depress its pour point
dissolve wax
precipitate wax
remove wax
✅ The correct answer is option A.
Petroleum Refinery Engineering MCQs
302. Solvent deoiling process is used for separating oil and soft wax from hard wax. Methyl iso-butyl ketone and methyl ethyl ketone (MEK) are two commonly used deoiling solvents. Use of former as the deoiling solvent has the advantages of the
elimination of solvent drying facility.
higher nitration temperature.
lower solvent dilution ratio.
all (a), (b) & (c).
✅ The correct answer is option D.
303. Which of the following has the highest octane number ?
Aromatics
i-paraffins
Naphthenes
Olefins
✅ The correct answer is option A.
304. Removal of light fractions from crude oil is called its
sweetening
dehydration
stabilisation
visbreaking
✅ The correct answer is option C.
305. Catalytic desulphurisation process used for sweetening of straight run gasoline and kerosene uses __________ as catalyst.
bauxite
fuller’s earth
activated clay
all (a), (b) & (c)
✅ The correct answer is option D.
306. Tanks used for the storage of petroleum products (which are inflammable) should be painted with a __________ paint.
black
white
red
yellow
✅ The correct answer is option B.
307. Which is an anticing compound ?
Amyl nitrate
Alcohals
Mercaptans
Pyridine
✅ The correct answer is option B.
308. Carbon/hydrogen ratio (by weight) is maximum (out of following) for
gasoline
kerosene
light gas oil
heavy fuel oil
✅ The correct answer is option A.
309. __________ base crude oil is also called asphaltic crude.
Paraffinic
Naphthenic
Mixed
Aromatic
✅ The correct answer is option B.
310. In hydrofining catalytic desulphurisation process for sweetening of petroleum products, use of hydrogen
enhances the desulphurisation process.
minimises coke formation.
both (a) and (b).
neither (a) nor (b).
✅ The correct answer is option C.