Petroleum Refinery Engineering

261. Waxes present in petroleum products

1. Can be separated out by distillation
2. Are not soluble in them
3. Crystallise out at low temperature
4. Decrease their viscosity

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262. Waxy crudes are treated with chemical additives mainly to

1. Depress its pour point
2. Dissolve wax
3. Precipitate wax
4. Remove wax

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263. Which is almost absent in crude petroleum?

1. Olefins
2. Mercaptans
3. Naphthenes
4. Cycloparaffins

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264. Which is an anticing compound?

1. Amyl nitrate
2. Alcohols
3. Mercaptans
4. Pyridine

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265. Which is the most desirable component of a good quality kerosene?

1. i-paraffins
2. Aromatics
3. n-paraffins
4. Naphthenes

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266. Which is the most undesirable component in kerosene?

1. Aromatics
2. i-paraffins
3. n-paraffins
4. Naphthenes

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267. Which of the following additives improves the cetane number of diesel?

1. Amyl nitrate
2. Ethyl mercaptan
3. Naphthenic acid
4. Tetra ethyl lead

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268. Which of the following categories of gasoline has the highest lead susceptibility?

1. Straight run gasoline
2. Platinum reformed gasoline
3. Catalytical cracked gasoline
4. Polymer gasoline

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269. Which of the following constituents present in petroleum is responsible for ash formation?

1. Nitrogen compounds
2. Organometallic compounds
3. Sulphur compounds
4. Oxygen compounds

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270. Which of the following contains maximum sulphur?

1. Diesel
2. Petrol
3. Kerosene
4. Fuel oil

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