JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech II NETWORK ANALYSIS Previous Question Paper (April/May - 2023 - R16)

B. Tech | II | I | R16 | April/May - 2023

Answer PaperPaper Code: 133BJMaximum Marks: 75Time: 3 Hours

Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.

Part A

125 marks

What is an Ideal transformer?

2 marks

Answer

An ideal transformer is a theoretical device with no losses, possessing infinite permeability of the core, zero winding resistance, and perfect coupling between windings (coupling coefficient k = 1). It operates with no leakage flux and no hysteresis or eddy current losses.

Define self and mutual impedance.

3 marks

Answer

Self-impedance of a mesh is the total impedance of that mesh, calculated as the sum of all impedances present in that specific loop. Mutual impedance between two meshes is the impedance common to both meshes, representing the coupling effect where current in one mesh induces a voltage in the other.

State the condition of circuit at resonance.

2 marks

Answer

What is the significance of power factor?

3 marks

Answer

Define RMS and maximum value for a square wave.

2 marks

Answer

What are the Laplace transform of step and exponential functions?

3 marks

Answer

Define poles and zeros in a transfer function.

2 marks

Answer

What is a driving point in transfer function? Explain.

3 marks

Answer

Draw and explain T section network.

2 marks

Answer

State Foster’s Reactance theorem.

3 marks

Answer

Part B

210 marks

What is an electric circuit? What is a magnetic circuit? Make a comparison between electric circuit and magnetic circuit.

5 marks

Answer

Coil 1 of a pair of coupled coils has a continuous current of 5A, and the corresponding fluxes φ11 and φ12 are 0.2 and 0.4 mWb respectively. If the turns are N1 = 500 and N2 = 1500, find L1, L2, M and k.

5 marks

Answer

310 marks

Define and explain the following with an example: i) Oriented Graph ii) Tree of a Graph.

5 marks

Answer

An Iron ring of mean length 50 cms has an air gap of 1 mm and a winding of 200 turns. If the relative permeability of the Iron is 400, when a current of 1 Amp flows in the winding, determine the flux density, Neglect leakage and fringing.

5 marks

Answer

410 marks

An impedance Z1 = 10 + j10 Ω is connected in parallel with another impedance of resistance 8.5 Ω and a variable capacitance connected in series. Find C such that the circuit is in resonance at 5 KHz.

5 marks

Answer

Derive and draw the response of a series RLC circuit for step input.

5 marks

Answer

510 marks

An inductive coil of Resistance R and inductance L is connected in parallel with a capacitor C. Derive the expressions for resonant frequency and Q factor.

6 marks

Answer

Compare series and parallel resonance circuits in terms of bandwidth, impedances and quality factor.

4 marks

Answer

610 marks

For a series resonant circuit with constant voltage and variable frequency, obtain the frequency at which voltage across the inductor is maximum. Calculate this maximum voltage when R=50 ohms, L=0.05H, C=20 micro farad and V=100 volts use Laplace transforms.

5 marks

Answer

A pure inductance of 5 mH carries a current of the wave form shown in figure 1. Sketch the waveform of V(t) and P(t). Determine the average value of power.

5 marks

Answer

710 marks

Derive expression for R.M.S and average value of a sinusoidal alternating quantity.

5 marks

Answer

When an impulse voltage is impressed across R-C circuit, derive an expression for its current response using laplace transform.

5 marks

Answer

Determine the ‘h’ and ABCD parameters of the network shown in figure 2.

10 marks

Answer

910 marks

Explain clearly the following terms: i) Propagation constant ii) Characteristic impedance.

5 marks

Answer

Derive the relation between Z and Y parameters of two port network.

5 marks

Answer

1010 marks

Derive the equations for Attenuation, phase shift and characteristic impedance of Band pass filter.

5 marks

Answer

Design a constant ‘K’ T-section low pass filter having cutoff frequency of 2 kHz and nominal characteristic impedance of 600 ohms.

5 marks

Answer

1110 marks

What is an LC immittance function? State the properties of such functions.

5 marks

Answer

Design a T-type, alternator using resistors.

5 marks

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech II NETWORK ANALYSIS Previous Question Paper (April/May - 2023 - R16)

Part A

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Part B

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