Engineering BE Electronics and Telecommunication Sem 4 May 2019 2019 Wave Theory And Propagation Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q2 Attempt any three out of the remaining five
2. Q3 Assume suitable data, wherever necessary and justify the same
3. Q4 Figures to the right indicate full marks
   • B) Given the potential V = 2x*y — 5z (V) and a point P (-4, find (2+2+1)
   • a) Electric field intensity at P
   • b) Electric flux density at P
   • c) Volume charge density at P
   • C) State the Maxwell’s equations for good dielectric in integral and point form. Also state their significance 5
   • D) With the help of neat schematic diagram, explain the working of an 5
   • E) Explain Super refraction. 5
4. Q2 A) Two extensive homogeneous isotropic dielectrics meet on plane z = 0 A uniform electric field E, = 5a, — 24, (kV/m) exists for z20
   • a) E, for z<0
   • b) The angles and make with the interface
   • B) State Poynting theorem. Derive its final expression and explain the meaning of
5. Q3 A) What is ionosphere? Describe its various layers. Which layers are present during day and night time? Where maximum attenuation of electromagnetic waves takes place inside the ionosphere? 10 marks
   • B) State and derive FRISS transmission equation. 10
6. Q4 A) Determine the potential at the free nodes in the potential system of Fig.1. using Paper Subject Code: WAVE THEORY AND PROPAGATION 10 marks
   • B) Derive Helmholtz equations for Magnetic field in free space. 5
   • C) For the normal incidence, determine the amplitudes of reflected and transmitted E and H at interface of two regions at z = 0 Second region is free space 5
7. Q5 A) Explain formation of duct and condition for duct propagation. 10 marks
   • B) Obtain an expression for MUF in terms of d, H and fe. (5+5) If a high frequency communication link is to be established between two points on the Earth 2000 km away, and the reflection region of ionosphere is at height of 200 km and has critical frequency of 5 MHz, then calculate the MUF for the
8. Q6 A) Explain the formation of inversion layer in troposphere. 5 marks
   • B) Define critical frequency as a measure of ionospheric propagation and (2+3) determine critical frequency for reflection at vertical incidence if the maximum value of electron density is 1.24 x per CC
   • C) Four like charges of 30 wC each are located at four corners of a square, the diagonal of which measures 8 m. Find the force on 150 wC charge located at the center of square 10

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