Measurement and Instrumentation
The measurement of a quantity

 is a comparison of an unknown quantity with another quantity.
  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with known quantity.
 none of these.

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Measurement and Instrumentation
Which of following is not correct?

 An ammeter should have a very low resitance.
  An electronic voltmeter draw appreciable current from the source.
 A shunt should have a very low resistance.
 Voltmeter should have very high resistance.

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Measurement and Instrumentation
It can be stated that

CT operates with considerably lower flux density than a PT
CT operates with a higher flux density than 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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