ELECTROMAGNETIC WAVES

The non existence of the magnetic monopole is due to which operation?

1. Gradient
2. Divergence
3. Curl
4. Laplacian

The charge density of a electrostatic field is given by

1. Curl of E
2. Divergence of E
3. Curl of D
4. Divergence of D

The Brewster angle is valid for which type of polarisation?

1. S polarised
2. P polarised
3. Elliptical
4. Linear

In conductors, which condition will be true?

1. σ/ωε > 1
2. σωε > 1
3. σ/ωε < 1
4. σωε < 1

Power density is basically termed as -------------- power per unit area.

1. Reflected
2. Refracted
3. Radiated
4. Diffracted

Most of the radar antennas use ------------.

1. Dipole
2. Collinear array
3. Broadside array
4. Horn and parabolic reflector

In an electrical circuit, which nature of impedance causes the current and voltages in phase?

1. Reactive
2. Resistive
3. Capacitive
4. Inductive

Magnetic field can be produced by ________________.

1. Conduction current
2. Displacement current
3. Both conduction and displacement current
4. None of the above

The ratio of radiation intensity in a given direction from antenna to the radiation intensity over all directions is called as___________.

1. Directivity
2. Radiation power density
3. Gain of antenna
4. Array Factor

The phenomenon employed in the waveguide operation is

1. Reflection
2. Refraction
3. Total internal reflection
4. Adsorption

Explain all the forms of Maxwell's equation in time varying conditions with its physical significance.

Consider the reflection phenomenon of plane wave through a medium having permittivity ε₁ and permeability μ₁ is incident normally to the surface of perfect dielectric medium with permittivity ε₂ and permeability μ₂. Derive the expression of reflection and transmission coefficients for electric and magnetic field.

A transmission line of characteristic impedance 50 Ω is terminated in a load impedance Z_L. The VSWR of the line is measured as 5 and the first of the voltage maxima in the line is observed at a distance of λ / 4 from the load. What is the value Z_L ?

30 m long lossless transmission line with Z₀ = 50 Ω operating at 2 MHz is terminated with a load Z_L = 60 + j40 Ω. If u = 0.6c on the line, find reflection coefficient, standing wave ration and input impedance.

Derive the radiation resistance of half-wave dipole antenna.

Derive transmission line differential equation. Also derive the condition of loss-less transmission from it.

for a given medium, μ = μ_o , ε = ε_o and σ = 5.8 x 10⁷ ℧ / m . A copper wire carries a conduction current of 2 Amp at 50 Hz then find out the displacement current in the wire?

Define Waveguide? What is mode? Explain different types of modes?

What is the Poynting vector? An isotropic antenna is radiating in free space at a distance of 50m from the antenna. The total magnetic field is measured to be 10mA/m. Find (i) power density and (ii) power radiated.

Derive the relation between E and H in uniform plane wave propagation. Derive intrinsic impedance and give its physical significance.

What do you understand the term power gain , directive gain and efficiency of antenna ? Find the relation among them.

Find the expression of radiated field from the half wave dipole? Also find the radiation resistance of the half wave dipole.

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

Derive the one dimensional general wave equation and find the solution for wave equation.

Hertz dipole antenna.

Transverse electromagnetic mode.

Faraday's Law of electromagnetic induction.

Gauss's Law.