JNTU
JNTU B.Tech II NETWORK ANALYSIS AND TRANSMISSION LINES Previous Question Paper (April/May - 2023 - R18)
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
What is mutual inductance?
Answer
Mutual inductance is the property of two or more inductive coils where a change in current in one coil induces an electromotive force (EMF) in the other coil due to the linkage of magnetic flux. It is denoted by M and is measured in Henries (H).
This phenomenon occurs when the magnetic field produced by the current in the first coil passes through the turns of the second coil.
Write the volt-ampere relations of R, L, C parameters.
Answer
The volt-ampere relations for the three fundamental passive circuit elements are as follows:
For a Resistor (R), the relationship is defined by Ohm's Law:
For an Inductor (L), the voltage is proportional to the rate of change of current:
For a Capacitor (C), the current is proportional to the rate of change of voltage, expressed as:
Alternatively, the voltage across a capacitor can be expressed in terms of the integral of the current:
What is over damped and under damped circuit?
Answer
Sign in to view the complete answer paper.
Explain how does RC circuit acts as a differentiate?
Answer
Sign in to view the complete answer paper.
Define Two-port network.
Answer
Sign in to view the complete answer paper.
What is the condition for Symmetry and Reciprocity in Z and Y parameters?
Answer
Sign in to view the complete answer paper.
Define phase distortion.
Answer
Sign in to view the complete answer paper.
State the properties of infinite line.
Answer
Sign in to view the complete answer paper.
Define standing wave ratio.
Answer
Sign in to view the complete answer paper.
Explain the use of quarter wave line for impedance matching.
Answer
Sign in to view the complete answer paper.
Part B
Draw the oriented graph of a network with fundamental cut-set matrix as shown in table. Also find number of cut-sets and draw them.
| Twigs | Links |
|---|---|
| 1 2 3 4 | 5 6 7 |
| 1 0 0 0 | -1 0 0 |
| 0 1 0 0 | 1 0 1 |
| 0 0 1 0 | 0 1 1 |
| 0 0 0 1 | 0 1 0 |
Answer
Sign in to view the complete answer paper.
Define coefficient of coupling. Derive its expression for two magnetically coupled coils.
Answer
Sign in to view the complete answer paper.
Explain the dot convention used in magnetic circuits.
Answer
Sign in to view the complete answer paper.
A series RLC circuit consists of a resistance of 25Ω, inductance 0.4 H, capacitance of 250 μF is connected a supply of 230V, 50 Hz. Find the total impedance, current, power, power factor, voltage across coil and capacitance.
Answer
Sign in to view the complete answer paper.
Derive the expression for transient response of R-L series circuit for ac excitation.
Answer
Sign in to view the complete answer paper.
Derive the expression for transient response of R-C circuit excited by a) step input and square input.
Answer
Sign in to view the complete answer paper.
For the two-port network shown in figure 1, find the short-circuit admittance parameter matrix?
Answer
Sign in to view the complete answer paper.
Find out h parameters of the circuit shown in the figure 2?
Answer
Sign in to view the complete answer paper.
Find the transmission parameters for the circuit shown in figure 3.
Answer
Sign in to view the complete answer paper.
Explain about h-parameters in terms of y-parameters.
Answer
Sign in to view the complete answer paper.
Derive an expression for input impedance of lossless line.
Answer
Sign in to view the complete answer paper.
Explain in detail about propagation constant of transmission wave.
Answer
Sign in to view the complete answer paper.
Derive an expression for attenuation constant, phase constant and velocity of signal transmission (v) for the uniformly loaded cable.
Answer
Sign in to view the complete answer paper.
Explain about waveform distortion and distortion less line condition.
Answer
Sign in to view the complete answer paper.
Describe the applications and properties of smith chart.
Answer
Sign in to view the complete answer paper.
A 30 m long lossless transmission line with characteristic impedance (zo) of 50 ohm is terminated by a load impedance (ZL) = (60 + j40) ohm. The operating wavelength is 90m. Find the input impedance and SWR using smith chart.
Answer
Sign in to view the complete answer paper.
Explain about λ/ 2 wave line.
Answer
Sign in to view the complete answer paper.
Explain single stub matching on a transmission line and derive the expression and the length of the stub used for matching on a line.
Answer
Sign in to view the complete answer paper.