131. Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic
cracking
polymerisation
reforming
isomerisation
✅ The correct answer is option C.
Petroleum Refinery Engineering MCQs
132. Flash point of motor gasoline may be around __________ °C.
10
45
100
150
✅ The correct answer is option B.
133. The solvent used in Barisol dewaxing process is
hexane
furfural
benzol and ethylene dichloride
methyl ethyl ketone (MEK)
✅ The correct answer is option C.
134. Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to
increase the yield of light distillates.
suppress coke formation.
enhance the octane number of gasoline.
reduce gum content in gasoline.
✅ The correct answer is option B.
135. Flash point of diesel/kerosene (>50°C) is determined by the
Abel apparatus
Pensky-Martens apparatus
Saybolt chromometer
none of these
✅ The correct answer is option B.
136. Feed for reforming is generally
naphtha or straight run gasoline.
reduced crude.
vacuum gas oil.
atmospheric gas oil.
✅ The correct answer is option A.
137. Petroleum coke is used mainly .in the
discoloration of yellow glycerine.
sugar refining.
manufacture of carbon electrode.
blast furnace for reduction of iron ore.
✅ The correct answer is option C.
138. In catalytic cracking process, olefins crack __________ times faster than in thermal cracking process.
100
200-300
1000-10000
10
✅ The correct answer is option C.
139. Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about __________ ppm.
1
50
5000
10000
✅ The correct answer is option B.
140. During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) __________ with increase in the amount of water.
decreases
increases
remains unchanged
decreases linearly
✅ The correct answer is option B.