Engineering BE Electronics and Telecommunication Sem 6 Summer 2022 2022 TE EXTC Electromagnetics And Antenna Question Paper - Mumbai University | munotes
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Questions asked in this paper
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Q1 Choose the correct option from the following questions. Each question carries equal marks
- 1) The ratio of maximum power density in the desired direction to the average power radiated from
- 2) If the length of the dipole decreases then the radiation resistance will — — C Depends on current distribution
- 3) If charges +Q and -Q are existing in some medium then the electric field intensity will terminate
- 4) Using Stoke’s theorem we integration into integration
- 5) the Laplace’s equation
- 6) Using boundary conditions, one can calculate component
- B. Only tangential D Sequential and Tangential
- 7) lf the distance between the transmitting and receiving antenna is decreased by factor 2 while factors remain same, then the new power received by the antenna A Increases by factor 2 B Decreases by factor 2 C Increases by factor 4 D Decreases by factor 4
- 8) Which of the following is true for circular polarization?
- 9) Gauss’s law for the electric field is given by
- 10) In yagi Uda, the length of the director compared to the driven element is C Independent to each other D Depends on the type driven element
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Q2 Solve any two. 2a)Define maximum usable frequency and skip distance. Derive maximum usable frequency in terms of skip distance and virtual height 2b) Write short note on parabolic reflector antenna. Describe feeding techniques of parabolic 2c) State and explain Coulomb’s law in electrostatics. A point charge Q1 = 2mC is located in free space at P1(-3,7,-4) while Q2 =5 nC is at P2(2,4,-1). Find force on Q2 by Q1 and vice versa 20 marks
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Q3 Solve any two 3a) Derive array factor of N-element linear array, where all elements are equally fed and spaced Also find the expression for the position of principle maxima, nulls and secondary maxima 3b) Discuss elctric field and magnetiv field boundary conditions at the interface of two mediums with relavant mathematical equations 3c) Describe the space wave propagation and derive relation for maximum distance between transmitting antenna. Earth is assumed to be flat
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Q4 Solve any two. 4a) Derive Maxwell’s equation in point form and integral form 4b) Design a rectangular microstrip patch antenna with dimensions W over a single substrate whose center frequency is 2.4 GHz. The dielectric constant of the substrate is 4.4 and the height of the substrate is 1.6 mm. Determine the physical dimensions W and L (in cm) of the patch, taking into 4c) Describe what is fading. What are the different types of fading. Explain each of them in details 20 marks
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