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What is the dielectric strength of porcelain insulators?

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What is the dielectric strength of porcelain insulators?

(a) 60 kV/cm

(b) 140 kV/cm

(c) 50 kV/cm

(d) 40 kV/cm

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Question is from Insulating Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines

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The correct option is (a) 60 kV/cm

Easy explanation: Porcelain has a dielectric strength of 60kV/cm. 140 kV/cm denotes the dielectric strength of glass insulator.

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