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What is the dielectric strength, coefficient of thermal expansion of glass with respect to porcelain insulators?

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in Design of Electrical Machines by (687k points)
What is the dielectric strength, coefficient of thermal expansion of glass with respect to porcelain insulators?

(a) High, high

(b) High, low

(c) Low, low

(d) Low, high

This question was addressed to me in examination.

The query is from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines

1 Answer

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The correct answer is (b) High, low

Explanation: Glass has a higher dielectric strength (140 kV/cm) when compared to porcelain (60 kV/cm) and glass has a lower coefficient of thermal expansion when compared to porcelain.

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