Master of Science I (Electronics Science)
Examination: Oct Nov 2016 Semester II (New CBCS)
SLR No. Day
Date Time Subject Name Paper
No. Seat No.
SLR SJ
342
Saturday
19/11/2016
10:30 A.M
to
1:00 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 questions carry equal marks.
Total Marks: 70
Q.1 Objective Questions. 14
Select correct alternatives: 06
According to IEEE microwave frequency bands, the frequency range of
C-band is
1GHz to 2GHz 2GHz to 4GHz
4GHz to 8GHz 8GHz to 12GHz
Which of the following is not a Maxwell's equation,
The dominant mode in a particular waueguide is the mode having the
Lowest cut off
frequency
Middle frequency
Highest cutoff
frequency
None of the done
One of the following modes cannot exist in a rectangular waveguide,
TE mode TEM mode
TM mode None of the above
The passive elements used to limit microwave power in a transmission
line is called as
Isolators Phase shifters
Attenuators None of the above
The periodic fluctuations of current passing thru the n-type GaAs
specimen was discovered by
J. B. Gunn B.C. Reloach
R.C. Johnston B.G. Cohen
State True or false: 08
In TM waves, there is no component of magnetic field in the direction
of propagation.
A line terminated in its characteristic impedance has a standing waves
ration of unity.
Page 1 of 2
The reflex klystron over comes the disadvantages of the two cavity
klystron.
The wave in the TWT is a propagating wave.
In waveguides, the electric and magnetic fields are confined to the space
within the guide only.
The quality factor of a microstrip line is very high which may be
required for high quality resonant MICs.
Impedance matching is very desirable in transmission lines.
The Gunn diode is always operated in the negative resistance region.
Q.2 Write short notes: 14
Microwave Spectrum 05
Microwave tubes 05
Stripline attenuator 04
0
Q.3 Derive the TE mode field equations in a rectangular waveguide. 10
Write the Maxwell's equations in both differential and integral forms. 04
Q.4 With necessary diagram, explain the construction and working of a reflex
klystron.
10
Explain the Gunn effect. 04
Q.5 Discuss the various Co-axial and stripline components. 10
Give an account on impedance matching. 04
Q.6 With neat Diagram, explain the construction and working of waveguide
attenuators.
10
Write a note on waveguide terminations. 04
Q.7 With neat sketch, explain the working of phase shifters. 10
Write a note on standard mismatches. 04