Hall Ticket No Question Paper Code: AEC007
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech IV Semester End Examinations (Supplementary) July, 2018
Regulation: IARE R16
ELECTROMAGNETIC THEORY AND TRANSMISSION LINES
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. State and explain Gauss's law and Write corresponding maxwell's equation.
Define Electric field intensity? Two point charges 1 mC and mC are located at and
respectively. Calculate the electric force on a 10nC charge located at and the
electric field intensity at that point?
2. Derive Poisson's and Laplace's equations.
A wire of diameter 1 mm and conductivity 5×107S/m has 1029 free electrons per cubic meter.
When an electric field of 10mV/m is applied. Determine
The charge density of free electrons
The current density
The current in the wire
The drift velocity of the electron
UNIT II
3. State and explain Biot-Savart's law to determine line current, surface current and volume current.

An infinitely long wire of radius is placed along the z-axis and carries current along By
applying ampere's circuit law, Find H at Sketch as function of .
4. Determine the capacitance of a coaxial cable of inner radius and outer radius
State and explain Faraday's laws of electromagnetic induction in both integral and differential
forms.
UNIT III
5. Derive the expression for attenuation constant and phase constant in a lossy dielectric medium.

In a lossless dielectric for which 1 and H ax+0:5sin ayA/m;
Calculate and
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6. Discuss about reflection and refraction of plane waves for normal incidence at the interface between
two dielectrics.
State and prove Poynting theorem. Explain its significance.
UNIT IV
7. Prove that the velocity of propagation is same in distortion less line and loss less transmission
line?
An air-line has a characteristic impedance of 70
and a phase constant of 3 rad/m at 100 MHz.
Calculate the inductance per meter and the capacitance per meter of the line.
8. List out different types of transmission lines and write their applications.
Find the characteristic impedance, propagation constant and velocity of propagation for a transmission
line having the following parameters: R=84
H=0.01H/km, C=0.061
frequency 1000 Hz.
UNIT V
9. By using smith chart, Find the input impedance of 75 Ohms losses transmission line of length
0.1 When the load is short.
Derive the relation between VSWR and reflection coefficient and write the formulae for reflection
coefficient in terms of input impedance.
10. Define input impedance of a transmission line and derive the expression for it.
Discuss about single and double stub matching with the help of neat sketches.