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JNTU ONLINE EXAMINATIONS [Mid 2 - awp]

1. The length of subsequent directors of yagi - uda antenna reduces progressively by [01D01]a. 2.5 %b. 13 %c. 10 %d. 15 %

2. The distance between reflector & driven element in yagi - uda antenna is [01M01]a.b.c.d.

3. Spacing between director and direcor of yagi uda antenna is [01M02]a.b.c.d.

4. The length of reflector of yagi - uda antenna is [01S01]a. 0.48 b. 0.28 c. 0.18 d. 0.3

5. The driven element in yagi-uda antenna is [01S02]a. folded dipoleb. reflectorc. lensd. horn

6. The length of driven element of yagi -uda antenna in meters is [01S03]a.b.

c.d.

7. The length of reflector of yagi -uda antenna in meters is [01S04]a.b.c.d.

8. The length of first director of yagi -uda antenna in meters is [01S05]a.b.c.d.

9. Spacing between reflector and driven element of yagi Uda antenna is [01S06]a.b.c.d.

10. Spacing between director and driven element of yagi uda antenna is [01S07]a.b.c.d.

11._ _ _ _ _ _ _ polarization results in more signal strength [02D01]a.

horizontalb. vertical

c. left circular


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d. right circular12. The diameter of elements in yagi Uda antenna is [02M01]

a. 1 to 1.2 cmb. 2 to 10 cmc. 3 to 5 cmd. 10 to 20 cm

13. Less reflection & reduced ghost images possible with _ _ _ _ polarized yagi uda [02M02]a. horizontalb. verticalc. left circulard. right circular

14. The adverse effect of closer radiators in yagi uda array is [02S01]a. lowering of input impedance of arrayb. increasing of input impedance of arrayc. lowering of output impedance of arrayd. constant input impedance of array

15. For maximum pickup, the receiving yagi uda antenna is mounted [02S02]a. horizontallyb. verticallyc. 300 inclinedd. 600 inclined

16. A hollow conductor in yagi uda antenna is preferred because of [02S03]a. skin effectb. miller effectc. fermat effectd. debye effect

17. In fringe area installation, _ _ _ _ _ _ _ used along with yagi uda antenna to improvereception [02S04]

a. booster amplifierb. buck amplifierc. all pass filterd. operation amplifier

18. The gain of yagi uda six element antenna for operation at 500 MHz is [02S05]a. 11dBib. 20dBic. 100dBid. 5dBi

19. The length of reflector element of yagi uda six element antenna for operation at 500 MHz is[02S06]

a. 28.8 cmb. 40 cmc. 100 cmd. 10 .8cm

20. For 5 element yogi Uda (UHF & VHF TV channels) reflector length LR is [02S07]a. 0.15 b. c. 0.1d. 2

21. The field pattern in the horizontal plane for corner reflector at a distance r fromantenna is [03M01]

a.b.c.d.

22. If the feed to vertex distance d is made equal to side length L in reflector then the aperturewidth is [03M02]

a. 1.414 Lb. 2Lc. 1.6L


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d. 1.334L23. A corner reflector without an exciting antenna can be used as [03S01]

a. passive reflectorb. active reflectorc. lensd. dipole

24. The corner angle for passive reflector is [03S02]a. 900b. 500c. 100d. 800

25. In grid type of reflector the spacing between conductors is [03S03]a.b.c.d.

26. The height of conductors( for /2 driven element antenna) in grid type of reflector is[03S04]

a.b.c.d.

27. Compared to isolated /2 antenna, corner reflector antenna power gain will be _ _ _ _times higher [03S05]

a. 10 to 20b. 30 to 50c. 20 to 60d. 40 to 50

28. One of the following uses corner reflector antenna [03S06]a. point to point communicationb. televisionc. radio astronomyd. internet

29. If corner angle is 900 then range of corner to dipole spacing is [03S07]a.b.c.d.

30. The relative field pattern E in the plane of the driven /2 element of a square cornerreflector is [04D01]

a.b.c.d.

31. The normalized field pattern E( ) for paraboloid with uniformly illuminated aperture isgiven by [04D02]

a.b.c.d.

32. A square corner reflector has a spacing of /4 between the driven /2 element and thecorner. The directivity is [04M01]

a. 12.8 dBib. 15.8 dBic. 121.8 dBid. 19.8 dBi

33. If corner angle is 1800 then range of corner to dipole spacing is [04S01]a.b.


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c.d.

34. A square corner reflector has a driven /2 element. The distance between the drivenelement and corner is /2 . The terminal impedance of driven element is [04S02]

a. 125 ohmb. 150 ohmc. 100 ohmd. 200 ohm

35. A square corner reflector has a driven /2 element. The distance between the drivenelement and corner is /2 . The half power beam width in is [04S03]

a. 600b. 900c. 450d. 1200

36. A square corner reflector has a driven /2 element. The distance between the drivenelement and corner is /2 . The half power beam width in is [04S04]

a. 420b. 500c. 450d. 300

37. A square corner reflector has a driven / 2 element. The distance between the drivenelement and corner is /2 Directivity from impedance of driven & image dipoles is `[04S05]

a. 11.9 dBib. 20.9 dBic. 30.9 dBid. 3 dBi

38. A square corner reflector has a driven /2 element. The distance between the drivenelement and corner is /2 Directivity from HPBWs is [04S06]

a. 11.4 dBib. 20.4 dBic. 13.4 dBid. 15.3 dBi

39. For large circular apertures, the beam width between first nulls is [04S07]a.b.c.d.

40. The directivity D of a large uniformly illuminated circular aperture is [05D01]a.b.c.d.

41. The field intensity ratio in the aperture plane for parabolic reflector is [05M01]a.b.c.d. 1

42. The beam width between half power points for a large circular aperture is [05S01]a.b.c.d.

43. The F/D for parabolic reflector is [05S02]a. 0.25 to 0.5b. 0.5 to 5c. 5 to 10d. 4 to 8

44. The distance from any point P on a parabolic curve to a fixed point F is called [05S03]


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a. focusb. vertexc. feed pointd. cassegrain

45. A parabolic reflector have a [05S04]a. directional feedb. offset feedc. vertex feedd. isotropic feed

46. To make the field completely uniform across the aperture would require a feed pattern with[05S05]

a. inverse taperb. exponential taperc. uniform taperd. non uniform taper

47. The loss in aperture due to feed antenna blockage avoided by using [05S06]a. offset feedb. directional feedc. Horn feedd. Dipolefeed

48. The flared out wave guide is also known as [05S07]a. Horn antennab. Yagi-uda antennac. dipoled. paraboloid

49. For optimum horn antenna, optimum length ,L is [06D01]a.b.c.d.

50. If = 0.2 , length L = 62.5 , then the pyramidal horn antenna flare angle in E- plane is[06D02]

a. 9.10b. 10c. 50d. 60

51. For pyramidal horn directivity,D is [06M01]a.b.c.d.

52. Beam width between first nulls for optimum E-plane rectangular Horn is [06M02]a.b.c.d.

53. If a and b are mouth dimensions in Z & Y directions L is horn length from mouth to apexthen `a` is [06S01]

a.b.c.d.

54. For optimum Horn antenna , optimum is [06S02]a.b.c.

d.

55. If = 0.2 and E plane aperture aE = 10 , then length L for pyramidal horn is [06S03]


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a.b.c.d.

56. If E-plane aperture of pyramidal antenna is aE = 10 , then HPBW(E-plane) [06S04]a. 5.60b. 20c. 100d. 80

57. If H plane aperture of pyramidal antenna is aH = 13.7 , then HPBW(H-plane) [06S05]a. 4.90b. 100c. 60d. 20

58. Beam width between first nulls for optimum H- plane rectangular horn is [06S06]a.b.c.

d.

59. For pyramidal horn antenna, if h is height in E -plane & w is width in H-plane, the powergain Gp is [07D01]

a.b.c.d.

60. If A is elemental area , E is magnitude of radiated field generated by A , d is thedistance to A , is angle with respect to an axis that is perpendicular to mouth ofparabolic antenna then strength of electric field at A is [07D02]

a.b.c.d.

61. Beam width between half power points for optimum H-plane rectangular horn is [07M01]a.b.c.d.

62. Typical value of for H-plane horn antenna is [07M02]a. 0.4b. 0.3c. 0.1d. 1

63. If a and b are mouth dimensions in Z & Y directions L is horn length from mouth to apex.then half power beam widths in degrees in H plane is [07M03]

a.b.c.d.

64. Beam width between half power points for optimum E-plane rectangular horn is [07S01]a.b.c.d.

65. If a and b are mouth dimensions in Z & Y directions L is horn length from mouth to apex.Then `b` is [07S02]

a. 0.81 ab. 0.98a


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c. 2ad. 0.5a

66. If a and b are mouth dimensions in Z & Y directions L is horn length from mouth to apex.then gain is [07S03]

a.b.c.d.

67. If a and b are mouth dimensions in Z & Y directions, L is horn length from mouth to apex.then half power beam widths in degrees in E plane is [07S04]

a.b.c.d.

68. the field across the mouth of horn antenna is [07S05]a. section of spherical wave frontb. elliptical wave frontc. triangular wave frontd. rectangular wave front

69. According to fermat`s principle, R/ 0 is equal to [08D01]a.b.c.d.

70. Delay type lens antennas regarded basically as [08D02]a. end fire antennas with poly rodb. broadside antennas with poly rodc. end fire antennas with dipoled. broadside antennas with dipole

71. Many element yagi uda antenna is a [08M01]a. rudimentary lensb. dielectric lensc. directord. poly rod

72. One of the following material is used for constructing dielectric lens [08M02]a. Luciteb. Paraffinc. Teflond. Wax

73. If the flare angles of horn are too large the field across the mouth considered to be [08S01]a. not equi phase fieldb. equi phase fieldc. rectangular fieldd. triangular field

74. One of the following applied to delay lenses antennas [08S02]a. electrical path length is increased by lens mediumb. electrical path length is decreased exponentially by lens mediumc. electrical path length is unaltered by lens mediumd. electrical path length is decreased linearly by lens medium

75. One of the following applied to fast lenses antennas [08S03]a. electrical path length is increased exponentially by lens mediumb. electrical path length is decreased by lens mediumc. electrical path length is unaltered by lens mediumd. electrical path length is increased linearly by lens medium

76. One of the following is a delay type lens antenna [08S04]a. Dielectric lensb. E plane metal plate lensc. EH metal plate


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d. Horn77. One of the following is a delay type lens antenna [08S05]

a. H plane metal lensb. E plane metal plate lensc. EH metal plated. Horn

78. One of the following material is used for constructing dielectric lens [08S06]a. Polystyreneb. Paraffinc. Teflond. Wax

79. For a cylindrical lens field ratio is [09D01]a.b.c.d.

80. The thickness Z of a zone step in zoned lens is [09M01]a.b.c.d.

81. For non magnetic materials, index of refraction n is [09M02]a.b.c.d.

82. One of the following is valid according to Fermat's principle [09S01]a. all paths from source to plane surface are of equal electrical lengthsb.

all paths from source to plane surface are of unequal electrical lengthsc. all paths from source to load surface are of equal electrical lengths

d. some paths from source to plane surface are of equal electrical lengths83._ _ _ _ _ _ _ illumination of aperture suppresses minor lobes in lens antennas [09S02]

a. taperb. Uniformc. randomd. zero

84. To avoid resonance effect in artificial dielectric lens antennas the size of metal particlesshould be [09S03]

a. small compared to design wave lengthb. 10 times larger compared to design wave lengthc. 20 times larger compared to design wave lengthd. equal to design wave length

85. The maximum particle dimension( parallel to electric field) in artificial dielectric lensantennas is [09S04]a. less than /4b. equal toc. greater than /2d. 2

86. To avoid diffraction effects the spacing between the particle in artificial dielectric lensantennas is [09S05]

a. less thanb. equal toc. greater thand. 20

87. Polarization of artificial dielectric in lens antenna is [09S06]a. Nqlb. nq/lc. nq/l2


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d. Nl/q88. The effective relative permittivity of an artificial dielectric of conductive spheres in r is

[09S07]

a. 1+4 prod Na3b. 1-4 prod Na3c. 1+4 prod Na4d. 1-4 prod Na2

89. The effective index of refraction of an artificial dielectric of conducting spheres is [10D01]

a.b.c.d.

90. The equation for the contour of the zoned lens is [10D02]a.b.c.d.

91. The effective dielectric constant of artificial dielectric medium in lens antenna is [10M01]a.b.c.d.

92. The effective relative permeability of an artificial dielectric of conducting spheres is[10M02]

a.b.c.d.

93. The disadvantage of E plane metal plate lens is [10S01]a. frequency sensitiveb. frequency independentc. phase sensitived. phase independent

94. The disadvantage of H plane metal plate lens is [10S02]a. unsymmetrical aperture illumination in E planeb. symmetrical aperture illumination in E planec. unsymmetrical aperture illumination in H planed. symmetrical aperture illumination in H plane

95. According to MUELLER & TYRRELL, the directivity of poly rod antenna is [10S03]a.b.c.d.

96. According to MUELLER & TYRRELL, the HPBW of poly rod antenna is [10S04]a.b.c.d.

97. A properly designed lens produces [10S05]a. a plane wave frontb. spherical wave frontc. elliptical wave frontd. non uniform plane wave front

98. The conducting strips in lens antenna are [10S06]


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a. parallel to electrical fieldb. perpendicular to electrical fieldc. inclined to electrical fieldd. perpendicular to magnetic field

99. The efficiency of power transfer between a generator and load is [11D01]a.b.c.d.

100. According to FRIIS transmission formula, power received is [11D02]a.b.c.d.

101. The refractive index of LUNEBURG lens is [11M01]

a.b.c.d.

102. The gain of antenna under test (AUT) is [11M02]a.b.c.d.

103. With radar technique gain of antenna under test (AUT) is [11M03]a.b.c.d.

104. Total gain of antenna under test (AUT) interms of gain of AUT at horizontalpolarization GH & vertical polarization Gv is [11S01]

a.b.c.d.

105. The focusing action of lens antenna is [11S02]a. sensitive to frequencyb. independent of frequencyc. insensitive to phased. insensitive to frequency and phase

106. The phase velocity in lens antenna depends on [11S03]a. frequencyb. phasec. delayd. square of frequency

107. In antenna parameter measurements distance between primary and secondaryantenna should be [11S04]

a.b.c.d.108. If r is distance between primary (transmitter) and secondary (receiver) antenna ,

then r is [11S05]


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e.f.g.h.

119. Electric field for space wave is [13M01]a.b.c.d.

120. For smooth surface roughness R is [13S01]a. < 0.1b.

> 20c. 10

d. 5121. When the incident wave is near grazing over a smooth earth the reflection

coefficient is [13S02]

a. -1.0b. -2c. 1d. 10

122. The attenuation function dependent on [13S03]a. distance , frequency, constants of earthb. distance & radiationc. constants of earth & delayd. phase, constants of earth & radiation

123. For un attenuated surface wave, the attenuation function is [13S04]a. 1b. 10c. 5d. 2

124. At =0, un attenuated surface attenuation function ( at low frequency and goodground conductivity) value is [13S05]

a. 2b. 10c. 5d. 0

125. At =0 , surface of earth ground wave attenuation factor A is [13S06]a.b. F-10c. F2d. 0

126. For surface wave numerical distance depends on [13S07]a. frequency, ground constants, actual distance to transmitterb. frequency, ground constantsc. phase, frequency, ground constantsd. ground constants, actual distance to transmitter

127. The phase constant `b` is a measure of [13S08]a. power factor angle of earthb. ground constantc. numerical distanced. attenuation factor

128. For vertical dipole antenna over a plane earth , electric field is [14D01]a.


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b.c.d.

129. Space wave field of a horizontal dipole in the plane perpendicular to axis ofdipole is [14D02]

a.b.c.d.

130. Real part of conductivity of ionized gas is [14M01]a.b.c.d.

131. For a wave propagating in a dielectric medium of permittivity, & incident upon asecond medium of , the reflection coefficient of horizontally polarized wave,Rh is [14M02]

a.b.c.d.

132. If earth constant and frequency are such that ,then earth will be [14S01]a. resistive[100 ohms]b. reactivec. conductived. resistive(1000 ohms)

133. The numerical distance interms of phase constant b and forsurface wave is [14S02]

a.b.c.d.

134. If earth constant and frequency are such that x > > in r then power factor angle is[14S03]

a. 0b. 10c. 2d. 5

135. If earth constant and frequency are such that x > > in r ,then earth will be [14S04]a. resistiveb. inductivec. conductived. capacitive

136. Approximate value of collision frequency in Ionosphere is [14S05]a.b.c.d.

137. E region extends from [14S06]a. 90 - 130 kmb. 20 - 30 kmc. 40 - 50 kmd. 1 - 10 km

138.

In the plane parallel to axis of dipole the space wave field is [15D01]

a.


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b.c.d.

139. The ratio of horizontal to vertical field will be [15D02]

a.b.c.d.

140. Reflection factor for vertical polorization Rv is [15D03]

a.b.c.d.

141. The horizontal component of electric field of surface wave Eh is [15M01]a.b.c.d.

142. For VHF propagation between elevated antennas, one of the following is considered[15S01]

a. surface wave neglectedb. surface wave consideredc. sky wave neglectedd. space wave neglected


a. is very smallb. =100c. =90d. =50


a.b.c.d.

145. A vertically polarized wave at the surface of earth will have [15S04]a. forward tiltb. backward tilt of 10c. no tiltd. backward tilt of 20

146. The vertical component of electric field of surface wave Ev is [15S05]a.b.c.d.

147. The magnitude of surface wave tilt depends on [15S06]a. conductivity & permittivity of earthb. reactivity of earthc. permeability of earthd. permeability & permittivity of earth

148. For a wave propagating in a dielectric medium of permittivity, & incident upon asecond medium of , the reflection coefficient of vertically polarized wave, RV is[16D01]


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a.b.c.d.

149. The refractivity of atmosphere, N is [16M01]

a. (77.6 / T) P +( 4810 e / T)b. (77.6 / T) +( 4810 e / T)c. P +( 4810 e / T)d. (77.6 / T) P +( 4810 e )

150. Radius of curvature of earth is [16M02]a.b.c.d.

151. The curvature of the earth affects the propagation of [16S01]a. ground wave signalb. sky wave signalc. surface wave signald. duct signal

152. The divergence factor D for (spherical earth) ground reflected wave is [16S02]a. < 1b. 2c. > 10d. 5

153. If the ground reflected wave is reflected from spherical earth, its energy is [16S03]a. more divergedb. less divergedc. unaffectedd. more converged

154. Curves that show the variation of modified index of refraction with height is knownas [16S04]

a. M curvesb. N curvesc. H curvesd. E curves

155. Standard propagation occurs when the modified index of refraction increases[16S05]

a. linearly with heightb. exponentially with heightc. linearly with distanced. uniformly with height

156. If the slope of M curve decreases near the surface of earth, _ _ _ _ _ _ _propagation results [16S06]

a. sub standardb. super standardc. standardd. non standard

157. If the slope of M curve increases near the surface of earth, _ _ _ _ _ _ propagationresults [16S07]

a. super standardb. sub standardc. standardd. non standard

158. Tropospheric forward scatter can provide reliable beyond the horizon signal fordistances upto [17D01]

a. 300 or 400 milesb.

100 or 200 milesc. 500 or 1000 miles

d. 10 to 50 miles


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159. If the lower side of the duct is at surface of earth, it is known as a [17M01]a. surface ductb. space ductc. sky ductd. tropospheric160. Elevated ducts found at elevations of [17M02]a. 1000 to 5000 ftb. 20 to 10,0 ftc. 500 to 1000 ftd. 8000 to 15000 ft

161. In folded dipole, two identical conductors in parallel serve as [17S01]a. transformerb. generatorc. loadd. source

162. When a reflector such as a copper screen is placed closed to a half wave antenna,the resultant radiation pattern is [17S02]

a. uni directionalb. conicalc. bi directionald. triangular

163. If the modified index decreases with height over a portion of the range of height,the rays will be curved downward and this condition known as [17S03]

a. duct propagationb. sky propagationc. space propagationd. tropospheric propagation

164. When the inverted portion of M curve is elevated above the surface of the earth, thelower side of the duct is also elevated, and the duct is called an [17S04]

a. elevated ductb. surface ductc. space ductd. sky duct

165. Elevated ducts are due to a subsidence of [17S05]a. large air massesb. ionospherec. troposphered. water vapor

166. Over land areas, surface ducts are produced by [17S06]a. radiation cooling of the earthb. water vaporc. heating of earthd. large air masses

167. Trapping more likely occurs at [17S07]a. UHFb. VHFc. VLFd. HF

168. Narrow band signals due to tropospheric forward scatter propagation have beenReceived up to [18D01]

a. 600 milesb. 700 milesc. 1000 milesd. 800 miles

169. Plasma frequency p is given by [18M01]a.b.c.d.


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170. Approximate value of collision frequency in Ionosphere is [18M02]a.b.c.d.171. During day time, F layer splits into [18S01]a.b. E & Dc. C & Dd. C & E

172. The electron density in Ionosphere will be [18S02]a. 104 electrons/ccb. 10 electrons /ccc. 102 electrons/ccd. 1000 electrons /cc

173. C region extends from [18S03]a. 50 - 70 kmb. 20 - 30 kmc. 40 - 50 kmd. 1 - 10 km

174. D region extends from [18S04]a. 70 - 90 kmb. 60 - 70 kmc. 40 - 60 kmd. 5 - 10 km

175. Other layers with in E region that do not have a permanent existence are called[18S05]

a. sporadic E layersb. sporadic F1 layersc. sporadic F2 layersd. sporadic D layers

176. _ _ _ _ _ _ _ represents the combined effects of collisions in all species of particlespresent. [18S06]

a. collision frequencyb. angular frequencyc. plasma frequencyd. spatial frequency

177. The variation in collision frequency V with height depends on [18S07]a. gas pressure, electron thermal velocity & ion densityb. gas pressure, collision frequencyc. gas pressure, electron thermal velocity & plasma frequencyd. gas pressure, electron thermal velocity & earth constant

178. The maximum ionization density ,N for any layer is [19D01]

a.

b.c.d.

179. Maximum usable frequency is [19M01]a.b.c.d.

180. For E layer, critical frequency, fE is [19M02]a.b.c.d.

181. The refractive index of Ionosphere, n is [19S01]


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a.b.c.d.182. Sudden ionospheric disturbance known as [19S02]a. dellinger effectb. meissner effectc. skin effectd. miller effect

183. Shown in Figure(a) represents

Figure(a)

[19S03]

a. Surface ductb. Elevated ductc. Sky ductd. Standard atmosphere

184. Dellinger effect produces [19S04]a. complete radio fade outb. partial radio fade outc. complete radio receptiond. improved radio signal reception

185. In ionospheric storms, the radio wave propagation becomes [19S05]a. very erraticb. very much reliablec. slightly degradedd. reliable

186. If the ionosphere is turbulent and loses its normal stratification, then this type ofirregularity is known as [19S06]

a. ionospheric stormb. sporadic ionospherec. non deviative ionospheric absorptiond. deviative ionospheric absorption

Shown in Figure(a)


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Figure(a)

[19S07]

e. standard atmospharef. surface ductg. elevated ducth. sky duct

187. The attenuation factor for ionosphereic propagation is [20D01]a.b.c.d.

188. real part of Effective permittivity of ionized gas is [20D02]a.b.c.d.

189. Debye length, D is [20M01]a.b.c.d.

190. Thomson scattering is incoherent at altitudes above [20M02]a. 100 km , for f > 200 MHzb. 200 km for f > 500 MHzc. 300 km for f > 100 KHzd. 400 km for f > 100 GHz

191. The irregularity of ionosphere occurring only in polar regions during a period ofsunspot maximum is known as [20S01]

a. polar cap absorptionb. non deviative polar absorptionc. deviative polar absorptiond. sporadic polar absorption

192. The absorption that occurs in D region is known as [20S02]a. non deviative absorptionb. deviative absorptionc. polar cap absorptiond. sporadic absorption

193. The absorption that occurs in the region when the wave is bent is called [20S03]a. deviative absorptionb. non deviative absorption


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c. polar cap absorptiond. sporadic absorption

194. Lowest useful high frequency (LUHF) depends on [20S04]a. effective radiated powerb. meissner effectc. earth constants onlyd. polar cap absorption

195. LUHF depends on [20S05]a. absorption characteristics of ionospher for paths between transmitter and receiverb. meissner effectc. earth constants onlyd. polar cap absorption

196. LUHF depends on [20S06]a. required field strength & radio noiseb. meissner effectc. earth constants onlyd. polar cap absorption

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