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

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Measurement and Instrumentation
Which of following is not correct?

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

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