Electrical Engineering - Passive Filters - Discussion

Discussion :: Passive Filters - General Questions (Q.No.14)


A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is

[A]. 18 V peak-to-peak
[B]. zero
[C]. 9 V peak-to-peak
[D]. 12.74 V peak-to-peak

Answer: Option B


No answer description available for this question.

Sandy said: (Jan 19, 2015)  
Xc = 1/2pifc.

RC low pass filter is connected in series combination.

I/p frequency is zero, so o/p becomes infinity reactance. Hence there is no o/p voltage.

Kuldeep Kumar said: (Aug 28, 2015)  
RC low pass filter only allow low frequency signals like DC signal.

Muhammad Asif Latif said: (Aug 15, 2016)  
In RC low pass filter output is taken across the capacitor. So when Xc is zero as given in problem the voltage across the capacitor will be zero. Answer B is correct.

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