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Electronic Measurements And Instrumentation

Electronic measurements and instrumentation miscellaneous
  1. In the ac bridge shown in the figure:
    where,
    Z1 = 450 ohm,
    Z2 = (300– j600) ohm,
    Z3 = (200 + j100) ohm.
    The value of unknown impedance Z4 at balance is:


    1. (100 + j150) ohm
    2. (100 – j150) ohm
    3. (300 + j150) ohm
    4. (0 + j150) ohm
Correct Option: D

Given, Z1 = 450Ω
Z2 = (300 – j600)Ω
Z3 = (200 + j100)Ω
Z4 =?
under balanced condition

Z1
 =
Z4
Z2Z3

or
Z4 =
Z1Z3
Z2

or
Z4 = 450
(200 + j100)
(300 – j600)

or
Z4 = (0 + j150)Ω (After simplifying)


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