Master of Science II (Electronics-Communication Science)
Examination: Oct Nov 2016 Semester II (Old CGPA)
SLR No. Day
Date Time Subject Name Paper No. Seat No.
SLR SJ
346
Saturday
19/11/2016
10:30 A.M
to
01:00 P.M
Microwave Engineering
C
VI
Instructions: Q.No.1 and 2 are compulsory.
Answer any three questions from Q.No.3 to Q.No.7.
All question carry equal marks.
Q.1 Objective Questions. 14
Choose the correct alternatives. 08
In conductor, the current density at a point
is a scalar point function is a vector point function
may be scalar or vector
point function
always tends to infinity
Microwaves are used for
telephonic radio broadcast
TV systems all of the above
Which of the following device uses a helix
klystron amplifier klystron oscillator
TWT both a c
The frequency of oscillation obtained from a klystron depends mainly on
resonant frequency of
cavity
repeller voltage
voltage of focusing
electrode
characteristic of cathode
In a circular waveguide with radius the dominant mode is
TM01 TE01
TM11 TE11
Points in the microwave system baseband signals either originate or
terminate
terminator terminal stations
Terminating equipment terminal equipment
When the screw length is in the waveguide, its nature is
Capacitive Inductive
Resistive None of the above
If a matched attenuator is connected between a resistive load and
coaxial line the SWR will be
more than 3 less than 3
equal to 3 either a or c
Page 1 of 2
State True or false/ justify one line answer. 06
At a conductor to conductor boundary, component of field tangent to the
boundary is same in the two conductors.
Maxwell's equation, from Ampere, in phasor form is
Reflex Klystron oscillator is essentially a low power device.
In a circular waveguide TE21 mode has lowest cutoff frequency.
A matched termination absorbs all the power incident on it.
A coaxial line is a non reading line.
Q.2
Answer in brief. 14
Enumerate the basic advantages of microwaves and briefly discuss the
typical application of microwaves.
05
How waveguides are different from normal two wire transmission lines.
Discuss the similarities and dissimilarities.
05
Write a note on TEM to TEM transitions. 04
Q.3 Starting from Maxwell's equations device wave equation for rectangular
wave guide.
08
Write a short note about strip line transmission lines. 06
Q.4 With a neat diagram, explain the working of reflex klystron oscillator. 08
Explain two valley model theory of Gunn diodes. 06
Q.5 Derive the wave equations for TM wave and obtain all the field components
in a rectangular waveguides.
10
Explain in brief about coaxial lines. 04
Q.6 Discuss in detail the design considerations and working of coaxial and
stripline attenuators.
10
Explain the construction and working of standard coaxial connector. 04
Q.7 List the types of waveguide phase shifters and discuss the working of one in
detail.
10
With a neat sketch describe the waveguide matching terminations. 04