Discussion :: Passive Filters - General Questions (Q.No.2)
|Shrutali said: (Sep 1, 2011)|
|How to find critical frequency in this problem ?|
|Asha said: (Oct 15, 2011)|
|Shankarling.Patil said: (Apr 27, 2012)|
|What is critical frequency. Please tell me friends.|
|Naga Mallesh said: (Jul 27, 2012)|
|When R = XL its called critical frequency.|
|Shahul said: (Apr 5, 2013)|
|Critical frequency/Bandwidth = R/ (2*3. 14*L).|
|Jon said: (Sep 22, 2013)|
|Using R = XL.
Then R = 2*pie*freq*L.
Freq. = R/(2*pie*L).
Freq. = 93,787 Hz or 93.8 KHz.
|Pesce said: (Apr 26, 2015)|
|Critical frequency is a frequency at which I is maximum in RLC circuit.
i.e, when R=sqrt (XL*XL-Xc*Xc).
Here, Xc = 0 (since RC ckt).
R = XL.
But XL = 2*pie*f*L.
Hence R = 2*pie*f*L.
F = R/2*pie*L.
|Mshal said: (Feb 15, 2016)|
|At Resonant state of series RLC circuit, Z = R = (XL-XC).
Since R & L are given, R = XL but XL = 2*π*F*L.
Therefore 3.3k ohms = 2*3.1416*F*5.6 millihenry;
F = 93.78 HZ.
|Sana said: (Jul 8, 2016)|
|Is critical and cut off frequency are same?|
|Sonu Kumar said: (Apr 1, 2018)|
= 93835hz or,
|Haris said: (Jan 6, 2020)|
Critical frequency is the highest magnitude of frequency above which the waves penetrate the ionosphere and below which the waves are reflected back from the ionosphere.
Ionosphere: The layer of the earth's atmosphere which contains a high concentration of ions and free electrons and is able to reflect radio waves.
CUT OFF FREQUENCY: It is a level above or below at which the system fails to operate.
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