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

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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 $

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Q3.

The value of current i is

A.

12 A

B.

22 A

C.

32 A

D.

45 A

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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

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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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