This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Paraffin and Asphaltene Chemistry”.
1. What is paraffin or wax?
a) Any inorganic deposit associated with crude production
b) Water associated with crude production
c) Any organic deposit associated with crude production
d) Gas associated with water production
View Answer
Explanation: Paraffin or wax is the organic deposits that come along with the crude during the production phase. i.e. Any organic deposit associated with crude production is often termed as paraffin or wax.
2. What is the range of melting point of paraffin deposits having a carbon chain length of 20 to 60?
a) 215°F to 500°F
b) 198°F to 215°F
c) 50°F to 215°F
d) 98°F to 215°F
View Answer
Explanation: The paraffin deposits generally have a carbon chain length of 20 to 60. So, for the carbon chain having a length of 20 generally has a melting point of about 98°F and the carbon chain having a length of 60 generally has a melting point of about 215°F.
3. What is the range of the size of the asphaltic particles?
a) 30 to 85 angstroms
b) 30 to 65 angstroms
c) 130 to 185 angstroms
d) 130 to 155 angstroms
View Answer
Explanation: The range of the size (diameter) of the asphaltic particles is 30 to 65 angstroms. These asphaltic particles are generally spherical in shape with densities ranges up to 1.22 g/cc.
4. Cloud point described in the oil and gas industry is the temperature (minimum), at which the lubricant under consideration coverts to semi solid and in fact the lubricant losses its flow properties.
a) True
b) False
View Answer
Explanation: The statement is False. The corrected statement is that the pour point is the minimum temperature at which a lubricant turns into semi-solid and almost losses its flow characteristics.
5. What is Cloud point in the petroleum industry?
a) It is the pressure above which wax in diesel forms a cloudy appearance
b) It is the temperature above which wax in diesel forms a cloudy appearance
c) It is the pressure below which wax in diesel forms a cloudy appearance
d) It is the temperature below which wax in diesel forms a cloudy appearance
View Answer
Explanation: In the petroleum industry, the Cloud point is the temperature below wax in diesel or bio-wax in biodiesels forms a cloudy appearance. It is the temperature at which the crystals of solid biodiesel first become visible.
6. ASTM D-2500-66 details the method of determining the cloud point of the oil.
a) True
b) False
View Answer
Explanation: The statement is true. ASTM D-2500-66 details the method of determining the cloud point of the oil. In the petroleum industry, the Cloud point is the temperature below wax in diesel or bio-wax in biodiesels forms a cloudy appearance. It is of immense importance in the transportation of oils.
7. Which of the following method should be used to estimate the pour point of oil in the petroleum industry?
a) ASTM A 97-66
b) ASTM D 97-66
c) ASTM C 2500-66
d) ASTM D 2500-66
View Answer
Explanation: ASTM D 97-66 should be used to estimate the pour point of oil in the petroleum industry. ASTM stands for American society for testing and materials. They design the technical standards of different types of services, products, materials, and systems.
Sanfoundry Global Education & Learning Series – Petroleum Production Operations.
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