Download JNTUA B.Tech 1-1 R13 2019 Dec 13A04101 Network Analysis Question Paper

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Code: 13A04101

B.Tech I Year (R13) Supplementary Examinations December 2019
NETWORK ANALYSIS
(Common to ECE & EIE)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Write the tie-set matrix of the circuit shown in figure below.

(b) Draw the Thevenin equivalent resistance for the given network.

(c) A resistor in parallel with a capacitor absorbs 20 W when the combination is connected to a 240 V,
50 Hz source. If the power factor is 0.7 leading, what are the resistance and capacitance?
(d) If a coil draws 0.5A from a 120 V, 60 Hz source at 0.7 lagging power factor, what are the coil
resistance and inductance?
(e) Determine the quality factor of a RLC series circuit R = 10 ?, C = 100?F and L = 0.01mH.
(f) What values of inductor is to be used in a tank circuit to get a resonant frequency of 10 kHz and
bandwidth of 1 kHz? The winding resistance is 30 ?.
(g) Define the Z parameters.
(h) Define ideal filter.
(i) Give the relation between Decibel and Nepers.
(j) Design a constant- K low pass filter (T-section and ? section) having a cut-off frequency of 2 kHz to
operate with a terminated load resistance of 500 ?.

Contd. in page 2

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Code: 13A04101

B.Tech I Year (R13) Supplementary Examinations December 2019
NETWORK ANALYSIS
(Common to ECE & EIE)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Write the tie-set matrix of the circuit shown in figure below.

(b) Draw the Thevenin equivalent resistance for the given network.

(c) A resistor in parallel with a capacitor absorbs 20 W when the combination is connected to a 240 V,
50 Hz source. If the power factor is 0.7 leading, what are the resistance and capacitance?
(d) If a coil draws 0.5A from a 120 V, 60 Hz source at 0.7 lagging power factor, what are the coil
resistance and inductance?
(e) Determine the quality factor of a RLC series circuit R = 10 ?, C = 100?F and L = 0.01mH.
(f) What values of inductor is to be used in a tank circuit to get a resonant frequency of 10 kHz and
bandwidth of 1 kHz? The winding resistance is 30 ?.
(g) Define the Z parameters.
(h) Define ideal filter.
(i) Give the relation between Decibel and Nepers.
(j) Design a constant- K low pass filter (T-section and ? section) having a cut-off frequency of 2 kHz to
operate with a terminated load resistance of 500 ?.

Contd. in page 2

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Code: 13A04101

PART ? B
(Answer all five units, 5 X 10 = 50 Marks)

UNIT ? I

2 (a) Obtain the current I
x
by Thevenin?s theorem .

(b) Calculate the current through R
l
of the

network using superposition theorem.

OR
3 (a) A resistive network shown in figure, setup corresponding tie-set matrix and obtain KVL equation.

(b) A voltage source delivers 4A when the load connected is 5 ? and 2A when the load is 20 ?. What is
the maximum power it can deliver, power transfer efficiency when it delivers 50 W?

UNIT ? II

4 (a) Calculate the currents i
1
(t) and i
2
(t) of the circuit shown. Assume initially relaxed condition and the
switch is closed at t = 0.

(b) Three coils are connected in series. Derive the expression for the equivalent inductance.
OR
5 In the circuit shown, the initial value of the charge on the capacitor is 20 V. Calculate: (i) i(t) for t>0.
(ii) Time constant.

Contd. in page 3

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Code: 13A04101

B.Tech I Year (R13) Supplementary Examinations December 2019
NETWORK ANALYSIS
(Common to ECE & EIE)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Write the tie-set matrix of the circuit shown in figure below.

(b) Draw the Thevenin equivalent resistance for the given network.

(c) A resistor in parallel with a capacitor absorbs 20 W when the combination is connected to a 240 V,
50 Hz source. If the power factor is 0.7 leading, what are the resistance and capacitance?
(d) If a coil draws 0.5A from a 120 V, 60 Hz source at 0.7 lagging power factor, what are the coil
resistance and inductance?
(e) Determine the quality factor of a RLC series circuit R = 10 ?, C = 100?F and L = 0.01mH.
(f) What values of inductor is to be used in a tank circuit to get a resonant frequency of 10 kHz and
bandwidth of 1 kHz? The winding resistance is 30 ?.
(g) Define the Z parameters.
(h) Define ideal filter.
(i) Give the relation between Decibel and Nepers.
(j) Design a constant- K low pass filter (T-section and ? section) having a cut-off frequency of 2 kHz to
operate with a terminated load resistance of 500 ?.

Contd. in page 2

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R13
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Code: 13A04101

PART ? B
(Answer all five units, 5 X 10 = 50 Marks)

UNIT ? I

2 (a) Obtain the current I
x
by Thevenin?s theorem .

(b) Calculate the current through R
l
of the

network using superposition theorem.

OR
3 (a) A resistive network shown in figure, setup corresponding tie-set matrix and obtain KVL equation.

(b) A voltage source delivers 4A when the load connected is 5 ? and 2A when the load is 20 ?. What is
the maximum power it can deliver, power transfer efficiency when it delivers 50 W?

UNIT ? II

4 (a) Calculate the currents i
1
(t) and i
2
(t) of the circuit shown. Assume initially relaxed condition and the
switch is closed at t = 0.

(b) Three coils are connected in series. Derive the expression for the equivalent inductance.
OR
5 In the circuit shown, the initial value of the charge on the capacitor is 20 V. Calculate: (i) i(t) for t>0.
(ii) Time constant.

Contd. in page 3

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Code: 13A04101

UNIT ? III

6 (a) A coil of 10H and resistance of 10 ? is in with 100pF capacitor. The combination is connected across
a generator of 100 V, having internal resistance of 100 ?? ?. Determine: (i) Voltage across parallel
circuit at resonance. (ii) Bandwidth.
(b) Derive the expression for resonant frequency for a tank circuit.
OR
7 (a) In a series resonant circuit the resistance is 6 ?, the resonant frequency is 4.1 x 10
6
bandwidth is 10
5
rad/sec. Compute L and C of the network, half power frequencies and Q of the
circuit.
(b) Distinguish between reactance, impedance, admittance and suceptance.

UNIT ? IV

8 (a) For the bridged T network shown, find the driving point admittance y
11
21

with a 2 ? load resistor connected across port 2.

(b) For the hybrid equivalent circuit shown, determine the current gain and voltage gain.

OR
9 Find the z parameters for the circuit shown in figure below.

UNIT ? V

10 (a) Design a m-derived low pass filter having cut-off frequency of 2 kHz, design impedance of 500 ?
and the resonant frequency 2100 Hz.
(b) Design a constant-k high pass filter having a cut-off frequency of 1 kHz with a load resistance of
700 ?.
OR
11 Design a m-derived high pass filter with a cut-off frequency 5 kHz ,design impedance 500 ? and
m = 0.4
*****
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