UNIT V
BIG QUESTIONS:
1. ( i ) Derive the general wave equation.
( ii )Discuss about the plane waves in lossy dielectrics.
2.
Briefly explain about the wave incident
( i ) normally on a perfect conductor
( ii )obliquely to the surface of perfect conductor.
(April/May 2008)
(May/June 2007)
(April/May 2008)
3.
Derive the wave equations in phasor form and also derive for α,β,γand η. (Nov/Dec2007)
4.
Explain in detail the wave incident normally on perfect dielectric. (May/June 2007)
5.
(i)Explain about the propagation of EM waves in good conductor.
(ii) A uniform plane wave is travelling at a velocity of 2.5 x 10
5 m/s having wavelength
λ = 0.25mm in a good conductor. Calculate the frequency of wave and the conductivity of the medium.
2007)
6.
Derive the wave equations for plane waves in
(Nov/Dec
( i) free space ( ii) homogeneous materials (iii)conducting medium. (April/May 2008)
7.
(i) Describe about linear and circular polarization.
(ii) Describe about reflection of plane waves by a perfect dielectric. (May/June 2007)
8.
(i) Calculate the attenuation constant and phase constant for a uniform plane wave with frequency of 10 GHz in a medium for which μ = μ
0
, ε r
=2.3 and σ =2.56 x 10
-4 mho/m
(ii) Derive the expressions for the attenuation constant, phase constant and intrinsic impedance for a uniform plane in a good conductor. (May/June 2006)
9.
(i) Assume that E and H waves, travelling in free space, are normally incident on the interface with a perfect dielectric with ε r
=3. Calculate the magnitudes of incident, reflected and transmitted E and H waves at the interface.
(ii) A uniform plane wave of 200MHz, travelling in a free space impings normally on a large block of material having ε r
= 4, μ r
= 9, σ = 0. Calculate transmission and reflection coefficients at the interface. (May/June 2006)
10.
Derive the expression for total field when a horizontally polarized EM wave is incident obliquely on a perfect conductor.

11.
Derive the expression for total field when a vertically polarized EM wave is incident obliquely on a perfect conductor.
12.
Determine the reflection coefficient of oblique incidence in perfect dielectric for perpendicular polarization.
13.
Determine the reflection coefficient of oblique incidence in perfect dielectric for parallel polarization.
14.
A lossy dielectric is characterized by ε r
= 2.5, μ r
= 4 and σ = 10 -3 mho/m at 10MHz. Let
E =10e -Vz a x
V/m. Find (i) α (ii) β (iii) λ (iv) V p
(v) η ?
15.
Given two dielectric media, medium 1 is free space and medium 2 has ε
2
= 4 ε
0
and μ
2
=
μ
0
. Determine reflection coefficient for oblique incidence θ
1
=30
ο
for a) perpendicular polarization and b) parallel polarization.
16.
For a lossy dielectric material having ε r
= 48, μ r
= 1, σ = 20 s/m. Calculate the propagation constant at a frequency of 16 GHz.
17.
Find the depth of penetration of plane wave in copper at a power frequency of 60Hz and at microwave frequency 10
10
Hz. Given σ = 5.8 x 10
7
mho/m
18.
(i)Derive the wave equation starting from maxwell equation for free space
(ii)Explain reflection of uniform plane waves with normal nicidence at a plane dielectric boundary. (May/June
2009)
19.
Explain the types of polarization of uniform plane wave.
(May/June 2009)
20.
(i)Derive wave equation for E and H in conducting medium
(ii)Write briefly on total internal reflection (Nov/Dec 2009)