Microwave Engg Oral Exam Questions Bank

Updated on 2017/10/10 16:42

Microwave Engg Oral Exam Questions Bank

Part I: Questions based on Microwave Lab Experiments

1) Enlist different microwave components?

2) Draw a block diagram of

  • Reflex klystron based microwave test bench.
  • Gunn oscillator based microwave test bench.
3) Explain working of Reflex klystron with help of block diagram & circuit’s diagram?
4) Difference between single-cavity, multi –cavity klystron?

5) Features & Application of

  • Multi cavity klystron
  • Reflex klystron
6) Define different waveguide parameter & write formula for each?
7) Difference between transmission line & waveguide ?
8) Explain the working of Gunn Diode & PIN Diode state features & application of both?
9) Explain the use of PIN Diode as a modulator?
10) State different microwave solid state devices?
11) Which device can be used as microwave source?
12) State names of different frequency bands present in electromagnetic spectrum?
13) In case of Gunn Diode VI characteristics define negative resistance & positive resistance region of operation & also define about valley point, peak current, peak voltage etc?

14) Explain the operation of following TEE’s

  • E plane
  • H plane
  • E-H plane (Magic Tee)
15) What is scattering Matrix? State different properties OS S-matrix?

16) Write down the S matrix of

  • E plane tee
  • H plane tee
  • Circulator
  • Isolator
  • E-H plane tee (Magic tee)
  • Directional coupler
17) Explain different applications of Magic tee?
18) With the help of Magic tee explain the operation of circulator?
19) State properties of ferrites and also state different ferrite devices?
20) Explain the working of isolator and circulator?

21) Define different parameters such as

  • Isolation
  • Insertion loss
  • Coupling factor
  • Directivity
22) State different application of isolator and circulator?
23) Explain the concept of VSWR and skin depth?

24) Whose VSWR will be maximum for the following case and explain why justify?

  • Case I- open terminal
  • Case II- short terminal
  • Case III- match terminal
25) State features and applications of network analyser?
26) How to measure the RF power?
27) In case of directional coupler what are the typical values of coupling and directivity?

28) Explain how to measure microwave frequency?

  • Using direct frequency metre
  • Using theoretical formula
29) State range of microwave frequency band?
30) State frequency range X-band?

PART II : Question based on units

Unit I : Transmission Lines and Waveguides

1) Write different Applications of Micro-waves
2) Difference between TEM,TE and TM nodes of electro magnetic waves
3) State different types of wave guides

4) Explain concept of

  • Rectangular cavity resonater
  • Circular waveguide cavity resonator

Unit II: Microwave Components

Explain the construction and operation of gyrator
Explain concept of straplines and also state difference types and their applications

Unit III: Microwave Network Analysis

Explain the Concept of impedance , admittance
Write down the z-matrix,y-matrix , transmission(ABCD) matrix for 2-port network

Unit IV: Microwave Tubes

Explain concept of velocity modulation and bunching process with the help of Applegate Diagram for

  • Two cavity klystron
  • Reflect klystron
  • Multi –cavity klystron

Compare above three Klystron's related to following points

  • Construction and principle of operation
  • Oscillating mode
  • o\p characteristics
  • efficiency
  • electronic and mechanical tuning

Explain the concept of magnetron and also define following terms

  • Hull cut off condition
  • Modes of resonance
  • PI mode of operation
  • O/P characteristics
  • Applications

What do you mean by slow wave devices? Also state Advantages and applications.

Explain the construction and working of helix TWT

Unit V : Microwave Solid State Devices

State – structural detail , principle of operation , specifications and application of following microwave Solid state devices

  • FET
  • Varactor DIODE
  • PIN diode
  • Shottky Barier diode
  • Tunnel diode
  • TED’S
  • Gunn Diode
  • Impatt Diode
  • Trapatt Diode

Unit VI : Microwave measurement

Explain how following devices can be used for Micro-wave measurement

  • Slotted line
  • Tunable detector
  • VSWR meter
  • Power meter


  • Questions by Dr. S.K. Jagtap ,HOD, SKNCOE and Prof Sujit Wagh, SKNCOE
  • Edited by Lokhande Shubham, Jadhav Maruti, Harshit Kumar WikiNote Volunteer
  • WikiNote Foundation
Created by Sujit Wagh on 2017/10/09 15:26