RR
Code No: 26020
Set No - 1
III B.Tech II Semester Supplimentary February2010 III B.Tech II Semester SupplimentaryExaminations, Examinations,February 2010 MICROWAVE ENGINEERING Electronics And Communication Engineering Time: 3 hours
Max Marks: 80
in
Answer any FIVE Questions All Questions carry equal marks ????? 1. Write short notes on the following
ld .
(a) Tuning screw in wave-guide. (b) Fixed attenuator. (c) Characteristics of Tee junctions.
[5+5+6]
2. (a) What are Ferrites? Derive the scattering matrix of an isolator.
[8+8]
or
(b) State and prove S matrix properties of a lossless junction.
3. (a) Discuss the commercial and industrial application of microwaves. (b) Show that the maximum electronic efficiency of Reflex Klystron Oscillator is 22.7%.. [6+10]
The The The The The
mode of operation cut off frequency phase constant propagation constant wave impedance.
nt
i. ii. iii. iv. v.
uW
4. (a) A rectangular wave-guide has a cross section of 1.5 cm x 0.8 cm, σ=0, µ= µ0 and ∈= 4∈0 . The is given as magnetic field component 3πy 11 cos Sin (π × 10 t − β z) A/m Hx = 2Sin πx a b Determine
(b) Write short notes on “Rectangular resonant Cavity”.
[10+6]
5. (a) Write short notes on “ Microwave frequency measurement”
Aj
(b) Draw a neat sketch of a microwave test bench for making impedance measurements, naming the various components connected. [8+8]
6. (a) What are slow wave structures? Explain how a helical TWT achieves amplification, using such a structure. (b) Compare the performance characteristics and applications of the following devices. i. Klystron Oscillator ii. BWO.
[8+8]
1
Code No: 26020
RR
Set No - 1
7. (a) A magnetron is operating in the Π mode and has the following specifications, N=10, f= 3MHz, a = 0.4cm, b= 0.9 cm, l = 2.5 cm, V0 = 18 KV, B = 0.2 wb/m2 . Determine
(b) What are Hatree harmonics? Explain in detail.
in
i. the angular velocity of the electron. ii. The radius at which radial forces due to electric and magnetic fields are equal and opposite.
[8+8]
ld .
8. (a) What are the properties of parametric up converter and down converter? What are their applications?
(b) Explain the principle and working of a GUNN diode oscillator? Give a neat sketch of the oscillator at X-band. [8+8]
Aj
nt
uW
or
?????
2
Set No - 2
RR
Code No: 26020
III B.Tech II Semester Semester Supplimentary Examinations,February III B.Tech II Semester Supplimentary Examinations, February2010 2010 MICROWAVE ENGINEERING Electronics And Communication Engineering Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
in
Time: 3 hours
ld .
1. (a) What are the properties of parametric up converter and down converter? What are their applications?
(b) Explain the principle and working of a GUNN diode oscillator? Give a neat sketch of the oscillator at X-band. [8+8] 2. Write short notes on the following
(b) Fixed attenuator.
or
(a) Tuning screw in wave-guide. (c) Characteristics of Tee junctions.
[5+5+6]
uW
3. (a) A magnetron is operating in the Π mode and has the following specifications, N=10, f= 3MHz, a = 0.4cm, b= 0.9 cm, l = 2.5 cm, V0 = 18 KV, B = 0.2 wb/m2 . Determine i. the angular velocity of the electron. ii. The radius at which radial forces due to electric and magnetic fields are equal and opposite. (b) What are Hatree harmonics? Explain in detail.
[8+8]
nt
4. (a) Write short notes on “ Microwave frequency measurement” (b) Draw a neat sketch of a microwave test bench for making impedance measurements, naming the various components connected. [8+8]
5. (a) Discuss the commercial and industrial application of microwaves.
Aj
(b) Show that the maximum electronic efficiency of Reflex Klystron Oscillator is 22.7%.. [6+10]
6. (a) A rectangular wave-guide has a cross section of 1.5 cm x 0.8 cm, σ=0, µ= µ0 and ∈= 4∈0 . The is given as magnetic field component 3πy 11 cos Sin (π × 10 t − β z) A/m Hx = 2Sin πx a b Determine i. The mode of operation ii. The cut off frequency iii. The phase constant 3
Code No: 26020
RR
Set No - 2
iv. The propagation constant v. The wave impedance. (b) Write short notes on “Rectangular resonant Cavity”.
[10+6]
7. (a) What are Ferrites? Derive the scattering matrix of an isolator. [8+8]
in
(b) State and prove S matrix properties of a lossless junction.
8. (a) What are slow wave structures? Explain how a helical TWT achieves amplification, using such a structure.
i. Klystron Oscillator ii. BWO.
ld .
(b) Compare the performance characteristics and applications of the following devices. [8+8]
Aj
nt
uW
or
?????
4
Set No - 3
RR
Code No: 26020
III B.Tech II SemesterSupplimentary Semester Supplimentary Examinations,February III B.Tech II Semester Examinations, February2010 2010 MICROWAVE ENGINEERING Electronics And Communication Engineering Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
in
Time: 3 hours
The The The The The
mode of operation cut off frequency phase constant propagation constant wave impedance.
or
i. ii. iii. iv. v.
ld .
1. (a) A rectangular wave-guide has a cross section of 1.5 cm x 0.8 cm, σ=0, µ= µ0 and ∈= 4∈0 . The is given as magnetic field component 3πy πx 11 Hx = 2Sin a cos b Sin (π × 10 t − β z) A/m Determine
(b) Write short notes on “Rectangular resonant Cavity”.
[10+6]
uW
2. (a) A magnetron is operating in the Π mode and has the following specifications, N=10, f= 3MHz, a = 0.4cm, b= 0.9 cm, l = 2.5 cm, V0 = 18 KV, B = 0.2 wb/m2 . Determine i. the angular velocity of the electron. ii. The radius at which radial forces due to electric and magnetic fields are equal and opposite. (b) What are Hatree harmonics? Explain in detail.
[8+8]
nt
3. (a) Write short notes on “ Microwave frequency measurement” (b) Draw a neat sketch of a microwave test bench for making impedance measurements, naming the various components connected. [8+8]
4. Write short notes on the following
Aj
(a) Tuning screw in wave-guide.
(b) Fixed attenuator. (c) Characteristics of Tee junctions.
[5+5+6]
5. (a) Discuss the commercial and industrial application of microwaves. (b) Show that the maximum electronic efficiency of Reflex Klystron Oscillator is 22.7%.. [6+10] 6. (a) What are slow wave structures? Explain how a helical TWT achieves amplification, using such a structure. 5
Code No: 26020
RR
Set No - 3
(b) Compare the performance characteristics and applications of the following devices. i. Klystron Oscillator ii. BWO.
[8+8]
in
7. (a) What are the properties of parametric up converter and down converter? What are their applications? (b) Explain the principle and working of a GUNN diode oscillator? Give a neat sketch of the oscillator at X-band. [8+8]
ld .
8. (a) What are Ferrites? Derive the scattering matrix of an isolator. (b) State and prove S matrix properties of a lossless junction.
Aj
nt
uW
or
?????
6
[8+8]
Set No - 4
RR
Code No: 26020
III B.Tech II Semester Semester Supplimentary Examinations,February III B.Tech II Semester Supplimentary Examinations, February2010 2010 MICROWAVE ENGINEERING Electronics And Communication Engineering Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
in
Time: 3 hours
ld .
1. (a) What are slow wave structures? Explain how a helical TWT achieves amplification, using such a structure.
(b) Compare the performance characteristics and applications of the following devices. i. Klystron Oscillator ii. BWO.
[8+8]
The The The The The
mode of operation cut off frequency phase constant propagation constant wave impedance.
uW
i. ii. iii. iv. v.
or
2. (a) A rectangular wave-guide has a cross section of 1.5 cm x 0.8 cm, σ=0, µ= µ0 and ∈= 4∈0 . The is given as magnetic field component 3πy πx 11 Hx = 2Sin a cos b Sin (π × 10 t − β z) A/m Determine
(b) Write short notes on “Rectangular resonant Cavity”.
[10+6]
3. (a) Write short notes on “ Microwave frequency measurement”
nt
(b) Draw a neat sketch of a microwave test bench for making impedance measurements, naming the various components connected. [8+8]
Aj
4. (a) A magnetron is operating in the Π mode and has the following specifications, N=10, f= 3MHz, a = 0.4cm, b= 0.9 cm, l = 2.5 cm, V0 = 18 KV, B = 0.2 wb/m2 . Determine i. the angular velocity of the electron. ii. The radius at which radial forces due to electric and magnetic fields are equal and opposite.
(b) What are Hatree harmonics? Explain in detail.
[8+8]
5. (a) What are the properties of parametric up converter and down converter? What are their applications? (b) Explain the principle and working of a GUNN diode oscillator? Give a neat sketch of the oscillator at X-band. [8+8] 7
Code No: 26020
RR
Set No - 4
6. (a) What are Ferrites? Derive the scattering matrix of an isolator. (b) State and prove S matrix properties of a lossless junction.
[8+8]
7. Write short notes on the following (a) Tuning screw in wave-guide.
in
(b) Fixed attenuator. (c) Characteristics of Tee junctions.
[5+5+6]
8. (a) Discuss the commercial and industrial application of microwaves.
Aj
nt
uW
or
?????
ld .
(b) Show that the maximum electronic efficiency of Reflex Klystron Oscillator is 22.7%.. [6+10]
8
