Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion

42. 

A periodic voltage has following value for equal time intervals changing suddenly from one value to next... 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10 etc. Then rms value of the waveform is

[A]. 31 V
[B]. 32 V
[C]. insufficient data
[D]. none of these

Answer: Option A

Explanation:

RMS value = 965 = 31.064 Volt.


Dushyant said: (Sep 4, 2014)  
Why last three value not taken in count?

Ravi said: (Mar 22, 2016)  
Because rms value calculated for +ve cycle.

Rathi said: (Jun 11, 2016)  
Why there is 10 on the denominator?

Srivani said: (Jun 13, 2016)  
@Rathi.

Because there are 10 positive cycles on the numerator.

Balwinder S said: (Aug 17, 2016)  
I think it should be simply,

Vmax / 1.414. Vmax = 60v.

Manjusihag said: (Sep 1, 2016)  
Vmax = 60 then Vrms = 0.5,

Multiply by 60 = 30,

The answer due to +ve half cycle.

Mohsin said: (Jan 1, 2017)  
Why? (Vrms =0.5).

Mukul said: (Apr 4, 2018)  
Why vm/√2 is not taken here? Please explain.

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