chemical engineering petroleum refinery engineering Mcqs
201. The main use of heavy gas oil produced by the vacuum distillation unit is as a_____________________?
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A. Blending component for kerosene

B. None of these

C. Blending component for petrol

D. Feedstock for fluid catalytic cracking unit
202. Catalyst used in isomerisation process is __________________ ?
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A. AlCl3

B. H2SO4

C. HF

D. H3PO4

203. Name the hydrocarbon having the poorest oxidation stability ?
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A. Naphthene

B. Aromatics

C. Paraffin

D. Olefin

204. Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has__________________?
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A. High self-ignition temperature

B. High pour point and low smoke point

C. Low viscosity index

D. All A., B. and C.

205. Petroleum ________________ ?
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A. Constitutes mainly of olefins

B. Does not contain asphalt

C. Is optically active

D. Does not contain aromatics

206. Which of the following tests is not done for transformer oil ?
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A. Copper strip corrosion test

B. Flash point and acid value

C. Dielectric strength

D. Aniline point
207. Which of the following has the highest viscosity of all (at a given temperature) ?
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A. Fuel oil

B. Naphtha

C. Light diesel oil

D. Petrol

208. Ethyl mercaptan is a/an ___________________ compound?
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A. Oxygen

B. None of these

C. Sulphur

D. Nitrogen

209. Solvent used in the deasphalting process is ______________________?
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A. Furfural

B. Hexane

C. Propane

D. Phenol

210. Pick out the undesirable property for a solvent meant for dewaxing of lube oil ?
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A. Complete miscibility with oil

B. High solubility of wax in the solvent

C. Both A. and B.

D. Neither A. nor B.

211. Research octane number refers to the___________________?
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A. Unleaded motor fuels

B. Low octane number motor fuels

C. High octane number motor fuels

D. High octane number aviation fuels

212. LPG when brought to atmospheric pressure & temperature will be a________________?
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A. Liquid lighter than water

B. Gas heavier than air

C. Gas lighter than air

D. Liquid heavier than water

213. Tanks used for the storage of petroleum products (which are inflammable) should be painted with a ______________ paint?
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A. Yellow

B. Black

C. Red

D. White
214. Which of the following gasoline (unleaded) has the least octane number ?
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A. Catalytically reformed gasoline

B. Polymer gasoline

C. Straight run gasoline

D. Catalytically cracked gasoline

215. The order of preference for feedstock to a catalytic reformer is _________________ ?
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A. Virgin naphtha catalytic naphtha coking naphtha

B. Catalytic naphtha coking naphtha virgin naphtha

C. Coking naphtha virgin naphtha catalytic naphtha

D. Virgin naphtha coking naphtha catalytic naphtha

216. Which is almost absent in crude petroleum ?
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A. Cycloparaffins

B. Mercaptans

C. Naphthenes

D. Olefins

217. Which of the following contains maximum sulphur ?
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A. Diesel

B. Petrol

C. Kerosene

D. Fuel oil
218. Flash point of an oil is determined by the _____________________?
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A. Pensky Martens apparatus

B. Conradson apparatus

C. Saybolt viscometer

D. Ramsbottom apparatus

219. Concentration of H2SO4 catalyst in alkylation is kept between 90-98%, because H2SO4 having concentration?
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A. Less than 90% promotes polymerisation

B. More than 98% promotes cracking

C. Both A. and B.

D. Neither A. nor B.

220. Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about ______________ kg/cm2?
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A. 1.5

B. 12

C. 3

D. 6

221. Maximum sulphur percentage in low sulphur heavy stock (LSHS) furnace oil is about_________________?
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A. 2.5

B. 0.1

C. 3.5

D. 1
222. Older crude petroleum __________________?
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A. Gives more distillates

B. All A., B. and C.

C. Gives less tar

D. Is light and better

223. Alkylation_____________________?
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A. Converts olefin into paraffin

B. Converts iso-paraffin into olefin

C. Causes olefins to combine with each other

D. Causes olefins to combine with iso-paraffins
224. Which of the following is desirable in diesel and kerosene but is undesirable in gasoline ?
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A. Aromatics

B. Mercaptans

C. Paraffins

D. Naphthenic acid

225. Antioxidants are added in petrol to _____________________?
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A. Prevent the lead build up in engines

B. Minimise the gum formation

C. Impart colour to it, for easy identification

D. Prevent icing of the carburettor

226. The pressure (kg/cm2) and temperature (C) maintained in electrical desalters for crude oil are respectively__________________?
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A. 50 and 250

B. 10 and 300

C. 10 and 120

D. 1 and 200
227. Fuel oil is subjected to visbreaking to reduce its_______________?
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A. Viscosity

B. All A., B. and C.

C. Pour point

D. Pressure drop on pumping

228. Gasoline extracted from natural gas (by compression and cooling) is called the ___________ gasoline?
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A. Polymer

B. Casing head

C. Unleaded

D. Straight run

229. Crude oil produced by Indian oil fields are predominantly _______________ in nature?
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A. Mixed base

B. Asphaltic

C. Naphthenic

D. Paraffinic

230. Which of the following has the highest octane number ?
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A. Olefins

B. Aromatics

C. Naphthenes

D. i-paraffins

231. Aromatics are desired constituents of____________________?
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A. Kerosene

B. Petrol

C. Diesel

D. Lubricating oil

232. Which of the following has the minimum API gravity of all ?
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A. Diesel

B. Kerosene

C. Petrol

D. Furnace oil
233. Boiling range of motor gasoline is an indication of the ___________________?
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A. Vapour locking tendency

B. All A., B. and C.

C. Rate of acceleration

D. Case of starting

234. CnH2n is the general formula for_______________?
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A. Olefins

B. Naphthenes

C. Both A. and B.

D. Neither A. nor B.

235. Water content in the crude oil as it comes out of oil well may be upto ______________ percent?
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A. 25

B. 5

C. 2

D. 10

236. Salt content (measured as sodium chloride) in electrically desalted crude oil comes down to a level of about __________________ ptb (pounds per thousand barrel) ?
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A. 3

B. 35

C. 0.03

D. 70

237. The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to ____________________?
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A. Sustain the reactor pressure

B. Obviate catalyst poisoning

C. Maintain the reaction temperature

D. Hydrogenate the feed stock

238. In sweetening process, solutizer agent used with caustic alkali is_______________?
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A. Sodium plumbite

B. Phenol

C. Potassium isobutyrate

D. Methanol

239. _____________ base crude oil is also called asphaltic crude?
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A. Naphthenic

B. Paraffinic

C. Mixed

D. Aromatic

240. Carbon/hydrogen ratio (by weight) is maximum (out of following) for_________________?
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A. Kerosene

B. Gasoline

C. Light gas oil

D. Heavy fuel oil

241. Higher viscosity of lubricating oil usually signifies_______________________?
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A. Higher flash point and fire point

B. Lower flash point and fire point

C. Lower Reid vapour pressure

D. Higher acid number

242. Smoke volatility index is equal to smoke point plus______________________?
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A. 10 mm approximately

B. 0.42 (% distilled at 204C)

C. 5 mm

D. 0.84 (% distilled at 204C)

243. Which of the following has the highest gum forming tendency in gosoline ?
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A. Aromatics

B. Diolefins

C. Paraffins

D. Naphthenes

244. Pick out the correct statement pertaining to catalytic cracking ?
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A. With increase in the reactor pressure, octane number of gasoline decreases

B. All A., B. and C.

C. Percentage conversion increases with increase in the catalyst to oil ratio

D. With increase in the reactor temperature, gasoline yield decreases for a given conversion

245. Choose the correct statement?
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A. Coking tendency increases with increasing molecular weight

B. Coking tendency decreases with increasing molecular weight

C. Coking is an exothermic reaction

D. Higher pressure enhances coke formation

246. Which of the following is a type of sedimentary rock?
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A. All of the above

B. Organic rock

C. Clastic rock

D. Chemical rock

247. Which of the following is used as a solvent in deasphalting of petroleum products ?
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A. Methyl ethyl ketone

B. Furfural

C. Propane

D. Liquid sulphur dioxide

248. Crude oil is pumped by a _______________ pump?
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A. Gear

B. Centrifugal

C. Reciprocating

D. Screw

249. ______________ test is done to find out the softening point of bitumen?
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A. Flame

B. Viscosity

C. Impact

D. Ball and ring
250. Pick out the correct statement?
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A. Paraffins have lower smoke point than aromatics

B. Suitability of kerosene as a fuel & as an illuminant may be determined by char value test

C. Paraffins have higher octane number than corresponding iso-paraffin

D. Aviation fuel should have very high cloud point