SSC JE Electrical Engineering 2014 Set 2 Paper

Question : 149 of 200

Marks: +1, -0

In a series resonance circuit, the impedance at half power frequencies is :

Solution:

In Series Resonance Circuit

Z = R =V /I =V/I_m

Whereas at half power frequency,

I = I_m/ √2

Now impedance at half power frequencies

=V/(I_m/ √2)=√2V/I_m=√2R

∴ Option (c) is correct.

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