Measurement and Instrumentation
The spring material used in a spring control device should have the following property.

All of the listed here
Most be of low temperature co-efficient
Should have low specific resistance
Should non magnetic

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Measurement and Instrumentation
It can be stated that

CT operates with a higher flux density than PT
CT operates with considerably lower flux density than a PT
CT operates at almost the same flux density as a PT
No generalisation can be made with regard to the flux densities in CT and PT

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