Q.

How can corrosion be prevented in a resistance thermometer?

A. by immersing the setup in oil
B. by enclosing the elements in a glass tube
C. by using guard rings
D. by painting the elements
Answer» B. by enclosing the elements in a glass tube
Explanation: corrosion can be eliminated in a resistance thermometer by enclosing the elements in a protective tubular glass made of pyrex, quartz or crystal depending upon the temperature range.
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