Discussion
Insulators for high voltage applications are tested for:
Answer: C
High-voltage insulators are tested by Both A and B: power frequency tests and impulse tests.
In service an insulator must withstand the normal power-frequency voltage, including temporary overvoltages, under dry and wet conditions, which is what power frequency withstand and flashover tests check. It must also survive lightning and switching surges, which impulse tests reproduce with a standard steep-fronted voltage wave.
Either test alone covers only one kind of stress, so neither single option, and certainly not 'None of the above', is complete.
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