c)
✅ The correct answer is option D.