STUPIDSID
1 (a)
What are the applications of Microwaves?
5 M
1 (b)
Can TEM mode exist in hollow waveguide? Justify your answer.
5 M
1 (c)
What are O-type and M-type devices in microwave?
5 M
1 (d)
Explain the terms: Cut-off frequency, Dominant mode, Phase velocity, Group velocity.
5 M
2 (a)
Derive wave equation for TE wave and obtain all the field components in a rectangular waveguide.
10 M
2 (b)
Explain the action of isolator and circulator using ferrites, mention their typical applications.
10 M
3 (a)
Draw a neat diagram of two cavity Klystron amplifier and explain the bunching process. Derive the equation of velocity modulation.
10 M
3 (b)
An X-band pulsed cylindrical magnetron has the following parameters:
Anode voltage: Vo = 2.6x104V
Beam current: Io=27A
Flux density: Bo=0.336Wb/m2
Radius of cathode cylinder: a=5 cm
Radius of vane edge to centre: b=10 cm
Compute the cyclotron angular frequency
the cut off voltage for a fixed B and
the cut off magnetic flux density for a fixed Vo.
Anode voltage: Vo = 2.6x104V
Beam current: Io=27A
Flux density: Bo=0.336Wb/m2
Radius of cathode cylinder: a=5 cm
Radius of vane edge to centre: b=10 cm
Compute the cyclotron angular frequency
the cut off voltage for a fixed B and
the cut off magnetic flux density for a fixed Vo.
10 M
4 (a)
Draw and explain two-hole directional coupler. Define coupling factor, directivity and isolation. Derive S matrix for the same.
10 M
4 (b)
Explain Gunn Effect with the two valley model of Gunn diode. What are the criteria that a semiconductor must satisfy in order to exhibit negative resistance?
10 M
5 (a)
What are slow wave structures? Explain how helical TWT does amplification.
10 M
5 (b)
Describe the types of strip lines in brief.
5 M
5 (c)
Explain the excitation of modes in circular waveguides.
5 M
6 (a)
Explain the methods used for power measurement in microwaves.
10 M
6 (b)
With the help of sketch distinguish between IMPATT and TRAPATT diode.
10 M
Write short notes on any three:-
7 (a)
Limitations of conventional tubes at microwave frequencies.
7 M
7 (b)
Waveguide attenuators.
7 M
7 (c)
Measurement of VSWR.
7 M
7 (d)
Microwave transistors.
7 M
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