231. A multigrade lubricating oil means an oil having high
viscosity index
viscosity
aniline point
flash point
✅ The correct answer is option A.
Petroleum Refinery Engineering MCQs
232. Reforming converts
olefins into paraffins
naphthenes into aromatics
naphthenes into olefins.
naphthenes into paraffin.
✅ The correct answer is option B.
233. Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).
5-Oct
30-80
150-250
350-400
✅ The correct answer is option B.
234. Higher vapour pressure of gasoline indicates
low flash point
high breathing loss
both (a) and (b)
neither (a) nor (b)
✅ The correct answer is option D.
235. Which of the following has the highest flash point of all ?
Diesel
Kerosene
Petrol
Furnace oil
✅ The correct answer is option D.
236. Tetra-ethyl lead is added in gasoline to
increase its smoke point.
reduce gum formation.
reduce the pour point.
increase its octane number.
✅ The correct answer is option D.
237. Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of
thermal cracking
gum formation
coking
discoloration
✅ The correct answer is option C.
238. Petroleum deposits are detected by the.
oil seepage at the surface of the earth.
measuremet of density, elasticity and magnetic & electric properties of the rock in the crust of the earth.
age & nature of rocks inside the crust of the earth.
all (a), (b) and (c)
✅ The correct answer is option D.
240. Carbon percentage (by weight) in crude petroleum may be about
65
75
85
95
✅ The correct answer is option C.