# Practice Questions on Networks

 Q1. Three impedances each having a resistance of $20\;\Omega$ and an inductive reactance of $18 \;\Omega$ are connected in star across a 400 V, three phase supply. The line current is:
 A. 8.58 A B. 11.33 A C. 15.67 A D. 22.88 A

 Q2. In the circuit shown below, the current $I$ is equal to:
 A. $5\angle 0^\circ$ B. $7\angle 0^\circ$ C. $2\angle 0^\circ$ D. $12\angle 0^\circ$

 Q3. The value of current i is
 A. 12 A B. 22 A C. 32 A D. 45 A

 Q4. The transfer function of low-pass $RC$ network in the given figure is given as $H_{v}(\omega)=\dfrac{1}{1+j\left(\dfrac{\omega}{\omega_{x}}\right)} \text{; where, } \omega_{x}=\dfrac{1}{R_{1}C_{2}}$ The magnitude of the transfer function at a frequency of $1378$ Hz is:
 A. 0.5 B. 0.8 C. 1.2 D. 1.8

 Q5. The resonance frequency of a series RLC circuit is 1 kHz having a quality factor of $Q=30$. If R and C is doubled from its original value, the new $Q$ of the circuit is:
 A. $\dfrac{19}{\sqrt{3}}$ B. $\dfrac{15}{\sqrt{2}}$ C. $\dfrac{10}{\sqrt{3}}$ D. $\dfrac{9}{\sqrt{2}}$

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