Overheating
of an insulator is due to________ between one metal part to the other this
causes unequal expansion of porcelain, shattering the insulator with cracking.
mechanical
stress
short-circuit
porosity
flash-over
flash-over
Overheating
of an insulator is due to over voltage between one metal part to the other this
causes unequal expansion of porcelain, thus shattering the insulator with
cracking.
Hence, the
correct option is (D).
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