Electronics and Communication Engineering - Analog Electronics - Discussion

37. 

A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is RL and filter capacitance is C. For good output wave shape, the time constant RLC should be at least equal to

[A]. 10 ms
[B]. 20 ms
[C]. 50 ms
[D]. 100 ms

Answer: Option D

Explanation:

Time constant RLC must be about 5 x 20 ms.


Raj said: (Nov 26, 2014)  
Why 5*20 ms tell me?

Meenu said: (Dec 26, 2015)  
Time = 1/frequency = 1/50 = 20 msec.

Capacitor fully charge time = 5xTime.

Rc = 5x20 ms = 100 msec.

Chunilal said: (Jan 19, 2016)  
Why 5 and not any other number?

Mahesh Kumar said: (Jan 3, 2017)  
In bridge rectifier, to get good output it must have 5-time constants i.e 5 RLC.

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