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?

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

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Measurement and Instrumentation
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,

 2 represents greater precision but 1 and 3 represent same precision.
 2 and 3 represent greater precision than 1.
 1 represents greater precision than 2 and 3.
 1, 2 and 3 represent same precision.

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Measurement and Instrumentation
It can be stated that

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

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