Measurement and Instrumentation
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

One of the wattmeter connections will have to be reversed
Pressure coil of the wattmeter will become ineffective.
Both give the same readings
One of the wattmeters will read zero

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

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