Which of the following is correct related to properties of good of good insulating material?

Having high dielectric strength, very low dissipation factor, and high operating temperature limit

Concept:

• High dielectric strength: This means that the insulator can withstand a high voltage without getting damaged or allowing current to pass through it. The dielectric strength often determines the maximum voltage that can be applied across the insulator for it to still function effectively. This is a desirable property in an insulator as it ensures the material won't fail under high voltage conditions.
• Very low dissipation factor: The dissipation factor is a measure of loss rate of energy of a mode of oscillation (mechanical, electrical, or electromechanical) in a dissipative system. In the context of insulation, a low dissipation factor is desirable because it means that little energy is lost as heat within the insulator. High energy losses can lead to decreased efficiency of the system and potential overheating.
• High operating temperature limit: This means the insulator can withstand high temperatures without its properties degrading. Many electrical systems produce heat and an insulator used in these systems should be able to sustain high temperatures. If an insulator cannot withstand high temperatures, it may fail or not provide effective insulation.

Therefore, for an insulating material to be considered 'good' or effective, it needs to possess high dielectric strength, a very low dissipation factor, and a high operating temperature limit.