Important RGPV Question
EC-702 (A) Microwave Engineering
VII Sem, EC
Unit I
Q.1 List out various applications of Microwave and briefly explain any two of them.(RGPV Dec 2024)
Q.2 Draw the structure and explain the velocity modulation process in two cavity klystron amplifier.(RGPV Dec 2024)
Q.3 Discuss the dominant and higher order modes in strip line structure.(RGPV Dec 2024)
Q.4 Write an introductory note on Microwave Signals. Elaborate some of the practical applications of microwaves.(RGPV Nov 2023)
Q.5 Give a brief comparison on micro strip lines and slot lines with suitable examples. (RGPV Nov 2023)
Q.6 Elaborate the dominant and higher order modes in strip line structure.(RGPV Nov 2023)
Q.7 Describe with a neat sketch the constructional details and principle of operation of a reflex klystron tube. (RGPV Nov 2022)
Q.8 A helix travelling wave tube is operated with a Beam current of 300 mA, beam Voltage of 5 kV, characteristic Impedance of 20. What length of helix will be selected to give an output power gain of 500 db at 10 GHz. (RGPV Nov 2022)
Q.9 With the support of a diagram, explain the operation of Eight Cavity Magnetron. (RGPV Nov 2022)
Unit II
Q.1 Mentioned the basic Principle of IMPATT and TRAPATT diodes.(RGPV Dec 2024)
Q.2 What are the different solid state microwave sources use in industries? Explain its practical uses in today’s world. (RGPV Nov 2023)
Q.3 Derive a basic relations for Microwave BJT and FET circuits. (RGPV Nov 2023)
Q.4 Derive a relation for frequency multipliers. Discuss its operating principle to be use in different microwave devices.(RGPV Nov 2023)
Q.5 Draw and explain the block diagram of frequency converters using Schottky diodes. Schottky
Q.6 Discuss various modes of operation of Tunnel diode and Gunn Diode. (RGPV Nov 2023)
Q.7 With neat diagram, explain the construction and characteristics of tunnel diode. (RGPV Nov 2022)
Q.8 Derive the expressions for power output and efficiency of TRAPATT diode. Mention its applications and performance characteristics. (RGPV Nov 2022)
Q.9 Ann-type GaAs Gunn diode has following parameters: (RGPV Nov 2022)
Electron drift velocity: v_{d} = 2.5 * 10 ^ 5 * m / s
Negative electron mobility: mu_{u} = 0.015m ^ 2 / v s.
Relative dielectric constant: e, = 13.1.
Determine the criterion for classifying the modes of operation.
Unit III
Q.1 Explain the coupling factor and directivity of the four ports directional coupler. Also derive the S-matrix for completely matched four-port directional coupler.(RGPV Dec 2024)
Q.2 What is standing wave? Derive the equation of Voltage Standing Wave Ratio (VSWR) in terms of reflection coefficient. (RGPV Dec 2024)
Q.3 Discuss the reasons due to which the measurement of Z, Y, h and ABCD parameter are difficult at microwave frequencies. Elaborate the S-parameters for the multi-port network along with any two properties.(RGPV Dec 2024)
Q.4 Derive and analyze the results of S parameters in microwave circuits.(RGPV Nov 2023)
Q.5 Derive the equation of Voltage Standing Wave Ratio (VSWR) in terms of reflection coefficient. (RGPV Nov 2023)
Q.6 Explain the diode phase shifter. Discuss the principle of broadband and tuned detectors. Diode phase shifter (RGPV Nov 2023)
Q.7 Using the properties of scattering matrix of a lossless, reciprocal microwave junction, prove that for a four port network if all the four ports are matched, the device shall be a directional coupler. (RGPV Nov 2022)
Q.8 The S parameters of a two port network are given by S 11 =0.2 angle 0 deg , S 22 =0.1 angle 0 deg , S_{12} = 0.6 angle 90 deg and S 21 =0.6 angle 90 deg . Find when port 2 circuited. (RGPV Nov 2022)
Unit IV
Q.1 Mentioned the symbol and schematic diagram of microwave circulator. Explain the working of the same using geometry containing two magic tee and one phase shifter along with its simplified S-matrix.(RGPV Dec 2024)
Q.2 A rectangular waveguide with dimension of 3 x 2 cms operates in TM11 mode at 10 GHz. Determine the characteristic wave impedance. (RGPV Dec 2024) ,(RGPV Nov 2023)
Q.3 “Impedance transformer plays a vital role in microwave devices”. Support your answer with some practical application work. application (RGPV Nov 2023)
Q.4 Explain YIG resonator. Analyze your answers and elaborate their practical known applications. (RGPV Nov 2023)
Q.5 Explain the bolometric method of measuring microwave power. (RGPV Nov 2022)
Q.6.Explain different types of directional couplers with neat sketches and derive the S-matrix for directional coupler. (RGPV Nov 2022)
Q.7 Explain about Circulator and Isolator with its working principle. (RGPV Nov 2022)
Q.8 Explain the properties of E-Plane tee and give reasons why it is called series tee. (RGPV Nov 2022)
Unit V
Q.1 List different types of Magnetrón. Explain mechanism of oscillations of Magnetron Oscillator with diagram. .(RGPV Dec 2024)
Q.2 With reference to RF transistor amplifier, enumerate the considerations for stability and gain. (RGPV Nov 2022)
Q.3 With neat diagram explain the various types of attenuators and phase shifters. (RGPV Nov 2022)
Extra Questions
Q.1 An open wire transmission line has the following primary constants R = 4Omega / k * m L = 2.5mH / k * m C = 0.009mu*F / k * m G = 0.29mu*mho / k * m and Frequency of operation is 1 kHz. Determine the following parameters(RGPV Dec 2024)
i) Z
ii) a
iii) β
iv) Phase Velocity
Q.2 For the dominant mode of operation in an air filled circular waveguide of inner diameter 4 cms. Find:(RGPV Dec 2024)
i) Cut off wavelength
ii) Guided wave length
iii) Cut off frequency
Q.3 An air-filled circular waveguide has a radius of 2 cm and is to carry energy at a frequency of 10 GHz. Find all the TE and TM modes for which energy transmission is possible.(RGPV Dec 2024)
Q.4 The S-parameters of a two-port network are given by(RGPV Dec 2024)
S_{11} = 0.2 < 0 ^ a S_{21} = 0.6 < 90 deg
S_{22} = 0.1 < 0 deg S_{12} = 0.6 < 90 deg
ii) Find the return loss at port 1 when po circuited.
If the network is reciprocal
Q.5 Write short note (Any four) (RGPV Dec 2024)
a) MASER
b) Tuned Detectors
c) BARITT
d) Microwave resonators
e) Power measurement bridges
f) TWT Amplifier
Q.6 Write short note (any four)(RGPV Nov 2023)
a) Reflex klystron
b) TEM mode of operation
c) Circulators
d) Isolators
e) IMPATT
Q.7 Explain about the effective dielectric constants, losses and Q-factor of microstrip lines? (RGPV Nov 2022)
Q.8 Examine with neat diagrams the fabrication process of MMICS. (RGPV Nov 2022)
— Best of Luck for Exam —
