Petroleum Refinery Engineering

71. Diesel index is defined as

1. (°API) × (Aniline Point, °F)/100
2. (°API) × (Aniline Point, °C)/100
3. (°API) × (100)/Aniline Point, °F
4. (°API) × (100)/Aniline Point, °C

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72. Diesel used in naval applications has a minimum cetane number of

1. 25
2. 35
3. 45
4. 65

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73. During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) _________ with increase in the amount of water.

1. Decreases
2. Increases
3. Remains unchanged
4. Decreases linearly

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74. Electrical desalting of crude oil removes the _________ impurities.

1. Oleophilic
2. Oleophobic
3. Both (A) and (B)
4. Neither (A) nor (B)

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75. Equal volumes of aniline and diesel oil when mixed at room temperature (during summer) was found to be completely miscible. It means that the aniline point of the diesel is _________ the room temperature.

1. More than
2. Less than
3. Same as
4. Either more or less; depends on the room temperature

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76. Ethyl mercaptan is a/an _________ compound.

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

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77. Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about _________ ppm.

1. 1
2. 50
3. 5000
4. 10000

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78. Extractor temperature is maintained at -20°C in Edeleanu process to reduce the _________ of kerosene.

1. Smoke point
2. Paraffins
3. Aromatics
4. Naphthenes

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79. Feed for reforming is generally

1. Naphtha or straight run gasoline
2. Reduced crude
3. Vacuum gas oil
4. Atmospheric gas oil

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80. Feedstock for polymerisation is

1. Naphtha
2. Cracked gases rich in C2 & C4 olefins
3. Low boiling aromatics
4. None of these

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