Correct Answer : Option (C) : 140 degree
Explanation : Usually, transformer oil has excellent insulating properties so that it is capable of withstanding high temperature. The Flashpoint of a transformer refers to the lowest temperature at which transformer oil gives vapor.
Its primary function is to determine the self-ignition temperature of oil for safety reasons.
The flashpoint of the transformer is directly proportional to the safe operation of the transformer.
It means the higher the flash point value safer the operation. If the flash point value is lower than the specified value, the risk of fire in the transformer increases.
