Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (ECE)-Electronics And Communications Engineering 2020 December 3rd Sem 76446 Electromagnetic Waves Previous Question Paper
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (ECE) (2018 Batch) (Sem.?3)
ELECTROMAGNETIC WAVES
Subject Code : BTEC-303-18
M.Code : 76446
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1.
Compare magnetic scalar potential and magnetic vector potential.
2.
Define Reflection Coefficient.
3.
Mention the practical importance of smith chart.
4.
Define Gradient. What does it indicate?
5.
Define Phase Velocity.
6.
What is Intrinsic Impedance?
7.
For a symmetrical network, define propagation constant and characteristics impedance.
8.
Find out the skin depth in copper, whose conductivity is 5.8 ? 107S/m and relative
permeability is 1 at 10GHz.
9.
State electrostatic boundary conditions.
10. State the properties of uniform plane wave.
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SECTION-B
11. Deduce the wave equation for conducting medium.
12. Deduce the point form of Ampere's circuital law.
13. Derive Poynting vector and state its significance.
14. A distortionless transmission line has attenuation constant () of 1.15 ? 10?3Np/m and
capacitance of 0.1 ? 10?9 Farad per meter. The characteristic resistance = 50. Find the
resistance, inductance and conductance per meter of the line.
15. Describe Plane Wave Reflection.
SECTION-C
16. A rectangular air?filled copper waveguide with dimension 0.9 inch ? 0.4 inch cross section
and 12 inch length is operated at 9.2 GHz with a dominant mode. Find its cutoff frequency,
guide wavelength, phase velocity and characteristic impedance.
17. Clearly bring out the distinction between a standing wave and a propagating wave. What
difference does it mean, in terms of power flow given by pointing vector in both these
kinds of waves? Is standing wave finding an application anywhere? Why?
18. Discuss in detail surface currents on the waveguide walls.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 13 February 2021