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, highThis question was addressed to me in examination.The query is from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines

What is the dielectric strength, coefficient of thermal expansion of g

1.	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, highThis question was addressed to me in examination.The query is from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» 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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