Petroleum Refinery Engineering

251. 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

1. Increase the yield of light distillates
2. Suppress coke formation
3. Enhance the octane number of gasoline
4. Reduce gum content in gasoline

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252. True boiling point apparatus is used for the

1. Determination of characterisation factor
2. Evaluation of oil stocks
3. Determination of true vapour pressure
4. None of these

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253. True vapour pressure of a petroleum fraction _________ Reid vapour pressure.

1. Is less than
2. Is more than
3. Is same as
4. May be either more or less than

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254. Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about _________ mm Hg absolute.

1. 1 to 5
2. 30 to 80
3. 250 to 350
4. 450 to 500

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255. Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about _________ mm Hg (absolute).

1. 44109
2. 30-80
3. 150-250
4. 350-400

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256. Visbreaking

1. Uses natural gas as feed
2. Is carried out at atmospheric pressure
3. Produces fuel oil of lower viscosity
4. Produces gasoline only

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257. Visbreaking process is used mainly for making

1. High cetane diesel
2. High octane gasoline
3. Fuel oil
4. Smoke free kerosene

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258. Viscosity index of a lubricating oil

1. Is the measure of its flash point
2. Is the measure of variation of viscosity with temperature
3. Should be low
4. None of these

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259. Water content in the crude oil as it comes out of oil well may be upto _________ percent.

1. 2
2. 5
3. 10
4. 25

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260. Water separometer index (modified) (WSIM) of a petrofuel is the measure of its

1. Emulsification tendency
2. Water separation characteristics
3. Water content
4. Water absorbing capacity from atmosphere

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