Which of the following is not a constituent for making porcelain insulators ?
Correct answer: D. Silica
- A. Quartz
- B. Kaolin
- C. Felspar
- D. Silica
Explanation
Porcelain insulators are commonly made from kaolin, feldspar and quartz. Silica is chemically related to quartz, but it is not normally listed as a separate constituent in the standard formulation.
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