Scribd
Upload
21 views2 pages

Maulana Abul Kalam Azad University of Technology, West Bengal

This document is an examination paper for the course EC501 Electromagnetic Waves at Maulana Abul Kalam Azad University of Technology, West Bengal. It consists of three groups of questions: Group-A with very short answer questions, Group-B with short answer questions, and Group-C with long answer questions, covering topics such as Maxwell's equations, transmission lines, waveguides, and antenna characteristics. The total marks for the exam are 70, and candidates are instructed to answer in their own words.

Uploaded by

examcell271
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
21 views2 pages

Maulana Abul Kalam Azad University of Technology, West Bengal

This document is an examination paper for the course EC501 Electromagnetic Waves at Maulana Abul Kalam Azad University of Technology, West Bengal. It consists of three groups of questions: Group-A with very short answer questions, Group-B with short answer questions, and Group-C with long answer questions, covering topics such as Maxwell's equations, transmission lines, waveguides, and antenna characteristics. The total marks for the exam are 70, and candidates are instructed to answer in their own words.

Uploaded by

examcell271
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 2

CS/B.

TECH(N)/ODD/SEM-5/5587/2023-2024/I136
MAULANA ABUL KALAM AZAD UNIVERSITY OF TECHNOLOGY, WEST BENGAL
Paper Code : EC501 Electromagnetic Waves
UPID : 005587

Time Allotted : 3 Hours Full Marks :70


The Figures in the margin indicate full marks.
Candidate are required to give their answers in their own words as far as practicable

Group-A (Very Short Answer Type Question)


1. Answer any ten of the following : [ 1 x 10 = 10 ]
(I) What is the unit of attenuation constant?
(II) An EM wave is propagating in a rectangular waveguide. What is the value of tangential component of E field at
the metal walls of the waveguide?
(III) How gain and directivity of an antenna is related?
(IV) If A is a vector quantity , AxA =?
(V) What is the relation between B and H?
(VI) Whether a distortionless line is also a lossless line?
(VII) Whether TEM mode of propagation is possible in a parallel plate waveguide?
(VIII) What is a Hertzian dipole antenna ?
(IX) If A ,B and C are vectors ,
Ax(BxC)= B(A.C)- ?
(X) In a uniform plane wave E/H=?
(XI) What is the relation between VSWR and Refection coefficient ?
(XII) A rectangular waveguide has width 'a' and height 'b' . If a>b , what is the wavelength of the longest wave which
can propagate through the waveguide?

Group-B (Short Answer Type Question)


Answer any three of the following : [ 5 x 3 = 15 ]
2. Write down Maxwell's equations in differential form. What is meant by displacement current? [5]
3. Draw the equivalent circuit of a transmission line and obtain equations for voltage and current. [5]
4. A parallel plate waveguide has w=2mm and d=0.5mm. Dielectric constant of the medium between the [5]
two plates is 2.4.
What is its characteristic impedance?
What value of w would make the characteristic impedance of the waveguide 50 ohm?
5. What is a dipole antenna ? [5]
What is the length of a half wave dipole antenna operating at 1GHz?
6. What is meant by polarisation? What are the characteristics of i)a linearly polarised wave and ii) a [5]
circularly polarised wave?

Group-C (Long Answer Type Question)


Answer any three of the following : [ 15 x 3 = 45 ]
7. (a) Obtain the expressions for Electric and Magnetic field of a plane electromagnetic wave propagating [ 10 ]
in a lossy dielectric medium.
(b) What are the significances of i) real and ii) imaginary parts of propagation constant? [5]
8. (a) Find input impedance , reflection coefficient and VSWR of a shorted transmission line. [8]
(b) How inductor and capacitor can be realised using shorted section of a transmission line? [7]
9. (a) Draw neatly front view ,top view and side view of E and H field lines for TE10 mode in a rectangular [ 10 ]
waveguide .
(b) Why TEM mode cannot propagate through a rectangular waveguide? [3]
(c) What is degenerate mode? [2]
10. (a) What are different types of losses that can occur in an antenna? What is meant by efficiency of an [6]
antenna?
1/2
(b) How directivity and gain of an antenna is related? How directivity and beamwidth of an antenna is [5]
related?
(c) Calculate the radiation efficiency of an antenna if the input power is 100W and the power [4]
dissipated in it is 1W.
11. (a) Obtain E field and H field intensities at a distance 'r' from a Hertzian dipole. [ 12 ]
(b) How different field regions are separated depending on the value of 'r'? [3]

*** END OF PAPER ***

2/2

You might also like