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Pour point of fuel oil is the
  • a)
    Minimum temperature to which oil is heated to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame.
  • b)
    Temperature at which it solidifies or congeals.
  • c)
    Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off.
  • d)
    Temperature at which it flows easily.
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Pour point of fuel oil is thea)Minimum temperature to which oil is he...
The pour point is that temperatures just about which the oil sample will not flow under certain prescribed conditions. In other words, the pour point of a liquid is the temperature below which the liquid loses its flow characteristics.
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Most Upvoted Answer
Pour point of fuel oil is thea)Minimum temperature to which oil is he...
Explanation:

The correct answer is option 'B': The pour point of fuel oil is the temperature at which it solidifies or congeals. Here is a detailed explanation of why this is the correct answer:

What is Fuel Oil?
Fuel oil is a type of petroleum product that is derived from crude oil through a refining process. It is commonly used as a fuel in various industries, including power generation, heating, and marine applications. Fuel oil is classified into different grades based on its viscosity and composition, such as No. 2 fuel oil, No. 4 fuel oil, and No. 6 fuel oil.

Importance of Pour Point
The pour point of fuel oil is an important property that determines its ability to flow and be pumped at low temperatures. It indicates the temperature at which the oil starts to solidify or congeal, leading to a significant increase in viscosity and a decrease in fluidity. A higher pour point means that the oil becomes more viscous and less fluid at lower temperatures, making it challenging to handle and use.

Other Options Explained
Let's examine the other options provided and understand why they are not the correct answers:

a) Minimum temperature to which oil is heated to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame: This option refers to the flash point of fuel oil, which is the minimum temperature at which it produces enough vapors to ignite when exposed to an open flame. It is not related to the pour point.

c) Indicated by 90% distillation temperature, i.e., when 90% of the sample oil has distilled off: This option refers to the distillation temperature, which is the temperature at which a certain percentage of the fuel oil has evaporated during the distillation process. It is not related to the pour point.

d) Temperature at which it flows easily: This option refers to the viscosity of fuel oil, which represents its resistance to flow. While the pour point is related to the ability of the oil to flow, it specifically indicates the temperature at which it starts to solidify or congeal, not when it flows easily.

Conclusion
In conclusion, the correct answer is option 'B': The pour point of fuel oil is the temperature at which it solidifies or congeals. This property is crucial for determining the low-temperature performance and handling characteristics of fuel oil.
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Pour point of fuel oil is thea)Minimum temperature to which oil is heated to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame.b)Temperature at which it solidifies or congeals.c)Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off.d)Temperature at which it flows easily.Correct answer is option 'B'. Can you explain this answer?
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