261. In sweetening process, solutizer agent used with caustic alkali is potassium isobutyrate sodium plumbite methanol phenol ✅ The correct answer is option A.
262. Isomerisation converts the __________ tot-paraffins. paraffins olefins naphthenes none of these ✅ The correct answer is option A.
263. Pick out the correct statement pertaining to catalytic cracking. With increase in the reactor pressure, octane number of gasoline decreases. With increase in the reactor temperature, gasoline yield decreases for a given conversion. Percentage conversion increases with increase in the catalyst to oil ratio. all (a), (b) and (c). ✅ The correct answer is option D.
264. Both asphalt and wax are produced by __________ base crude oils. naphthenic asphalt paraffin mixed ✅ The correct answer is option D.
265. Which of the following processes in oil refinery does not employ ‘cracking’ ? Coking Visbreaking Pyrolysis None of these ✅ The correct answer is option D.
266. Which of the following is the most widely used cracking process in oil refineries ? Dubbs process. T.C.C. moving bed process. Fluidised bed catalytic cracking process. Houdry’s fixed bed process. ✅ The correct answer is option C.
267. Specific gravity of a petroleum product gives an indication of its degree of refinement. hydrocarbon content type (aromatic or paraffinic). ease of atomisation. sulphur content. ✅ The correct answer is option B.
268. Clay treatment is used to remove salt from the crude oil. colour & dissolved gases from cracked gasoline. wax from lube oil. none of these. ✅ The correct answer is option B.
269. __________ converts n-paraffins to i-paraffins. Alkylation Polymerisation Isomerisation none of these ✅ The correct answer is option C.
270. Which of the following has maximum hydrogen/carbon ratio (by weight) ? Naphtha Gasoline Diesel Fuel oil ✅ The correct answer is option B.