161. Testing of the knocking characteristics of petrofuels is done in a __________ engine.
Carnot
CFR (Co-operative fuel research)
Stirling
diesel
✅ The correct answer is option B.
Petroleum Refinery Engineering MCQs
162. Molecular weight of crude oil is in the range of
100-120
230-250
450-550
600-850
✅ The correct answer is option B.
163. With increase in density, the viscosity of petroleum products
increases
decreases
remains same
either (a) or (b)
✅ The correct answer is option A.
164. Petroleum liquid fuels having flash point greater than 66°C is considered as safe during storage and handling. Which of the following has flash point > 66°C ?
Naphtha
Petrol
Kerosene
Heavy fuel oil
✅ The correct answer is option D.
165. Salt content (measured as sodium chloride) in electrically desalted crude oil comes down to a level of about __________ ptb (pounds per thousand barrel).
0.03
3
35
70
✅ The correct answer is option B.
166. True vapour pressure of a petroleum fraction __________ Reid vapour pressure.
is less than
is more than
is same as
may be either more or less than
✅ The correct answer is option B.
167. Hydrogen percentage (by weight) in crude petroleum may be about
5
15
25
35
✅ The correct answer is option B.
168. Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has
high pour point and low smoke point.
low viscosity index.
high self-ingnition temperature.
all (a), (b) and.(c).
✅ The correct answer is option B.
169. The main use of heavy gas oil produced by the vacuum distillation unit is as a
blending component for kerosene.
blending component for petrol.
feedstock for fluid catalytic cracking unit.
none of these.
✅ The correct answer is option C.
170. Which of the following is not a sulphur compound present in petroleum ?
Thiophenes
Mercaptans
Sulphones
Pyroles
✅ The correct answer is option D.