Petroleum Refinery Engineering

181. Presence of aromatics in

1. Diesel increases its cetane number
2. Kerosene increases its smoke point
3. Petrol increases its octane number
4. All (A), (B) and (C)

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182. Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has

1. High pour point and low smoke point
2. Low viscosity index
3. High self-ignition temperature
4. All (A), (B) and (C)

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183. Presence of sulphur in gasoline

1. Leads to corrosion
2. Increases lead susceptibility
3. Decreases gum formation
4. Helps during stabilisation

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184. Pressure & temperature maintained in catalytic cracking is about

1. 2 atm & 500°C
2. 10 atm & 500°C
3. 30 atm & 200°C
4. 50 atm & 750°C

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185. Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about _________ kg/cm².

1. 1.5
2. 3
3. 6
4. 12

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186. Products drawn from the top to bottom of the crude oil distillation column has progressively increasing

1. Boiling points
2. Molecular weight
3. C/H ratio
4. All (A), (B) and (C)

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187. Pyrolysis of kerosene or natural gasoline is done to produce mainly the

1. Olefins and aromatics
2. Lighter paraffins
3. Stabilised gasoline
4. Diesel

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188. Quinoline is a/an _________ compound.

1. Sulphur
2. Nitrogen
3. Oxygen
4. None of these

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189. Raw Kerosene has a smoke point of 15 mm. After it is subjected to dearomatization by liquid SO2 extraction (Edeleanu process), its smoke point may become _________ mm.

1. 5
2. 10
3. 25
4. 100

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190. Reforming

1. Uses naphtha as feedstock
2. Does not much affect the molecular weight of the feed
3. Improves the quality & yield of gasoline
4. All (A), (B) and (C)

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