Measurement and Instrumentation
If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms

 The bridge is balanced for some specified value of frequency.
 The bridge can be balanced.
 The bridge can not be balanced.
 The bridge is balanced for some specified value of R1, R2, R3.

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

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