Measurement and Instrumentation
It can be stated that

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

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Measurement and Instrumentation
The measurment of very low and very high frequencies is invariably done using a frequency counter in which one of the following?

 Period measurment modes only.
  Period and frequency measurement modes respectively.
 Frequency measurment modes only.
 Frequency and period measurment modes, respectively.

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