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EndsemMay 20252019 patternBE E&TC

Radiation & Microwave Theory (RMT) SPPU Endsem Question Paper May 2025

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
May 2025
Max. marks
70
Time
2½ Hours
Semester
VII
Paper code
[6404]-124

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

Instructions to the candidates

  1. Solve Q1 or Q2, Q3 or Q4, Q5 or Q6, Q7 or Q8.
  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 as a Mixer.

      [5]
    2. b)

      What are the different performance parameters of directional coupler. Explain the operation of two hole directional coupler.

      Also asked:Nov 2025 ·May 2024 ·Nov 2023 ·May 2023 ·Nov 2022

      [6]
    3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [6]

  2. Q2

    1. a)

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

      Also asked:Nov 2022

      [5]
    2. b)

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

      Also asked:Nov 2022

      [6]
    3. c)

      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 arm4; 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. 2

      [6]

  3. Q3

    1. a)

      Distinguish between the Klystron tube and Travelling wave tube amplifier.

      Also asked:Nov 2022

      [6]
    2. b)

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

      Also asked:Nov 2024 ·Nov 2022

      [6]
    3. c)

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

      Also asked:Nov 2022

      [5]

  4. Q4

    1. a)

      Explain the working principle of two cavity Klystron Amplifier.

      [6]
    2. b)

      A reflex klystron operates at the peak mode of n=2 with V 0 280V, I 0 = 22mA and signal voltage V 1 = 30V, Determine (i) the input power, (ii) the output power, and (iii) the efficiency.

      [6]
    3. c)

      Explain the HF limitations of Conventional tube.

      [5]

  5. Q5

    1. a)

      What is parametric Amplifier? How it is different from a normal amplifier.

      [6]
    2. b)

      Describe the several domain formation modes of a Gunn diode.

      [6]
    3. c)

      With the help of circuit diagram explain the Schottky Barrier Diode.

      [6]

  6. Q6

    1. a)

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

      [6]
    2. b)

      With the help of Energy band diagram explain how Tunnel diode exhibits negative resistance in the part of its forward characteristics.

      [6]
    3. c)

      Discuss the application of PIN diode as a switch.

      Also asked:Nov 2025 ·Nov 2024

      [6]

  7. Q7

    1. a)

      A slotted line is used to measure the frequency and it was found that the distance between the nulls is 1.85 cm. Given guide dimensions are (3×1.5) cm. Calculate the value of frequency 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:Nov 2022

      [6]
    3. c)

      With the help of suitable block diagram explain the measurement of VSWR using double minima method.

      [6]

  8. Q8

    1. a)

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

      Also asked:Nov 2022

      [6]
    2. b)

      Write a note on radiation hazard levels for personnel.

      Also asked:Nov 2023

      [6]
    3. c)

      A marine radar operating at 10GHz has a maximum range of 50kM with an antenna gain of 4000. If the transmitter has a power of 250 kW and minimum detectable signal of 10 –11 W. Determine the cross section of the target the radar can sight. 

      [6]