Hall Ticket No Question Paper Code: AEC007
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech IV Semester End Examinations (Regular) May, 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. Deduce the equation for force due to the n number of charges.
A charge of 1 Coloumb is what charge must be placed which will make y
component of total is equal to zero at the point(1,2,2).
2. Discuss in detail about four different types of charge distribution.
A uniform line charge in 2.5c/m2 lies along the Z-axis and a concentric circular cylinder of
radius 3m has a surface charge of -0.12c/m2. Both the distributions are infinite in extent with
respect to Z-axis using Gauss's law find D in all regions, the region is free space.
UNIT II
3. Prove that the line integral of about any closed path is equal to the current enclosed by the
path.
A Solenoid of 10cm diameter and 30cm length in wound with 150 turns and carries a current of
5A. Find the magnetic flux density at a point on the axis at a distance of 10cm from the midpoint
of the solenoid.
4. Represent the four Maxwell's equation in integral form .
An electric field enters from air into a dielectric slab at an oriented of 1. Show that the electric
field leaves the dielectric slab at the same orientation of to define boundary conditions.
UNIT III
5. Establish the relation between E and H for a travelling uniform plane wave.
Determine:
i. Attenuation Constant
ii. Phase Constant
iii. Propagation Constant
iv. Wavelength
v. Phase Velocity
vi. Intrinsic impedance for damp soil at frequency of 1MHz.
given that and conductivity 20X103siemens/m:
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6. Define polarization. Explain the types of polarizations in detail.
A 10 GHZ uniform plane wave travelling in free space in x-direction has Ex=1 v/m. Find the
value of magnetic field and the propagation constant when =0.
UNIT IV
7. State the various types of transmission lines used in practice.
A generator of IV 1 KHz supplies power to a 100 km open wire line transmitted in 200
resistance.
The line parameters are R=10
L=3.8mH/km, G=1X106mho/km, C=0.0085F/km,
calculate the input impedance, reflection, co-efficient, the input power, the output power and
transmission efficiency.
8. For a cable it is decided to provide lumped loading, the primary constant of cable are R=40

mho/km, C=0.05F/km. Find the new value of inductance required
to achieve the distortion less condition, By what factor the inductance required to be revised.

Derive voltage and current equations for a transmission line.
UNIT V
9. What is the need for stub matching in transmission line? Discuss briefly the different types of
stub matching?
What are standing waves? Determine the VSWR for a 50
line which is terminated with load
90+j60
.
10. Derive the equations for quarter and half-wave lines as circuit elements.
If VSWR of a line is 1.5 then calculate its reflection co-efficient.