B.TECH - Semester 3 network analsis and synthesis Question Paper 2020 (feb)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Test whether the polynomial $P(S)=S^{5}+3 S^{3}+2 S$ is Hurwitz. ( $\mathbf{1 0} \boldsymbol{\times} \mathbf{4} \boldsymbol{=} \mathbf{4 0}$ Marks) PART - B Module - I
- State and explain Millman's theorem.
- With an example explain Norton's theorem.
- Obtain an expression for series resonant frequency.
- A balanced star connected load having an impedance $(15+j 20) \Omega$ per phase is connected to a $3-\phi, 440 \mathrm{~V}, 50 \mathrm{~Hz}$ supply. Find the line currents and the power absorbed by the load.
- For the circuit shown in Figure, find the current equation when the switch is changed from position 1 to position 2 at $t=0$.
- For the network shown in figure, obtain the driving point impedance.
- Explain ABCD parameters of a two port network.
- Differentiate between low pass, high pass and band pass filters.
- Outline the design procedure of K-type low pass filters.
- (a) Use nodal analysis to find the power dissipated in the $6 \Omega$ resistor for the circuit shown in figure. 10
- (b) Determine the Thevenin's equivalent circuit across terminals $A B$ for the circuit shown in figure. 10 OR 2 H - 4534
- (a) For the circuit shown in figure, determine the value of $V_{2}$ such that the current through $(3+j 4) \Omega$ impedance is zero.
- (b) A delta connected $3-\phi$ load has $10 \Omega$ between R and $\mathrm{Y}, 6.36 \mathrm{mH}$ between Y and B , and $636 \mu \mathrm{~F}$ between B and R . The supply voltage is 400 V , 50 Hz . Calculate the line currents for RBY phase sequence. 7
- (c) Find the voltage across the $10 \Omega$ resistor for the network shown in figure. 7
- (a) A voltage $v(t)=10 \sin w t$ is applied to a series RLC circuit. At the resonant frequency of the circuit, the voltage across capacitor is found to be 500 V . The band width is $400 \mathrm{rad} / \mathrm{sec}$, and the impedance at resonance is ...
- (b) A series RLC circuit consists of $R=20 \Omega, L=0.05 \mathrm{H}, C=20 \mu \mathrm{~F}$ with a 100 V dc source and a switch. Find the transient current when the switch is closed at $t=0$.
- (c) Find the $Z$-parameters for the circuit shown in figure. OR
- (a) The impedance parameters of a two port network are $Z_{11}=6 \Omega$, $Z_{22}=4 \Omega, Z_{21}=3 \Omega$. Compute the $Y$-parameters.
- (b) The hybrid parameters of a two port network shown in figure are $h_{11}=1 \mathrm{k} \Omega$, $h_{12}=0.003, h_{22}=50 \mu v, h_{21}=100$. Find $v_{2}$ and Z-parameters of the network.
- (c) Express the transmission parameters of a given two port network in terms of the hybrid parameters.
- (a) Explain the necessary conditions for a driving point function.
- (b) A $\pi$-section filter network consists of a series inductance of 10 mH and two shunt capacitances of $0.16 \mu \mathrm{~F}$ each. Calculate the cut-off frequency and attenuation and phase shift at 12 KHz .
- (c) Design an $m$-derived $T$-section filter (high pass) with a cut-off frequency 10 KHz design impedance of $200 \Omega$ and $\mathrm{m}=0.4$.
- (a) Find the first foster form of the driving point function of $Z(S)=\frac{2(S+2)(S+5)}{(S+4)(S+6)}$.
- (b) Find the second foster form of RL network for the function $Y(S)=\frac{S^{2}+8 S+15}{S^{2}+5 S+4}$.
- (c) Find the first cauer form of the given function $Z(S)=\frac{(S+1)(S+3)}{S(S+2)}$.