JNTU B.Tech II ELECTROMAGNETIC THEORY AND TRANSMISSION LINES Previous Question Paper (April/May - 2023 - R13)

What are the Two Equations of Maxwell’s for electrostatic field?

What Electric Field Intensity and Current Density correspond to the drift velocity of 6.0 × 10⁻⁴ m/sec in a Silver Conductor?

State Biot-Savart’s Law.

Define magnetic flux density.

What is Brewster’s Angle?

Obtain the characteristic impedance of free space.

Draw the T – type equivalent circuit of a transmission line.

What is Propagation Constant?

State the applications of smith chart.

Sketch the input impedance of a lossless line for shorted and open circuited conditions.

State and explain Coulomb’s law.

The capacitance of the conductor formed by the two parallel metal sheets, each 100cm², in area separated by a dielectric 2mm thick is, 2×10⁻¹⁰ micro farad with a potential of 20KV is applied to it. Find (i) Electric flux (ii) Potential gradient in kV/m (iii) The relative permittivity of materials (iv) Electric flux density.

Derive Convection and Conduction Current with necessary equations.

Obtain the poisson’s and Laplace equations in electro static fields.

Describe how the inconsistency in Ampere’s Law is rectified by Maxwell.

An infinitely long conductor of radius 𝒂 is placed such that its axis is along the z-axis. The vector magnetic potential, due to a dielectric current 𝐼₀ flowing along 𝒂𝒛 in the conductor is given by

State and explain Faraday’s laws for time varying magnetic fields.

In free space

Derive the expression for the attenuation constant, phase constant and intrinsic impedance for a uniform plane wave in a good conductor.

If εr = 11, μ=μ₀ for the medium in which a wave with frequency f= 0.8GHz is propagating, determine propagation constant and intrinsic impedance of the medium when i) σ = 0 and ii) σ = 20 mho/m.

State and explain Poynting theorem.

A plane wave travelling in air is normally incident on a material with μr = 2 and εr = 6. Find the reflection and transmission coefficients.

Derive the relationship between secondary constant and primary constants of a transmission line.

A high frequency line has the following primary constants L=1.5 mH/Km, C=0.07μF/Km, R = G = negligible. Determine the characteristics impedance and propagation constant of the Line.

Derive the secondary constant equations from basic transmission lines.

A lossy cable which has R = 4.25 Ω/m, L = 3.0 μH/m, C = 2 pF/m, and G = 0 operates at f = 0.5 GHz. Find the attenuation constant of the line.

Define reflection coefficient of a transmission line and derive the expression for it.

A low loss transmission line of 100 Ω characteristic impedance is connected to a load of 400 Ω. Calculate the Reflection Coefficient and Standing wave ratio.

Discuss in detail about Double Stub Matching.

A 100Ω loss less line connects a signal of 100 KHz to load of 140 Ω. The load power is 100mW. Calculate (i) Voltage reflection coefficient (ii) VSWR (iii) Position of Vmax, Imax, Vmin and Imin.