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Electrical and electronics measurements miscellaneous

Electrical and Electronics Measurements

  1. For the ac bridge circuit shown in the figure at balance, the value of Rd, Ld and Qd will be respectively
    1. Ra
      Rb;
      RaRc
      ;ωCbRb
      RcCb
    2. Rb
      Rc;
      RaRc
      ;ωCbRb
      RaCb
    3. Rb
      Rc;RaRcCb;ωCbRc
      Ra
    4. Ra
      Rc;RaRcCb;ωCbRb
      Rb
Correct Option: D

From balance condition

RaRc = (RdjωLd
R
1 + lωcbRb

or (1 + ωcbRb)RaRc = Rb(Rd + jωLd
or RbRd = RaRc
∴ Rd =
RaRc
Rb

and ωCbRbRc = ωRbLd
or Ld = RaRcCb



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