Electrical Engineering - Passive Filters - Discussion
Discussion Forum : Passive Filters - General Questions (Q.No. 2)
2.
An RL low-pass filter consists of a 5.6 mH coil and a 3.3 k
resistor. The output voltage is taken across the resistor. The circuit's critical frequency is
resistor. The output voltage is taken across the resistor. The circuit's critical frequency isDiscussion:
11 comments Page 1 of 2.
HAris said:
6 years ago
No, @SANA.
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.
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.
(1)
Sonu kumar said:
7 years ago
F =R/2πL,
= 3300/2*3.14*.0056,
= 3300/6.28*.0056,
= 33*10^8/628*56,
= 33*10^8/35168,
= 93835hz or,
= 93.8khz.
= 3300/2*3.14*.0056,
= 3300/6.28*.0056,
= 33*10^8/628*56,
= 33*10^8/35168,
= 93835hz or,
= 93.8khz.
(1)
Sana said:
9 years ago
Is critical and cut off frequency are same?
Mshal said:
10 years ago
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.
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.
(1)
PESCE said:
1 decade ago
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).
So.
R = XL.
But XL = 2*pie*f*L.
Hence R = 2*pie*f*L.
F = R/2*pie*L.
i.e, when R=sqrt (XL*XL-Xc*Xc).
Here, Xc = 0 (since RC ckt).
So.
R = XL.
But XL = 2*pie*f*L.
Hence R = 2*pie*f*L.
F = R/2*pie*L.
(1)
Jon said:
1 decade ago
Using R = XL.
Then R = 2*pie*freq*L.
Freq. = R/(2*pie*L).
= 3300/(2*3.1416*.0056).
Freq. = 93,787 Hz or 93.8 KHz.
Then R = 2*pie*freq*L.
Freq. = R/(2*pie*L).
= 3300/(2*3.1416*.0056).
Freq. = 93,787 Hz or 93.8 KHz.
(1)
ShaHuL said:
1 decade ago
Critical frequency/Bandwidth = R/ (2*3. 14*L).
Naga mallesh said:
1 decade ago
When R = XL its called critical frequency.
Shankarling.patil said:
1 decade ago
What is critical frequency. Please tell me friends.
Asha said:
1 decade ago
Critical frequency=R/2*PIE*L
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