Muthal Murai Paartha Neyabagam

Muthal Murai Paartha Nyabagam
Uyirinil Thanthu Pogiraai
Ithayathil Yaeno Or Baaram
Mayai Varum Maalai Naeraththil
Manathinil Vanthu Pogiraai
Vizhiyinil Aeno Oru Eeram

Sila Naeram Maayam Seithaai
Sila Naeram Kaayam Seithaai
Madi Meethu Thoonga Vaithaai
Maru Naalil Aaenga Vaithaai
Veyila Mazhaiya Valiya Sugama Ena Nee..
Neethaane En Ponvasantham
Neethaane En Ponvasantham
Ponvasantham Ponvasantham

Muthal Murai Paartha Nyabagam
Uyirinil Thanthu Pogiraai
Ithayathil Yaeno Or Baaram
Mayai Varum Maalai Naeraththil
Manathinil Vanthu Pogiraai
Vizhiyinil Aeno Oru Eeram

Neenthi Varum Nilavinilae
Or Aayiram Nyabagangal
Neenganedum Kanaavinilae
Nooraayiram Thee Alaigal
Nenjemenum Vinaakkalukkul
En Bathil Enna Pala Varigal
Serum Idam Vilaasathilae Un Paarvayin Mugavarigal
Oodalil Ponathu Kaalangal
Ini Thaedida Naerangal Illaiyae
Thaedalil Nee Varum Oosaigal
Angu Ponathu Un Thadam Illaiyae
Kaathal Endral Verum Kaayangala?
Athu Kaathalukku Adaiyaalangalaa??

Veyila Mazhaiya Valiya Sugama Ena Nee..
Neethaane En Ponvasantham
Neethaane En Ponvasantham
Ponvasantham Ponvasantham

Muthal Murai Paartha Nyabagam
Uyirinil Thanthu Pogiraai
Ithayathil Yaeno Or Baaram
Mayai Varum Maalai Naeraththil
Manathinil Vanthu Pogiraai
Vizhiyinil Aeno Oru Eeram

Sila Naeram Maayam Seithaai
Sila Naeram Kaayam Seithaai
Madi Meethu Thoonga Vaithaai
Maru Naalil Aaenga Vaithaai
Veyila Mazhaiya Valiya Sugama Ena Nee..
Neethaane En Ponvasantham
Neethaane En Ponvasantham.

Yevan Endru Ninaithai

Yevan Endru Ninaithai
Aethai Kandu Sirithai
Vithai Ondru Mulaikaiyil
Velipadum Muzhu Roopam

Neruppukku Piranthaan
Niththan Niththam Malarnthaan
Vaelai Vanthu Saerumbodhu
Velipadum Suyaroopam

Yar Endru Purigiratha
ivan Thee Endru Therigiratha
Thadaigalai Vendrae Sarithiram Padaiththavan
Nyabagam Varugiratha

Yaarukkum Adimai Illai
Ivan Yaarukkum Arasan Illai
Kaadugal Thaandi Kadakkindra Pozhuthum
kaatukku Kaayam Illai

Yavan Endru Ninaithai
Aethai Kandu Sirithai
Vithai Ondru Mulaikaiyil
Velipadum Pudhu Roopam

Neruppukku Piranthan
Niththan Niththam Malarnthaan
Vaelai Vanthu Saerumbodhu
Velipadum Suyaroopam

Allah-u-Raq Allah-Mae-Raq
Avarathu Adimaigal Aanoamae
Allah-u-Raq Allah-Mae-Raq
Avarathu Adimaigal Aanoam

Chinna Chinna Anuvaai Mannukkulae Kidapaan
Vettupadum Velaiyilae Velipadum Visshwaroopam
Enna Roopam Eduppan Evarukku Theriyum
Sonna Roopam Maatri Maatri Edupaan Vishwaroopam

Yar Endru Purigiratha
ivan Thee Endru Therigiratha
Thadaigalai Vendrae Sarithiram Padaiththavan
Nyabagam Varugiratha

Yaarukkum Adimai Illai
Ivan Yaarukkum Arasan Illai
Kaadugal Thaandi Kadakkindra Pozhuthum
kaatukku Kaayam Illai

Roopam Roopam Roopam Roopam
Roopam Roopam Roopam Roopam
Roopam Roopam Vishwaroopam

Allah-u-Raq Allah-Mae-Raq
Avarathu Adimaigal Aanoamae
Allah-u-Raq Allah-Mae-Raq
Avarathu Adimaigal Aanoam

Sainthu Sainthu Nee Paarkumbothu

Sainthu Sainthu Nee Paarkumbothu Adadaa Hey Hey..
Saernthu Saernthu Nizhal Pogumbothu Adada Hey Hey Hey..
Vizhiyodu, Vizhi Paesa,
Viralodu, Viral Paesa, Adada Veru Enna Pesa..
Sainthu Sainthu Nee Paarkumbothu Adadaa Hey Hey..
Saernthu Saernthu Nizhal Pogumbothu Adada Hey Hey Hey..
Hey Hey Hey..

En Thaayai Pola Oru Pennai Thedi
Unnai Kandu Kondaen..
Oh.. En Thanthai Thozhan, Ondraana Aanai
Naan Kandu Kondaen..
Azhagaana Un Koonthal Maakolam..
Athai Kaetkum Enthan Vaasal..
Kaalam Vanthu Vanthu Kolamidum..
Un Kannai Paarthaalae.. Mun Jenmam Povaenae..
Angae Neeyum Naanum Naam..

Sainthu Sainthu Nee Paarkumbothu Adadaa Hey Hey..
Saernthu Saernthu Nizhal Pogumbothu Adada Hey Hey Hey..

Kai Veesi Kaatril, Nee Paesum Azhagil, Meiyaagum Poiyum..
En Maarbil Veesum, Un Koonthal Vaasam, Aetho Seiyum..
En Veetil Varum Un Paatham.. Ennaalum Ithu Pothum..
Innum Innum Enna Tholai Thooraththil..
Aal Yaarum Paarkaamal Thadayangal Illamal,
Anbaal Unnai Naanum Kolvaen..

Sainthu Sainthu Nee Paarkumbothu Adadaa Hey Hey..
Saernthu Saernthu Nizhal Pogumbothu Adada Hey Hey Hey..
Vizhiyodu, Vizhi Paesa,
Viralodu, Viral Paesa, Adada Veru Enna Pesa..
Sainthu Sainthu Nee Paarkumbothu Adadaa Hey Hey..
Saernthu Saernthu Nizhal Pogumbothu Adada Hey Hey Hey..
Hey Hey Hey..

ANTENNAS AND WAVE PROPAGATION--Question Bank

ECE Department Question Bank
Subject Name : ANTENNAS AND WAVE PROPAGATION                       Branch:ECE Subject Code  : 10144EC604                                                             Year / Sem. : III/VI
Unit – I
Part - A
1	Define retarded vector potential.
2	Define radiation resistance of an antenna.
3	Calculate the radiation resistance of a λ/10 wire dipole in free space.
4	An antenna whose radiation resistance is 300 ohm operates at a frequency of 1 GHz     and with a current of 3Amp.Find the radiated Power.
5	What is meant by oscillating electric dipole?
6	Distinguish between induction field and radiation field.
7	State the differences between half wave dipole and quarter wave monopole.
8	Define: Electric vector potential.
9	A short vertical transmitting antenna erected on the surface of a perfectly      conducting earth produce an rms field strength Eө=100sinӨ mv/m at a distance of      1km from the antenna.calculate the total power radiated by the antenna.
10	Define antenna efficiency
11	Define Hertzian dipole.
	Part - B
11	a)Derive an expression for the power radiated and radiation resistance of a small           current element.  (8) b) At what distance in wavelength, is the radiation component of magnetic field       be equal and twice the induction component.     (8)
12	a)When the amplitude of the magnetic field in a plane wave is 2A/m.      i) Determine the magnitude of the electric field for the plane wave in free space.      ii) Determine the magnitude of the electric field when the wave propagates in a medium which is characterized by σ =0, µ= µ0 and ε = ε0                                                   (8)        b) Derive an expression for the radiation field from an infinitesimal Dipole       and also write the expressions for far field and near field regions    (8)
13	a)Derive an expression for the radiation field from a half wave dipole            (10) b) A dipole antenna with length equal to 10cm and carrying a current of 1A at a          frequency of 108 /2π hertz radiates into free space. Calculate the electric field          intensity at a distance of r=10km from the antenna, where the induction field is           negligible.                                                                                                            (6)
14	a)      Explain retarded vector potential.                                                (4)       b)   A plane electromagnetic wave having a frequency of 100 MHz has an averaging pointing vector of 1 W/m2.If the medium is lossless with relative permeability 2 and relative permittivity 3. Find i) velocity of propagation. ii) Wavelength.                                  (12)
15	a)      Derive an expression for the radiation field from a small current element  (8) b)      A half wave dipole is radiating into free space. The co-ordinate system is defined so that the origin is at the center of the dipole and the Z axis is aligned with the dipole. Input power to the diploe is 100W.Assuming an overall efficiency of 50%, find the power density (in w/m2) at r=500m, θ=60,φ=0.                                                      (8)
16	a)An antenna whose radiation resistance is 300 ohm operates at a frequency of 1 GHz and with a current of 3 amps. Find the radiated power.                                                   (3) b)A half wave dipole with a total loss resistance of 1Ω, is connected to a generator whose internal impedance is 50+j25 Ω. Assuming that the peak voltage of the generator is 2 V and the impedance of the dipole excluding the loss resistance is 73+j42.5 Ω, find the power supplied by the source.                                                                                                        (3) c) What do you mean by induction field and radiation field?                         (5) d) Find the radiation resistance of a hertizian dipole of length λ/40, λ/60, and λ/80.   (5)

Unit – II
Part - A
1	Distinguish between broadside array and end fire array.
2	Define Ferrite loop.
3	An antenna has a radiation resistance of 72 ohm. A loss resistance of 8 ohm and power  gain of 12 db. Determine the antenna efficiency and directivity.
4	What is the maximum effective aperture of a microwave antenna with a directivity of 900?
5	A linear broadside array consists of 4 equal isotropic in phase, point source with   λ /3 spacing. Calculate the directivity, beam width and HPBW.
6	State the reciprocity theorem for two antennas.
7	Define array factor.
8	What are grating lobes?
9	An antenna with omni directional amplitude pattern with a half power beam width of 90 degrees has radiation intensity of U=sinnq.Determine the value of ‘n’
10	State pattern multiplication
11	Define radiation intensity
12	Mention the two important advantages of folded dipole antenna
13	Give the significance of Friss transmission formula.
	Part - B
1	a. Calculate the field for an array of two isotropic sources of same amplitude           and phase for d=3l/4.                                                                                   (8)  b. The radiation intensity of an antenna is given by U (q,F) = {B0 sinq sin2F     , where 0£F£p, 0£F£p        0                          , elsewhere.                                (8)                 Determine the maximum directivity
2	a.  Derive an expression for radiated field due to small circular loop              antenna.                                                                                                       (10)           b. Derive an expression relating directivity, gain and effective length.              (6)
3	a. Show that the relative E (F) pattern of an array of two identical isotropic in               phase point sources are arranged in fig 1.is given by E (F) = cos [dr/2 sin F               where dr=2pd/l.                                                                                          (8)     b. In a microwave communication link, two identical antennas operating at 10             GHz are used with power gain of 40 db. If the transmitted power is 1 W. Find             the received power, if the range of the link is 30 km.                                          (8)
4	.     a. Explain the operation of helical antenna in normal mode of operation.        (8) b. A uniform linear array consists of 16 isotropic point sources with a spacing of     l/4, if the phase difference d= -90 degrees. Calculate i) HPBW ii) Beam solid     Angle iii) Effective aperture iv) Directivity.                                                   (8)
5	a) For an array of 2 isotropic point sources, fed with currents of same magnitude but, in phase quadrature, determine the radiation pattern. Evaluate the null directions and directions of maxima and draw the pattern.                                                                                  (10) b) Explain the principle of pattern multiplication with an example.                        (6)
6	Derive  the formula to find the maxima, null points and half power points of an N element broadside  array and show that the first minor lobe is 13.46 dB down from the major lobe.(16)

Apditude Questions(1-20) Date: 12-03-13

1: There is a toy train that can make 10 musical sounds. It makes 2 musical sounds after being
defective. What is the probability that same musical sound would be produced 5 times
consecutively? ( 1 of _____) ?
Answer: 1/2 * 1/2 * 1/2 * 1/2 * 1/2 = 1/32
32 will be the answer.
 
2: Peter and Paul are two friends. The sum of their ages is 35 years. Peter is twice as old as Paul was when Peter was as old as Paul is now. What is the present age of Peter?
Answer: 20 years.

3: The ages of two friends is in the ratio 6:5. The sum of their ages is 66.After how many years will the ages be in the ratio 8:7?
Answer: 12 years.
 
4: (There was a long story, I'll cut short it). There are 5 materials to make a perfume: Lilac,
Balsalmic, Lemon, Woody and Mimosaic. To make a perfume that is in demand the following
conditions are to be followed: Lilac and Balsalmic go together. Woody and Mimosaic go
together, Woody and Balsalmic never go together. Lemon can be added with any material.
(Actually they had also mentioned how much amount of one can be added with how much
quantity of the other; but that's not needed for the question.) All of the following combinations
are possible to make a perfume EXCEPT:
1) Balsalmic and Lilac
2) Woody and Lemon
3) Mimosaic and Woody
4) Mimosaic and Lilac
Answer: Mimosaic and Lilac.
 
 5: A girl has to make pizza with different toppings. There are 8 different toppings. In how many ways can she make pizzas with 2 different toppings.
Answer: 8 * 7 = 56
    
  6: A triangle is made from a rope. The sides of the triangle are 25 cm, 11 cm and 31 cm. What will be the area of the square made from the same rope?
Answer:280.5625
 
 7: What is the distance between the z-intercept from the x-intercept in the equation
ax+by+cz+d=0. (I do not remember the values of a,b,c,d)
 
 8: An athlete decides to run the same distance in 1/4th less time that she usually took. By how much percent will she have to increase her average speed?
Answer: 33.33%
 
 9: A horse chases a pony 3 hours after the pony runs. Horse takes 4 hours to reach the pony. If the average speed of the horse is 35 kmph, what s the average speed of the pony?
 
10: There is 7 friends (A1,A2,A3....A7).If A1 have to have shake with all with out repeat. How
many hand shakes possible?
 

 11: There are two pipes A and B. If A filled 10 liters in a hour B can fills 20 liters in same time. Likewise B can fill 10, 20, 40, 80,160….if B filled in (1/16) th of a tank in 3 hours, how much time will it take to fill completely?
Answer:7 hours
 
 12: (Keywords): Sports readers,10 tables,4chairs per table, each table has different number of people then how many tables will left without at least one person?
Ans : 6
 
 13: The ages of two friends is in the ratio 5:6. After how many years will the ages be in the ratio 7:8?
Answer: 10 years.
 
 14: What is the distance of the z-intercept from the x-intercept in the equation ax+by+cz+d=0. (I do not remember the values of a,b,c,d)
 
 15: An athlete decides to run the same distance in 1/4th less time that she usually took. By how much percent will she have to increase her average speed?
Answer: 33.33%
 
 16. A man whose age is 45 yrs has 3 sons named John,jill,jack. He went to a park weekly
twice.he loves his sons very much. On a certain day he find # shopkippers sailing different
things. An apple cost 1penny, 2chocalate costs 1penny.& 3 bananas cost 1 penny. He has
bought equal no. of apple, chocolate & banana for each son. If the total amount he invest is
7 penny then how many he has bought from each piece for his son?
a)1app,1cho,1 banana
b)1 app,2cho,3 banana
c)1app,2cho,1banana
 
 17. A scientist was researching on animal behavior in his lab. He was very interested in
analyzing the behavior of bear. For some reason he travelled 1mile in north direction & reached at north pole.there he saw a bear .he then followed the bear around 1 hr with a speed of 2km/hr in east direction.After that he travelled in south direction & reached at his lab in2 hrs. Then what is the colour of the bear? I think ans is white
a)white b)black c)gray d)brown
 
 18. In a particular city there are 100 homes numbered from 1,2,3………..100. Thecity was
build by a builder from chennei. There was 45 shop in the town which was build by a
builder from Mumbai. THE 2nd builder can build the in ½ time as compared to 1st builder. If the 2nd builder builds in 15 days,then how many 2’s are used by the builder from Chennai in numbering the 100 homes?
a)17 b)18 c)19 ans d) 20 c)19
 
 19.MR dash has 3 sons whose ages are respectively a,b,c. The grandfather has bought a
cycle for the eldest son, mother has bought a bag for the youngest one which cost Rs150/.
The sum of two age of the elder son & one son is 15.The difference of age of sons is 3 &
2.Then what is the age of the eldest son?
a)10, b)11, c) 12,d)13
 
 20. We all know that Arya bhatta is the greatest mathematics belongs to india . When his
daughter Mayabati was in her teen age he discovered a problem. At that time the age of
mayabati is a prime number,let that age is a. After some years her age becomes b. then
Arya Bhatta was able to solve that problem wit the help of he daughter mayabati. If a-b=5
& product of a& b is 26 then what is the sum of two squares?
A)77 b) 45 c)89 d)67