251. Cetane number of a diesel fuel is the measure of its
ignition delay
smoke point
viscosity
oxidation stability
✅ The correct answer is option A.
Petroleum Refinery Engineering MCQs
252. Sour crude means the __________ bearing crude.
asphalt
sulphur compounds
wax
nitrogen compounds
✅ The correct answer is option B.
253. Octane number (unleaded) of gasoline produced by isomerisation of butane may be about
45
55
70
90
✅ The correct answer is option C.
254. Clay treatment of petroleum products
decolorises & stabilises cracked gasoline.
desulphurise straight run gasoline & kerosene.
adsorb arsenic from feedstock to catalytic reforming.
all (a), (b) & (c).
✅ The correct answer is option D.
255. Reforming
uses naphtha as feedstock.
does not much affect the molecular weight of the feed.
improves the quality & yield of gasoline.
all (a), (b) and (c).
✅ The correct answer is option D.
256. True boiling point apparatus is used for the
determination of characterisation factor.
evaluation of oil stocks.
determination of true vapour pressure.
none of these.
✅ The correct answer is option B.
257. Mercaptans is represented as (where R and R’ are alkyl groups)
R-COOH
R-S-H
R-S-R
R-S-R’
✅ The correct answer is option B.
258. Which of the following is an additive used for improving the cetane number of diesel ?
Tetraethyl lead
Tetramethyllead
Ethyl nitrate or acetone
None of these
✅ The correct answer is option A.
259. The characterisation factor of a crude oil is calculated as 12.5. It means that; it is
paraffinic
naphthenic
intermediate
none of these
✅ The correct answer is option A.
260. Alkylation
causes olefins to combine with each other.
causes olefins to combine with iso-paraffins.
converts iso-paraffin into olefin.
converts olefin into paraffin.
✅ The correct answer is option B.