STUPIDSID
Solve any one question from Q1 and Q2
1 (a)
The TE10 mode is propagated in a rectangular waveguide of dimensions
a = 6cm and b = 4 cm, by means of a travelling detector. The distance between a maximum and minimum is found to be 4.55 cm. Find the
frequency of the wave.
7 M
1 (b)
State different types of stripline and distinguish between Stripline and
Microstrip line in detail.
7 M
1 (c)
What is the significance of scattering matrix? Write the properties of
S-matrix.
6 M
2 (a)
Explain the terms with respect to waveguide:
i) Dominant Mode.
ii) Cut-off Frequency.
iii) Guide Wavelength.
i) Dominant Mode.
ii) Cut-off Frequency.
iii) Guide Wavelength.
7 M
2 (b)
Explain any two applications of circulator.
7 M
2 (c)
The collinear ports 1 and 2 of a Magic Tee are terminated by impedances
of reflection coefficients ρ1=0.5 and ρ2=0.6. The difference port 4 is
terminated by an impedance with reflection coefficient of 0.8. If 1W
power is fed at sum port 3, calculate the power reflected at port 3 and
the power divisions at the other ports.
6 M
Solve any one question from Q3 and Q4
3 (a)
What are the limitations of conventional tubes at microwave frequencies
and how to overcome these limitations?
9 M
3 (b)
How the oscillations are sustained in Cavity Magnetron? Explain the
process of phase focusing effect.
9 M
4 (a)
Explain the operation of Travelling Wave Tube with its slow wave
Structure.
9 M
4 (b)
A two cavity Klystron amplifier has the following specifications:
Beam Voltage : V0 = 900 V
Beam Current : I0 = 30 mA
Frequency : f = 8GHz
Gap spacing in either cavity : d = 1mm
Spacing between centers of cavities : L = 4cm
Effective shunt impedance : Rsh: 40kΩ
Determine:
i) The electron velocity.
ii) The dc transit time of electron.
iii) The input voltage for maximum output voltage.
iv) The voltage gain in decibels.
Beam Voltage : V0 = 900 V
Beam Current : I0 = 30 mA
Frequency : f = 8GHz
Gap spacing in either cavity : d = 1mm
Spacing between centers of cavities : L = 4cm
Effective shunt impedance : Rsh: 40kΩ
Determine:
i) The electron velocity.
ii) The dc transit time of electron.
iii) The input voltage for maximum output voltage.
iv) The voltage gain in decibels.
9 M
Solve any one question from Q5 and Q6
5 (a)
Draw equivalent circuit of Varactor diode. Explain in detail its construction and operation.
8 M
5 (b)
Explain principle of operation, IV characteristics and equivalent circuit of microwave Tunnel diode.
8 M
6 (a)
Explain Gunn effect using two valley model. Mention its typical characteristic and applications of Gunn diode.
8 M
6 (b)
With suitable expression explain power frequency limitations of microwave transistor.
4 M
6 (c)
In a Gunn diode with active length 20&mulm, the drift velocity of electrons is 2*107 cm/s. Calculate natural frequency of the diode and its critical
Voltage.
4 M
Solve any one question from Q7 and Q8
7 (a)
Explain any two methods of measuring impedance of a terminating load in a microwave system.
8 M
7 (b)
Enlist methods of measuring the Q of a cavity resonator. Explain any one method in detail.
8 M
8 (a)
Explain with neat block diagram power measurement of microwave generator using
i) Bolometer.
ii) Calorimeter.
i) Bolometer.
ii) Calorimeter.
8 M
8 (b)
Describe in detail the techniques used for VSWR measurement.
8 M
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