Antenna and Wave Propagation 2018 Question Paper — Government College…
The 2018 Antenna and Wave Propagation previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.
- University: Government College of Engineering and Technology, Jammu
- Subject: Antenna and Wave Propagation
- Course: Antenna & Wave Propagation
- Branch: Electronics & Communication Engineering
- Year: 2018
- Paper: end-term
- Duration: 180 minutes
- Total marks: 100
Instructions
- Attempt five questions in all selecting at least two questions from each Section.
- Each question carries 20 marks.
Questions
Section -A
- QQ1(a). Explain the terms: i) Radiation Pattern ii) Radiation Density iii) Gain of Antenna iv) Beam area v) Effective Aperture (b) What is Effective aperture. Is directivity related to it. If so find the relation [20 marks]
- QQ2. Using reciprocity theorem prove that for antenna being used as transmitting or receiving element 1) Effective length remains the same 2) Radiation pattern remains the same [20 marks]
- QQ3. Derive the field strength at distant point due to short dipole [20 marks]
- QQ4(a). Explain principle of pattern multiplication. Can it be used for dissimilar sources. (b) Using principle of pattern multiplication, find the radiation pattern of two horizontally placed short dipoles, spaced $\lambda/2$ apart being fed with current of same magnitude but opposite phase [20 marks]
Section B
- QQ5(a). Explain the construction of rhombic antenna. What are its basic features. Why HF antennas need to be broadband (b) Give the construction of Yagi-uda antenna. What is the typical spacing between of the elements. Why does the size of director decreases with distance from driven element. [20 marks]
- QQ6(a). Derive the Friss Transmission formula for free space propagation (b) Discuss briefly the various kinds of wave propagation. [20 marks]
- QQ7(a). Explain the terms i) Critical frequency ii) Maximum Usable frequency iii) Skip Distance iv) Optimum Working Frequency v) Gyro Frequency (b) What is the effect of earth's magnetic field on ionospheric propagation [20 marks]
- QQ8. Write short notes on: 1) Space Wave propagation 2) Bending of radio waves by ionosphere [20 marks]