B.TechSemester 62024-25Microwave EngineeringBEC064

Microwave Engineering (BEC064) - AKTU Question Paper 2024-25

B.Tech · Semester 6 · Free PDF Download

This is the official AKTU Microwave Engineering Previous Year Question Paper for B.Tech Semester 6, academic session 2024-25. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 6

Session:2024-25

University:AKTU / UPTU

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Questions Asked in 2024-25

Microwave Engineering (BEC064) — complete question paper · 70 marks · 3 Hours

Section AAttempt all q u e s t i o n s i n b r i e f . 0 2 x 7 = 1 4

b
Differentiate TE wave and TM wave?
c
What is the principle of phase shifter?
d
Mention the dominant modes of a rectangular and circular waveguide?
e
Why low frequency parameters are not used in microwaves?
f
Write the unitary properties of S matrix?
g
What is the significance of VSWR measurements?

Section BAttempt any three o f t h e f o l l o w i n g : 0 7 x 3 = 2 1

a
Explain the operation of reflex klystron with neat diagram?
b
Write short notes on power sensors used for microwave power measurement?
c
Identify the important points about Backward wave Crossed fi eld amplifier
d
Explain following terms (a)E-p lane Tee (b) H-plane Tee (c) Magic Tee
e
Explain clearly how a GUNN diode is different from a tunnel Diode Both A & B being negative resistance devices

Section CAttempt any one p a r t o f t h e f o l l o w i n g : 0 7 x 1 = 0 7

a
Derive the characteristic equations of Transverse Electric w ave. A parallel plane wave guide with plate separation of 0.03 m with TE10 mode is excited at 6 GHz. Find the cutoff frequency, cutoff wavelength, guide wavelength and group velocity?
b
Discuss how a decrease in drift velocity with increasing ele ctric field can lead to the formation of a high field domain for microwave generation and amplification?
a
A 20db directional coupler gives 3dbm in output power throug h coupled port. If the Isolation specified as 55 dB, find the power available at the Isolated Port?
b
Derive the S –matrix for n-port network. Prove that the S-Ma trix for a reciprocal network is symmetric
a
Analyze the theory of oscillations in a magnetron. Examine t he expressions for Hull Cut off magnetic and voltage equations
b
What is the bunching process of a two-cavity klystron? Defin e optimum bunching distance Lopt. and derive the expression for it?

A travelling wave tube operates under the following paramete rs: Beam voltage Vo=

3kV; Bean current Io = 30mA; Characteristics impedance of helix  Zo = 10 ohm;
Circuit length = N=50 m; Frequency f = 10 GHz. Determine (i) Ga in parameters, (ii)
Output power Ap in dB

b
Discuss the VSWR, impedance, wavelength and frequency measur ement using slotted line method
a
Give the classification of so lid state microwave devices along with examples? Explain Two Valley Model Theory?
b
Mention how a TWT can be converted to an oscillator. Explain the operation of such a device. Why large tuning range, are possible with such a device?

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

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