JNTU
JNTU B.Tech II ELECTROMAGNETIC THEORY AND TRANSMISSION LINES Previous Question Paper (February - 2024 - R15)
Question paper consists of Part A, Part B. Part A is compulsory, which carries 25 marks. In Part A, answer all questions. 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
Define the various types of distortions in transmission lines.
Answer
The primary types of distortion in transmission lines are frequency distortion, which occurs when different frequency components of a signal travel at different phase velocities, and delay (or phase) distortion, which occurs when the phase shift is not a linear function of frequency, causing different components to arrive at different times.
Derive relation between VSWR and reflection coefficient.
Answer
The Voltage Standing Wave Ratio (VSWR) is defined as the ratio of maximum voltage to minimum voltage on the line:
where Γ is the reflection coefficient. Solving for Γ, we get:
Define reflection loss and insertion loss.
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Define skin effect.
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Define lossless and conducting mediums.
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State Biot - Savart's law.
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Give the equation of force on between two current elements.
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Obtain the expression for parallel plate capacitor.
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State Maxwell's equations in integral form.
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What is loading of transmission lines?
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Part B
Evaluate the electric field intensity at a point P (-5, 7,-4) in free space due to a charge of 0.2 milli coulombs placed at point R(2,-1,-2).
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Derive the expression for point form of Gauss law.
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Define Electric field intensity at a point. Derive the expression for E for a line charge.
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An infinitely long uniform line charge is located at y=3, z=5 of PL= 30 nc/m. Find E at the origin.
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State and explain Faraday’s law of induction & magnetic flux.
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A current element 4 cm long is along y-axis with a current of 10 mA flowing in y-direction. Determine the force on the current element due to the magnetic field if the magnetic field H = 5/µ ax A/m.
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Starting with Ampere's law, derive Maxwell's equation in integral form based on this law and obtain the corresponding differential equation by applying Stoke's theorem.
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Given E=10sin(wt-βz) ay V/m in the free space, determine D,B,H.
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Derive the relationship between E and H field and show that E/H = 120π.
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Write briefly about instantaneous, average and complex Poynting vectors.
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Differentiate the wave propagation in good conductors and good dielectrics.
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Write a short note on power loss in a plane conductor.
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Derive an expression for input impedance at any point in a transmission line.
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Derive the secondary constants for a low loss transmission line.
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Derive the condition for distortion less transmission line.
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Define phase and group velocities and derive relation between them.
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Explain the design procedure of single stub matching.
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A 50 ohm line is terminated with a load ZL = 75 + j 65 ohms. Determine the input impedance of quarter wave transformer to this transmission line and load.
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Explain the characteristics and applications of Smith chart.
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Sketch input impedance versus line length for short and open circuited lines with 0 < l < λ.
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