III B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 ANTENNA AND WAVE PROPAGATION Common to Electronics And Telematics, Electronics And Communication Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Define and explain:
ld .
i. effective aperture ii. gain iii. directivity for an antenna. What is the effective aperture of an isotropic antenna operating at a wavelength of 10−2 m.
or
(b) An antenna has a radiation resistance of 72 Ω, and a power gain of 12 db. Find its radiation efficiency and directivity if its resistance is 4 Ω. [10+6] 2. (a) Distinguish between different types of corner reflectors. Hence explain the radiation characteristics of a square corner reflector.
uW
(b) Explain the radiation characteristics of small loop antennas. Why is a small loop antenna treated as a dual of short electric dipole? [8+8] 3. (a) Derive expressions for vector magnetic and scalar electric potentials. Explain the concept of retarded potentials. (b) Obtain expressions for potential fields due to sinusoidally varying sources and bring out the importance of Lorentz gauge condition. [8+8] 4. (a) Derive an array factor of an uniform linear array of N identical elements and find the width of principal lobe in case of broad side array?
nt
(b) What are the conditions for the linear array of N isotropic elements to radiate in end fire and broad side modes? [8+8]
5. (a) Explain the difference between driven and parasitic elements in an array. (b) “Most of the long wire antennas are resonant”, state true or false and explain.
Aj
(c) Explain the reasons why the lengths of a traveling wave radiator is multiple of half wave lengths. [6+5+5]
6. (a) List out the different types of feeds used for parabolic reflectors and distinguish between them bringing out their merits and demerits. (b) Compare the performance characteristics of parabolic reflectors and lens antenna. [8+8]
7. (a) Explain the 3-antenna method of measurement of the gain of a horn antenna with necessary relations. 1
Code No: 15034
NR
Set No - 1
(b) List out and explain the set of principal plane patterns required for a circularly polarized antenna case. [8+8] 8. Discuss the theory of formation of ionospheric regions. Describe the properties of different ionospheric regions with special reference to seasonal variations. [16]
Aj
nt
uW
or
ld .
in
?????
2
Code No: 15034
NR
Set No - 2
in
III B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 ANTENNA AND WAVE PROPAGATION Common to Electronics And Telematics, Electronics And Communication Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
1. Discuss the theory of formation of ionospheric regions. Describe the properties of different ionospheric regions with special reference to seasonal variations. [16] 2. (a) Define and explain:
or
i. effective aperture ii. gain iii. directivity for an antenna. What is the effective aperture of an isotropic antenna operating at a wavelength of 10−2 m.
(b) An antenna has a radiation resistance of 72 Ω, and a power gain of 12 db. Find its radiation efficiency and directivity if its resistance is 4 Ω. [10+6]
uW
3. (a) Explain the 3-antenna method of measurement of the gain of a horn antenna with necessary relations. (b) List out and explain the set of principal plane patterns required for a circularly polarized antenna case. [8+8] 4. (a) List out the different types of feeds used for parabolic reflectors and distinguish between them bringing out their merits and demerits. (b) Compare the performance characteristics of parabolic reflectors and lens antenna. [8+8]
nt
5. (a) Derive expressions for vector magnetic and scalar electric potentials. Explain the concept of retarded potentials. (b) Obtain expressions for potential fields due to sinusoidally varying sources and bring out the importance of Lorentz gauge condition. [8+8]
Aj
6. (a) Distinguish between different types of corner reflectors. Hence explain the radiation characteristics of a square corner reflector. (b) Explain the radiation characteristics of small loop antennas. Why is a small loop antenna treated as a dual of short electric dipole? [8+8]
7. (a) Explain the difference between driven and parasitic elements in an array. (b) “Most of the long wire antennas are resonant”, state true or false and explain. (c) Explain the reasons why the lengths of a traveling wave radiator is multiple of half wave lengths. [6+5+5] 3
Code No: 15034
NR
Set No - 2
8. (a) Derive an array factor of an uniform linear array of N identical elements and find the width of principal lobe in case of broad side array? (b) What are the conditions for the linear array of N isotropic elements to radiate in end fire and broad side modes? [8+8]
Aj
nt
uW
or
ld .
in
?????
4
Code No: 15034
NR
Set No - 3
in
III B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 ANTENNA AND WAVE PROPAGATION Common to Electronics And Telematics, Electronics And Communication Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
1. (a) Explain the 3-antenna method of measurement of the gain of a horn antenna with necessary relations. (b) List out and explain the set of principal plane patterns required for a circularly polarized antenna case. [8+8] 2. (a) Define and explain:
or
i. effective aperture ii. gain iii. directivity for an antenna. What is the effective aperture of an isotropic antenna operating at a wavelength of 10−2 m.
uW
(b) An antenna has a radiation resistance of 72 Ω, and a power gain of 12 db. Find its radiation efficiency and directivity if its resistance is 4 Ω. [10+6] 3. (a) Derive an array factor of an uniform linear array of N identical elements and find the width of principal lobe in case of broad side array? (b) What are the conditions for the linear array of N isotropic elements to radiate in end fire and broad side modes? [8+8] 4. (a) List out the different types of feeds used for parabolic reflectors and distinguish between them bringing out their merits and demerits.
nt
(b) Compare the performance characteristics of parabolic reflectors and lens antenna. [8+8]
5. (a) Explain the difference between driven and parasitic elements in an array. (b) “Most of the long wire antennas are resonant”, state true or false and explain.
Aj
(c) Explain the reasons why the lengths of a traveling wave radiator is multiple of half wave lengths. [6+5+5]
6. (a) Distinguish between different types of corner reflectors. Hence explain the radiation characteristics of a square corner reflector. (b) Explain the radiation characteristics of small loop antennas. Why is a small loop antenna treated as a dual of short electric dipole? [8+8]
7. Discuss the theory of formation of ionospheric regions. Describe the properties of different ionospheric regions with special reference to seasonal variations. [16] 5
Code No: 15034
NR
Set No - 3
8. (a) Derive expressions for vector magnetic and scalar electric potentials. Explain the concept of retarded potentials. (b) Obtain expressions for potential fields due to sinusoidally varying sources and bring out the importance of Lorentz gauge condition. [8+8]
Aj
nt
uW
or
ld .
in
?????
6
Code No: 15034
NR
Set No - 4
in
III B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 ANTENNA AND WAVE PROPAGATION Common to Electronics And Telematics, Electronics And Communication Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
1. Discuss the theory of formation of ionospheric regions. Describe the properties of different ionospheric regions with special reference to seasonal variations. [16]
2. (a) List out the different types of feeds used for parabolic reflectors and distinguish between them bringing out their merits and demerits. (b) Compare the performance characteristics of parabolic reflectors and lens antenna. [8+8]
or
3. (a) Derive an array factor of an uniform linear array of N identical elements and find the width of principal lobe in case of broad side array? (b) What are the conditions for the linear array of N isotropic elements to radiate in end fire and broad side modes? [8+8]
uW
4. (a) Explain the 3-antenna method of measurement of the gain of a horn antenna with necessary relations. (b) List out and explain the set of principal plane patterns required for a circularly polarized antenna case. [8+8] 5. (a) Define and explain:
nt
i. effective aperture ii. gain iii. directivity for an antenna. What is the effective aperture of an isotropic antenna operating at a wavelength of 10−2 m.
(b) An antenna has a radiation resistance of 72 Ω, and a power gain of 12 db. Find its radiation efficiency and directivity if its resistance is 4 Ω. [10+6]
Aj
6. (a) Distinguish between different types of corner reflectors. Hence explain the radiation characteristics of a square corner reflector. (b) Explain the radiation characteristics of small loop antennas. Why is a small loop antenna treated as a dual of short electric dipole? [8+8]
7. (a) Explain the difference between driven and parasitic elements in an array. (b) “Most of the long wire antennas are resonant”, state true or false and explain. (c) Explain the reasons why the lengths of a traveling wave radiator is multiple of half wave lengths. [6+5+5] 7
Code No: 15034
NR
Set No - 4
8. (a) Derive expressions for vector magnetic and scalar electric potentials. Explain the concept of retarded potentials. (b) Obtain expressions for potential fields due to sinusoidally varying sources and bring out the importance of Lorentz gauge condition. [8+8]
loop antenna treated as a dual of short electric dipole? [8+8]. 7. (a) Explain the difference between driven and parasitic elements in an array. (b) âMost of the long ...
III B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 · MANAGERIAL ECON. ... What are the merits and limitations of Pay Back period? How does ...
[8+4+4] · 8. (a) Write a short note on the factors influencing the performance of turbines? (b) Obtain an expression for the specific speed of a turbine? [8+8]. *****.
Consider a brick wall (0.7 W/m K) of thickness 30 cm. The inner surface is at · 280C and the outer surface is exposed to cold air with heat transfer coefficient of 36.
8. (a) Why trap circuits are added in video amplifier to attenuate frequency Spec- · trum occupied by FM sound signal? What is the undesired effect of sound · signal in reproduced picture? (b) Discuss relative merits of cathode and grid modulation of
Present a program schema for a FIFO branch and bound search for a Least - Cost answer node. [16]. 7. (a) Write an algorithm of Quick sort and explain in detail.
A steel rod 28 mm diameter is fixed concentrically in a brass tube of 42 mm outer ... Circular · ii. Square · iii. Hollow circular with inner radius half the outer radius.
iii. Domain. [2+2+3] · 4. (a) Develop an example showing how a single locking protocol could lead to a ... (b) What is the oldest log record that we need to retain?
is assumed as an ideal gas, prepare a P-x-y diagram for this system at 50 oC. ... lnp2 sat / Kpa = 16.059381 - 3644.297/(t oC +239.765). [16]. 3. AjntuWorld.in ...
(a) Give the classification of solid state Microwave devices along with examples? (b) Why conventional tubes and solid state devices can not be used at ...
2. 5. Derive equations to describe the displacement diagram of a cam which rises with ... cam rotation angle is à Plot the displacement diagram and its first three ...
5. (a) What is meant by ignition delay? Name and describe the two components of · ignition delay period. What is the importance of delay period? Should the.
PRODUCTION PLANNING AND CONTROL · Mechanical Engineering ... the symbols used in drawing Gantt chart. [6+10] · 6. (a) Explain how a computer can be ...
(b) What is Narrow Band FM ? Draw the block diagram of Armstrong FM gen- · erator. Bring out the role of frequency multiplier and down converters. [8+8].
(b) Draw the internal circuit diagram and pin diagram (DIP) of 566 VCO. Explain its operation and derive expression for output frequency fo. [8]. 1. AjntuWorld.in ...
(b) Write the code for printing the message 'IBM PC ASSEBLY LANGUAGE · PROGRAMMING' ... 3. (a) What is the BIOS memory location of the keyboard buffer?
t, and VSWR. [8M] · 4. (a) Write Maxwell's equations in point form as well as in integral form. Then give · the word statements of the these field equations. [8M] · (b) A copper wire carries conduction current of 1 amp at 60 Hz. What is the · displac
Determine the heat transferred during the process and the final pressure. [16] · 8. (a) A gas mixture consisting of 20% ethane and 80% oxygen at 298K is burned.
(b) Explain how number of page faults can be calculated for the given page trace · using FIFO page replacement strategy. (Assume 3 frames are available in the.
(a) Differentiate between transmission path, virtual path and virtual circuit. [6] · (b) Explain link state routing with an example. [10] · 2. (a) Does the TC sublayer ...
Figure 5. 7. (a) Derive the expression for potential at any point due to a point charge Q and also write electric field in rectangular co ordinate system. [8]. 3.
