Download PTU B-Tech ECE 2020 Dec 3rd Sem 76446 Electromagnetic Waves Question Paper

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Total No. of Pages : 02
Total No. of Questions : 18

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B.Tech. (ECE) (2018 Batch) (Sem.-3)
ELECTROMAGNETIC WAVES
Subject Code : BTEC-303-18
M.Code : 76446
Time : 3 Hrs. Max. Marks : 60

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

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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?

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5. Define Phase Velocity.
6. What is Intrinsic Impedance?
7. For asymmetrical network, define propagation constant and characteristics impedance.
8. Find out the skin depth in copper, whose conductivity is 5.8 x 10⁷S/m and relative permeability is 1 at 10GHz.
9. State electrostatic boundary conditions.

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10. State the properties of uniform plane wave.

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.

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14. A distortionless transmission line has attenuation constant (a) of 1.15 x 10^-3 Np/m and capacitance of 0.1 x 10^-9 Farad per meter. The characteristic resistance = 50O. 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 x 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?

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18. Discuss in detail surface currents on the waveguide walls.

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