The ratio of
the puncture voltage to the flashover voltage of an insulator is
equal to one
lower than
one
zero
greater than
one
greater than
one
Flash over
voltage : The voltage at which the air around the insulator breaks down and
flash over takes 'ace shorting the insulator is called flash over voltage.
Puncture
voltage : The voltage at which the insulator breaks down and current flows
through the inside of insulator is called puncture voltage.
Puncture
voltage is more serious than flashover voltage.
Safety factor 
Hence, the
correct option is (D).
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