Download GTU BE/B.Tech 2019 Winter 7th Sem Old 171001 Microwave Engineering Question Paper

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1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. Q.1 (a) Discuss the advantages of microwave frequencies compare with low-frequency waves and list out the various applications of microwaves. (07)
2. Q.2 (a) Draw and explain equivalent circuit of a length Ax of a transmission line at microwave frequencies. (07)
3. Q.3 (a) Describe the “Reflex Klystron” with the aid of suitable schematic diagram. Why the Transit Time is so important in this device. (07)

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4. Q.3 (b) Write the advantages and disadvantages of rectangular waveguide over circular wave guide .List out the differences between the TE mode and TM mode. (07)
   OR
   Q.4 (a) A transmission line has a characteristic impedance of 50 + j 0.01 Q and is terminated in a load impedance of 73 — j 42.5 Q. Calculate: (a) the reflection coefficient; (b) the standing-wave ratio. (07)
5. Q.4 (b) What do you mean by stub? Explain impedance matching by use of stub with necessary circuit, waveforms and derivation. (07)
6. Q.5 (a) With neat sketch, explain the operation of Magnetron. (07)
   

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   OR
   Q.5 (b) What 1s magic associated with a Magic Tee ?Draw a neat sketch of a Magic Tee and list out its applications and properties (07)
7. Q.1 (b) Explain construction, characteristic and-application of Gunn diode. (07)
8. Q.2 (b) Write a note on Directional coupler and its applications. Explain the terms Coupling factor and Directivity: (07)
9. Q.3 (a) What is Tunneling effect? Explain the construction and working of Tunnel diode. What are the applications of Tunnel diode? (07)
   

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   OR
   Q.3 (b) Explain the construction and working of IMPATT diode. What are its applications? (07)
10. Q.4 (a) With neat sketch, explain the operation of “Traveling Wave Tube”. (07)
11. Q.4 (b) What do you mean by Doppler effect? Explain operation of MTI radar. (07)
12. Q.5 (a) Explain Basic Principal of “RADAR” and Derive the basic RADAR Range Equations (07)
    

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    OR
    Q.5 (b) Describe Microstrip line in detail. (07)
13. Q.1 (a) Explain “Farday Rotation Circulator” and “Y Circulator” with neat sketch (07)

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