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EndsemNov 20222019 patternBE E&TC

Radiation & Microwave Theory (RMT) SPPU Endsem Question Paper Nov 2022

All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated RMT questions
Subject code
404181
Pattern
2019 pattern
Exam
Endsem
Session
Nov 2022
Max. marks
70
Time
2½ Hours
Semester
VII
Paper code
[5927]-378

Printed for: B. E. (Electronics and Telecommunication Engg.)

Instructions to the candidates

  1. Answer Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8.
  2. Draw neat diagrams wherever necessary.
  3. Figures to the right indicate full marks.

Questions

  1. Q1

    1. a)

      With the help of suitable diagram explain the how Magic Tee is used for measurement of unknown impedance.

      Also asked:Nov 2023

      [6]
    2. b)

      A symmetric directional coupler with infinite directivity and a forward attenuation of 20Db is used to monitor the power delivered to a load Z L in below Figure. Bolometer 1 introduces a VSWR of 2.0 on arm 4; bolometer 2 is matched to arm 3. If bolometer 1 reads 8mW and bolometer 2 reads 2 mW, find: i) the amount of power dissipated in the load Z L ; ii) the VSWR on arm 2.

      [6]
    3. c)

      With the help of constructional details explain the operating principle of Isolator. 2

      [5]

  2. Q2

    1. a)

      Explain the roll of Microwave Attenuator. Explain the Card/Fixed type of attenuator.

      Also asked:May 2025

      [5]
    2. b)

      Enlist the characteristics of Scattering Matrix. Derive the scattering matrix for H-Plane Tee.

      Also asked:May 2025

      [6]
    3. c)

      With the help of suitable diagram explain the operation of Two-hole directional coupler.

      Also asked:Nov 2025 ·May 2025 ·May 2024 ·Nov 2023 ·May 2023

      [6]

  3. Q3

    1. a)

      What is the slow wave structure? Explain how a helical TWT achieves amplification.

      Also asked:May 2025

      [6]
    2. b)

      With the help of Constructional Details explain the operating principle of Reflex Klystron.

      Also asked:May 2025 ·Nov 2024

      [6]
    3. c)

      How bunching is achieved in cavity Magnetron. Explain the phase focusing effect.

      Also asked:May 2024 ·Nov 2023 ·May 2023

      [5]

  4. Q4

    1. a)

      Distinguish between the Klystron tube and Travelling wave tube amplifier.

      Also asked:May 2025

      [6]
    2. b)

      A 2-cavity Klystron amplifier has the following characteristics: Voltage. gain = 15 dB Input power = 5 mV Rsh of input cavity = 30 K Ω Rsh of output cavity = 40 K Ω RL (load impedance) = 40 K Ω Determine: i) The input r.m.s. voltage ii) The output r.m.s. voltage iii) The power delivered to the load.

      [6]
    3. c)

      What are the limitations of conventional tubes at microwave Frequencies.

      Also asked:May 2024 ·Nov 2023 ·May 2023

      [5]

  5. Q5

    1. a)

      Explain the constructional detail and operation of Microwave transistor.

      [6]
    2. b)

      Define negative differential resistivity. Explain the V-I characteristics of Gunn diode using two valley theorem.

      [6]
    3. c)

      What is a PIN diode? Describe the construction of a PIN diode and also its characteristics. 3

      Also asked:Nov 2025 ·Nov 2024 ·May 2024 ·Nov 2023 ·May 2023

      [6]

  6. Q6

    1. a)

      Explain the operation of Varactor diode. Discuss the constructional details, equivalent circuit and figure of merit. Mention its applications.

      [6]
    2. b)

      An IMPATT diode has a drift length of 2 μ m. Determine i) the drift time of the carrier ii) the operating frequency of the diode.

      [6]
    3. c)

      What are the avalanche transit time devices? Explain the working principle of TRAPATT diode.

      [6]

  7. Q7

    1. a)

      Calculate the SWR of a transmission system operating at 10 GHz. Assume TE10 wave transmission inside a waveguide of dimensions a = 4 cm, b = 2.5 cm. The distance measured between twice minimum power points = 1 mm on a slotted line.

      [6]
    2. b)

      Using suitable block diagram explain the operating principle of RADAR. Enlist the applications of RADAR.

      Also asked:May 2025

      [6]
    3. c)

      What is Terrestrial microwave Communication System. Enlist its advantages and Limitations.

      [6]

  8. Q8

    1. a)

      Write a note on : Medical Application such as Microwave Diathermy.

      Also asked:May 2025

      [6]
    2. b)

      What are the hazards of Electromagnetic Radiations? Explain the different types of Radiation Hazards.

      [6]
    3. c)

      A 10GHz RADAR has the following characteristics, peak transmitted power = 250kW; power gain of antenna = 2500; minimum detachable peak signal power by receiver = 10 –14 watts; cross sectional area of the RADAR = 10m 2 . If this RADAR were to be used to detect a target of 2m 2 equivalent cross section, find the maximum range possible. 

      [6]