Question 104: AC fundamentals

Question

For a series LCR circuit, I vs $\omega$ curve is shown :
(a) To the left of $\omega$
r
, the circuit is mainly capacitive.
(b) To the left of $\omega$
r
, the circuit is mainly inductive.
(c) At $\omega$
r
, impedance of the circuit is equal to the resistance of the circuit.
(d) At $\omega$
r
, impedance of the circuit is 0.
Choose the most appropriate answer from the options given below :
![](https://app-content.cdn.examgoal.net/fly/@width/image/1l55xsxik/cad58984-dd5d-4d5a-93ef-e33e3e8e385f/cfe875d0-fb26-11ec-a177-3bb3bda6ce3e/file-1l55xsxil.png?format=png)

Accepted Answer

We know that ${X_C} = {1 \over {\omega C}}$ and ${X_L} = \omega L$
Also, at $\omega  = {\omega _r}:{X_L} = {X_C}$
$\Rightarrow$ For $\omega  < {\omega _r}$ : capacitive
and $\omega  = {\omega _r}:z = \sqrt {{R^2} + {{({X_L} - {X_C})}^2}}  = R$

Answer

(a) and (d) only.

Answer

(b) and (d) only.

Answer

(a) and (c) only.

Answer

(b) and (c) only.

AC fundamentals

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