Electrical Engineering - RC Circuits - Discussion

Discussion :: RC Circuits - General Questions (Q.No.14)

14. 

An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:

[A]. R = XC
[B]. R > XC
[C]. R < XC
[D]. R = 5XC

Answer: Option C

Explanation:

No answer description available for this question.

Danmarch said: (Jan 2, 2012)  
Phase angle = tan-1(Xc/R), So Xc must be greater than R.

Mayur said: (Dec 19, 2014)  
Capacitor inject the reactive power.

Nag said: (Dec 7, 2015)  
For pure capacitor angle = 90.

If R increases then angle decreased.

So increases angle R decreased.

Hareesh said: (Jan 24, 2016)  
Phase angle tan-1(Xc/r).

Given 45 degrees.

Xc/R = tan-1 45.

So Xc = R.

Mohan said: (Jun 21, 2016)  
@Hareesh, What you said is right. But the question is to mention the condition for phase angle above 45 degrees so Xc>R.

Alok Kumar Gautam said: (Sep 20, 2016)  
It is not tan-1. It is tan inverse.

Pankaj said: (Mar 10, 2017)  
For pure capacitor angle = 90.
If R increases then angle decreased.

So increases angle R decreased.

So, I agree with the given answer.

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