The flash point of transformer oil should be higher than

The correct answer is: D. 104°C

The flash point of a liquid is the lowest temperature at which it gives off enough vapor to form an ignitable mixture with air near the surface of the liquid. If the temperature of a liquid is raised above its flash point, it can ignite if it comes into contact with a source of ignition, such as a spark or flame.

Transformer oil is a type of oil that is used to insulate and cool transformers. It is important for transformer oil to have a high flash point so that it does not ignite easily. If transformer oil ignites, it can cause a fire or explosion that can damage the transformer and other equipment.

The flash point of transformer oil is typically specified by the manufacturer. The minimum flash point for transformer oil is typically 104°C. However, some manufacturers may specify a higher flash point for their transformer oil.

It is important to check the flash point of transformer oil before using it. If the flash point of the oil is too low, it may not be safe to use. If you are unsure of the flash point of the oil, you should contact the manufacturer.

Here is a brief explanation of each option:

• Option A: 40°C. This is too low of a flash point for transformer oil. If the temperature of the oil is raised above 40°C, it can ignite if it comes into contact with a source of ignition.
• Option B: 60°C. This is a higher flash point than Option A, but it is still not high enough for transformer oil. If the temperature of the oil is raised above 60°C, it can ignite if it comes into contact with a source of ignition.
• Option C: 80°C. This is a higher flash point than Option B, but it is still not high enough for transformer oil. If the temperature of the oil is raised above 80°C, it can ignite if it comes into contact with a source of ignition.
• Option D: 104°C. This is the minimum flash point for transformer oil. If the temperature of the oil is raised above 104°C, it can ignite if it comes into contact with a source of ignition. However, some manufacturers may specify a higher flash point for their transformer oil.