Download AKTU B-Tech 3rd Sem 2016-2017 NCE 301 Fluid Mechanics Question Paper

VASAVI COLLEGE OF ENGINEERING (Autonomous), HYDERABAD

B.E. (ECE) VI Semester Main Examinations, May-2019

Microwave Engineering (Open Elective-II)

Time: 3 hours                                                                                                                          Max. Marks: 70

Note: Answer ALL questions in Part-A and any FIVE from Part-B

Part-A (10 x 2 = 20 Marks)

1. Define microwave frequency band.

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2. Write any two applications of microwaves.
3. Define S-matrix.
4. What are the properties of E-plane Tee?
5. What are the advantages of microwave resonators?
6. Define unloaded Q.

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7. Write the applications of PIN diode.
8. Define velocity modulation.
9. What are the limitations of conventional tubes at microwave frequencies?
10. What are the advantages of microwave solid state devices?

Part-B (5 x 10 = 50 Marks)

11. 1. Explain the propagation of microwaves through rectangular waveguide.

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    2. A rectangular waveguide with dimensions a = 2.5 cm and b = 1 cm is to operate at TE₁₁ mode. Calculate the cut-off frequency and the wave impedance at a frequency of 12 GHz.
12. 1. Derive the S-matrix for magic Tee.
    2. Explain about waveguide attenuator.

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13. 1. Explain about re-entrant cavities.
    2. Derive the expression for resonant frequency of rectangular cavity resonator.
14. 1. Explain the principle of operation of Tunnel diode with energy band diagram.
    2. Write short notes on Schottky diode.

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15. Explain the working principle of two cavity Klystron amplifier and derive the equation for beam coupling coefficient.
16. Explain the working principle of travelling wave tube (TWT) and derive the gain equation.
17. Write short notes on any two of the following:
    1. Gunn diode
    2. Parametric amplifier

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    3. Microwave transistors

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