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Question Paper Code: A1431

VARDHAMAN COLLEGE OF ENGINEERING(AUTONOMOUS)

B. Tech VII Semester Online Objective Test November - 2014 (Regulations: VCE-R11)

CELLULAR AND MOBILE COMMUNICATIONS

(ELECTRONICS AND COMMUNICATION)

Date: ----, 2015 AN Time: 20 Min Max Marks: 5

UNIT-I

1. The following concept refers to the use of radio channels on the same carrier frequency to cover different areas that are separated from one another by sufficient distances.

(a) frequency reuse(b) handoff(c) cell splitting(d) cell geometry

Answer : (a)

2. The process of transferring an active call from one cell to another as the mobile unit moves from the first cell to the other cell without disconnecting the call.

(a) frequency reuse(b) handoff(c) cell splitting(d) cell geometry

Answer : (b)

3. The interference received from co-channel cells is called

(a) co-channel interference(b) frequency reuse(c) handoff(d) cell splitting

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Answer : (a)

4. The actual radio coverage of a cell is known as ———— and is determined from the field measurements

(a) Cluster(b) footprint(c) capacity(d) channel

Answer : (b)

5. The capacity of a cellular system is directly proportional to

(a) number of times a cluster is replicated in a fixed service area(b) number of cells in the cluster(c) Number of channels in the cell(d) none of the above

Answer : (a)

6. The systems were “cellular” because coverage areas were split into ———— each of which is served by a low power transmitter and receiver.

(a) cluster(b) capacity(c) channels(d) cells

Answer : (d)

7. Larger cells are more useful in ————.

(a) densely populated urban areas(b) rural areas(c) lightly populated urban areas(d) mountainous areas

Answer : (b)

8. Cellular system capacity can be increased by

(a) Frequency reuse(b) cell sectorization

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(c) both (a) and( b)(d) bandwidth increase

Answer : (c)

9. Total number of available radio channels can be expressed for frequency reuse of a cluster size of “N” with each cell allocated a group of “k” channels

(a) 2k × N channels(b) 2k/N channels(c) k/N channels(d) k × N channels

Answer : (d)

10. The following cell layout is the most economically efficient as it requires least number of cells to cover a given area

(a) triangular(b) circular(c) rectangular(d) hexagonal

Answer : (d)

11. Smaller cells in the cellular system have greater system capacity and the co-channel interference

(a) increases(b) decreases(c) constant(d) none of the above

Answer : (a)

12. By dividing the cell geographically, usually into 120° sectors, its coverage area and the overall quality of the system

(a) improves(b) degrades(c) no change(d) none of the above

Answer : (a)

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13. In cellular design, the D/R ratio is used to characterize the

(a) cell splitting(b) frequency reuse(c) cell sector(d) sectorized antenna

Answer : (b)

14. Reuse pattern needed for a C/I of 18 dB is

(a) 7-cell(b) 4-cell(c) 12-cell(d) 2-cell

Answer : (a)

15. The cellular network seen as a superposition of the smaller cell pattern on top of the complete larger cell pattern is

(a) underlaid-cell concept(b) overlaid-cell concept(c) small cell superposition(d) none of the above

Answer : (b)

16. It is possible to reduce the power in transmitted signals if the cell radius is

(a) increased(b) kept constant(c) made zero(d) reduced

Answer : (d)

17. The concept of repeating the same frequency is known as

(a) cell splitting(b) frequency reuse(c) co-channel interference(d) none of the above

Answer : (b)

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18. Which of the following design and concept sets cellular communications apart from all the preceding mobile radio systems?

(a) TDMA(b) frequency reuse(c) half-duplex(d) none of the above

Answer : (b)

19. The cellular technical construct that requires the geographic distance that is required between the cells using identical frequencies to avoid interference between the radio transmission at these cells is

(a) D/R ratio(b) call handoff(c) cell splitting(d) none of the above

Answer : (a)

20. The higher the frequency of a radio signal, the greater is the

(a) absorption rate(b) free space(c) co-channel interference(d) none of the above

Answer : (a)

21. The wireless medium [ ]

(a) is quite reliable for voice and data communication (b) is not quite reliable for voice and data communication (c) offers very large bandwidth (d) does not support mobility Answer: b

22. It is difficult to achieve accurate timing, synchronization and phase recovery at the mobile receiver. It is attributed mainly to the effect of

[ ](a) Doppler spread of the received signal (b) multipath propagation reception

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(c) scattering of the transmitted signal (d) non line-of-sight propagation Answer: a

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23. The propagation path loss [ ](a) increases with frequency of transmission but decreases with the distance (b) decreases with frequency of transmission as well as the distance (c) increases with frequency of transmission as well as the distance (d) is always constant, independent of frequency of transmission and distance Answer: c

24. The difference in free-space propagation path loss between two locations at 2 Km and 8 Km from the transmitter is [

]

(a) 6 dB (b) 12 dB

(c)20 dB(d) 40 dB Answer: b

25.In mobile radio propagation environment, typical value of path loss exponent, γ is[ ]

(a) 2 (b) 3 (c) 4 (d) 5 Answer: c

26. ________________ occurs when the radio path between transmitter and receiver is obstructed by surface with sharp irregular edges.

[ ]

(a) Scattering (b) Refraction (c) Reflection (d) Diffraction Answer: d

27. Two main reasons that contribute to the rapid fluctuations of the signal amplitude in mobile communications are [ ] (a) Multipath fading and Doppler effect (b) Reflection and Refraction

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(c) Diffraction and Scattering (d) Blocking and Shadowing Answer: a28.A regular _____________ shaped cell is the closest approximation to a circle out which has

been used for cellular system design.[ ]

(a) circular (b) (b) triangular (c) square (d) hexagonal

Answer: d29. The propagation considerations recommend the ________ as a cell shape for defining the area

covered by a particular cell site. [ ]

(a) circular (b) triangular(c) square(d) hexagonalAnswer: a

30. A __________ can be repeated any number of times in a systematic manner in order to

cover the designated large geographical service area.

[ ]

(a) channel (b) cell (c) cell-site (d) cluster Answer: d31. ____________________ is the major concern in frequency reuse. [ ]

(a)System noise (b) Co-channel interference (c) Adjacent-channel interference (d) Intermodulation Answer: b

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32.A mobile communication system has allocated number of 1000 voice channels. If the

service area is divided into 20 cells with a frequency reuse factor of 4, the system

capacity is

[ ]

(a) 1000 (b) 4000 (c) 5000 (d) 20000 Answer:c

33. A mobile communication system is designed with a cluster size of 7. If the area of a cell is 5 km2, the area of the cluster is [

]

(a) 5 km2

(b) 25 km2

(c) 35 km2

(d) 49 km2

Answer: c34.A cellular network is reconfigured with frequency reuse pattern of 7 instead of 4. The

increase in overall system capacity is approximately [

]

(a) 1.7 times(b) 4 times (c) 7 times (d) 28 times Answer: a

35.A service area is covered with 10 clusters having 7 cells in each cluster and 16 channels assigned in each cell. The number of channels per cluster are [

](a) 16 (b) 70 (c) 112 (d) 1120 Answer: c

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36. If there are J number of channels per cell and K number of cells per cluster, then the total number of channels available in a cluster is equal to [

](a) J / K (b) J x K (c) K / J (d) J x K2

Answer: b

37. In a regular hexagonal geometry pattern, the number of cells in a cluster formed by i = 2

and j = 2 are [ ]

(a) 4 (b) 7(c) 9(d) 12 Answer: d

38. For a given frequency reuse ratio of 8 and the cell radius of 0.8 km, the distance

between nearest cochannel cells is [

]

(a) 6.4 km (b) 0.8 km(c) 0.1 km (d) 8.8 km Answer: a

39.The distance between the centers of two adjacent hexagonal cells, each cell

having radius of 2 km, is [ ]

(a) 2 √3(b) √3(c) 3 √3(d) √3 / 2

Answer: a

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40 .For a given frequency reuse ratio of 3, the cluster size is [ ]

(a) 3 (b) 4 (c) 7 (d) 12

Answer: a

UNIT_II

61. The minimum separation between a transmitting antenna and a receiving antenna is

necessary to avoid ___________________ problem. [ ]

(a) cochannel interference (b) receiver desensitization (c) intermodulation (d) (b) and (c) both Answer: d62.For a cluster size of 7, the frequencyreuse ratio isapproximately equal to [ ]

(a) 3 (b) 7 (c) √21 (d) 21 Answer: a63. For a cluster size of 7, the carrier-to-interference ratio, C/Iisapproximately [ ]

(a) 73.5 (b) 147 (c) 1.5 (d) 7 Answer: a64. In an omnidirectional cellular system, the value of cluster size of ___ would be a correct

choice to meet C/I requirement of at least 18 dB in worst-case scenario. [ ]

(a) 3 (b) 4 (c) 7 (d) 9 Answer: d

65. Separation between two transmitting antennas at the same cell-site should be minimized to

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avoid _________________ . [ ] (a) cochannel interference (b) adjacent channel interference (c) intermodulation (d) receiver desensitization Answer: c66. The minimum separation between a transmitting antenna and a receiving antenna at the

cell-

site must be ensured in order to avoid __________________. [ ]

(a) cochannel interference (b) adjacent channel interference (c) intermodulation (d) receiver desensitization Answer: d67.________________ can reduce the interference to the neighbouring cells and enhance the

weak spots in the cell coverage.[ ]

(a) Antenna tilting (b) 60 degree sectorized cells (c) 120 degree sectorized cells (d) reorienting the directional antenna patterns Answer: a

68. Assuming each cell site transmits the same power, then as the value of cluster size

K is increased, the co channel interference will [ ]

(a) remain same. (b) (b) increase marginally. (c) increase drastically. (d) (d) decrease.

Answer: d69. The results in co-channel interference measurement test at the mobile unit show that C/I is

less than 18 dB and carrier-to-noise ratio C/N is greater than 18 dB in some areas. The

cellular system is said to [ ]

(a) be properly designed. (b) have co-channel interference problem. (c) have radio coverage problem.

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(d) have co-channel interference as well as radio coverage problem. Answer: b70. Cells using the same set of frequencies are called [ ]

(a) neighbouring cells.(b) adjacent channel cells. (c) co-channel cells. (d) clusters.

Answer: c

71.As the separation between two cochannel cells increases, interfering signal power from

cochannel interfering cell [ ]

(a) increases marginally. (b) increases significantly. (c) decreases significantly. (d) remains same.

Answer: c

72. The use of directional antennas at the cell-site will result into [ ](a) reduction in cochannel interference and increase in system capacity. (b) reduction in cochannel interference as well as system capacity. (c) increase in cochannel interference as well as system capacity. (d) increase in cochannel interference and increase in system capacity. Answer:a

73.There is a _______ dB per decade attenuation in signal strength as a function of distance in

free space propagation.

(b) 6 (c) 12 (d) 20 (e) 40Answer : c

74. In permanent splitting the number of channels, transmitted frequencies are ______[](a)Number of channels fixed

(b)Frequencies varied

(c) Both are varied

(d) Both fixed

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Answer: d

75. Troposphere reflection occurs due to abrupt changes in ________________[ ]

(a) Moisture

(b)Dielectric constant

(c) path length

(d) angle

Answer: b

76. The voice quality depends on ___________criteria. [ ]

(a)performance

(b) circuit merit

(c) a& b

(d) communication

Answer: b

77. When the directional antennas are used the number of interferers is reduced from_____

[ ]

(a) 2 to 6

(b) 4 to 2

(c) 6 to 2

(d) 2 to 4

Answer: c

78. The reduce of interference to neighboring cells and enhancing the weak spots in the cell is done by _________________ [ ]

(a) Antenna pattern(b) Antenna tilting

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(c) Antenna gain(d) NoneAnswer: b

79. The frequency reuse concept can be used in [ ]

(a) Time domain

(b) Space domain

(c) both a & b

(d) None

Answer: c

80.Which of the following method is NOT USED to reduce the co-channel interference in a cellular mobile system

(a) Increasing TheSeperation Between The Two Cells

(b) Using Directional Antennas At The Base Station

(c) Lower The Antenna Heights At The Base Station

(d) Reducing The Channel Capacity

Answer:d

81.Anything which alters, modifies, or disrupts a signal as it travels along a channel between a source and a receiver is called as

(a) noise(b) interference(c) crosstalk(d) deterioration in receiver

Answer : b

82.For hexagonal cellular systems, the interference that results from the first tier is

(a) next-channel interference(b) near-end to far-end interference(c) co-channel interference(d) adjacent-channel interference

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Answer : c

83.Co-channel interference can be reduced by

(a) decreasing D/R(b) increasing co-channel interference ratio, q(c) reducing number of channels(d) increasing cluster size (N)

Answer : b

84.Adjacent-channel interference is caused by signals from

(a) same frequencies(b) same cell site(c) neighbouring frequencies(d) neighbouring cell site

Answer : c

85.Adjacent-channel interference is reduced if the separation between adjacent channels in a cell is

(a) maximum(b) minimum(c) unaltered(d) doubled

Answer : a

86.Co-channel interference limits the extent to which

(a) cluster size can be reduced(b) transmit power can be used(c) co-channel interference ratio can be increased(d) number of channels that can be used in a cell site

Answer : a

87.Interference caused by the channels that are several channels away from the desired channel is known as

(a) next-channel interference(b) transmitting and receiving channel interference

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(c) neighbouring-channel interference(d) intra-channel interference

Answer : c

88.Which of the following method is not used to reduce the co-channel interference in a cellular mobile system ?

(a) increasing the separation between the two channels cells(b) using directional antenna at the base station(c) lower the antenna heights at the base station(d) reduce the channel capacity

Answer : d

89.The TV wave will not be distorted by cellular wave because

(a) both the waves are horizontally polarized(b) both the waves are vertically polarized(c) first one is horizontally and later is vertically polarized(d) first one is vertically and later is horizontally polarized

Answer : c

90.The angle of wave arrival at the mobile unit is mailny due to

(a) zero angle(b) incident angle(c) ground elevation angle(d) reflected angle

Answer : c

91.The value of of co-channel reduction for normal interference case in & cell pattern

(a) q=1.6(b) q=3.2(c) q=4.6(d) q=3.2

Answer:c

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92.The type of the pattern of the antenna is used to reduce both the co-channel and long distance interference

(a) directional pattern (b) omni directional pattern(c) umbrella pattern(d) none

Answer:c

93.The frequency re-use concept can be based in

(a)(b)(c)(d)

Answer:

94.Antenna pattern, Antenna gain, Antenna tilting, Antenna height all affect the cellular system design

(a) Antenna gain,antenna tilting

(b) Antenna pattern

(c) Antenna height

(d) all the above

Answer:d

95.Interference due to the common use of the same channel is called _________ and this is main problem for frequency reuse

(a) Adjacent channel interference(b) co-channel interference(c) next channel interference(d) neighbour channel interference

Answer:b

96.If C/I is less than 18dB and C/N is greater than 18dB in some area there is_____

(a) co-channel interference problem (a) coverage problem (b) adjacent channel interference problem

[Type text]

(c) none

Answer:a

97.The frequency re-use distance D can be determined

(a) D = (sqrt 3K) . R(b) D = (sqrt 3K/R)(c) D = (sqrt 3R/K) (d) None

Answer:a

98.The _______ scheme applied at the receiving end of the antenna is an effective technique for reducing interference

(a) cell splitting(b) cell sectoring (c) diversity(d) none

Answer:c

99.By using the following we can avoid in increasing the number K in a seven cell frequency pattern

(a) high transmitter power(b) efficient frequency channel assignment(c) directional antenna arrangement(d) increasing number of channels

Answer:c

100.co-channel interference is a function of a defined as

(a) q=D/√R(b) q=R.D(c) q= R/D(d) q= D/R

Answer:d

101.The following antenna parameter reduce the interference to the neighboring cells

[Type text]

(a) omni directional(b) tilting (c) diverting(d) none

Answer:b

102.If C/I ration is greater than 18dB through out most the cell,the system is said to be

(a) not properly designed(b) properly designed(c) there exits some interference problems(d) none

Answer:b

103. Why cell splitting concept is used in a cellular system concept

(a) reduce coverage problem (b) reduce interference(c) improve the utilization and spectrum efficiency(d) none

Answer:c

104. If both C/I and C/N are less than 18 dB and C/I=C/N in a given area,then

(a) there is co channel interference & there is coverage problem(b) there is co channel interference(c) there is coverage problem(d) none

Answerc:

105. If both C/I & C/N are less than 18 dB and C/N>C/I in a given area then there is

(a) coverage problem and co-channel interference(b) coverage problem(c) co-channel interference(d) none

Answer: a

106.To decrease the blocking probability requires a

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(a) bandwidth(b) interference(c) sufficient number of radio channels(d) spectrum

Answer: d

107.with the radio coverage it is not possible 100% of the area because

(a) interference (b) coverage(c) bandwidth(d) irrelgular terrain

Answer: d

108.which of the following appropriate voice channel for a call

(a) base station(b) MTSO(c) Cell site(d) radio channels

Answer: b

109.If both C/I and C/N are less than 18 dB and C/I=C/N in a given area,then

(a) there is co channel interference & there is coverage problem(b) there is co channel interference(c) there is coverage problem(d) none

Answer: c

110.Call termination is obtained by sending the signal tone from

(a) mobile unit to cell site (b) cell site to mobile unit(c) cell site to cell site(d) none

Answer: a

111.If traffic increases, a noise limited cellular system becomes ___________.

[Type text]

(a) an interference limited system(b) balanced system(c) noise less system(d) protected system

Answer: a

112.The thermal noise level kTB with a bandwidth of 30 KHz and a temperature of 17oC is ____dBm.

(a) -129(b) +129(c) -100(d) +100

Answer: a

113.In a cellular radio equipment, an input of -116 dBm is equivalent to a SINAD of __dB

(a) 0(b) 3(c) 10(d) 12

Answer: d

114.The type of mobile antenna normally used is __________.

(a) PIFA(b) dipole(c) horn(d) yagi-uda

Answer: a

115.Co-channel interference which occurs in one channel will occur __________ in all the other channels in a given area.

(a) less(b) more(c) equally(d) none

Answer: c

[Type text]

116.In UHF TV interference the ________order IM product is very important.

(a) first(b) second(c) third(d) fourth

Answer: c

117.Why cell splitting concept is used in a cellular mobile system?

(a) to improve the co-channel interference reduction(b) ease of handoff procedure(c) efficient use of transmitter power(d) to improve the utilization of spectral efficiency

Answer: d

118.Frequency reuse in time domain results in the occupation of the same frequency in different time slots is called as_________.

(a) FDM(b) TDM(c) CDM(d) WDM

Answer: b

119.During Q calls in an hour , if a call is dropped and (Q-1) calls are completed , then the call drop rate is _________.

(a) Q(b) 1/Q(c) Q2

(d) 1/Q2

Answer: b

120.The type of the pattern of antenna is used to reduce both co-channel and long distance interference is _______.

(a) Umbrella pattern(b) Omni directional pattern(c) isotropic pattern(d) none

[Type text]

Answer: a

UNIT-III

121.A ____________ antenna is defined as a hypothetical loss-less antenna having equal radiation in all directions. [ ]

(a) monopole(b) quarter-wave dipole (c) half-wave dipole (d) isotropic

Answer: (d)122. A ______________ antenna is one which has the property of radiating or receiving electromagnetic waves more effectively in some directions than in others.

[ ](e) omnidirectional (f) directional (g) isotropic (h) smart

Answer: (b)

123.The effective radiated power (ERP) is greater than the effective isotropic radiated power

(EIRP) by _______ approximately. [ ]

(a) 1 dB (b) 2 dB (c) 3 dB (d) 6 dB

Answer: (b)124. The relationship between antenna gain, Gr and effective area or aperture, Aeff of a

[Type text]

receiving antenna in a given direction is ]

(a) Gr = (4π Aeff ) / λc2

(b) Gr = 4π Aeff λc2

(c) Gr = (4π λc2 ) / Aeff

(d) Gr = (4π ) / (λc2Aeff )

Answer: (a)

125. The radiation resistance of a half-wave dipole antenna situated in free-space and fed at the center is approximately [

](a) 50 Ω. (b) 70 Ω. (c) 300 Ω. (d) 1 MΩ.

Answer: (b)126. Wireless communication systems usually use ______________ polarization because this is

more convenient for use with portable and mobile antennas. [ ]

(a) horizontal (b) vertical (c) hybrid (d) none of the above

Answer: (b)

127 Cellular base-station receiving antennas are usually mounted in such a way so as to obtain __________ diversity. [ ](e) frequency (f) polarization (g) space (h) horizontal Answer: (c)

128. The minimum separation between a transmitting antenna and a receiving antenna is

necessary to avoid ___________________ problem. [ ]

(a) cochannel interference

[Type text]

(b) receiver desensitization(c) intermodulation (d) (b) and (c) both Answer: (d)

129. If the radius of a cell is 12 kms, the cell-site antenna can be located within a

_________ radius. [ ](a) 0.5 km (b) 1 km (c) 2 km (d) 3 km Answer: (d)

130.In a mobile radio environment, the frequency reuse ratio, q and the carrier-to-interference

ratio, C/I are related with the following expression. [ ]

(a) q =6×C1 4

(b) q =6×C4

(c) q=1×C14 6 I(d) q =1×C46 IAnswer: (a)

131. For a cluster size of 7, the frequencyreuse ratio isapproximately equal to[ ]

(a) 3 (b) 7 (c) √21 (d) 21 Answer: (c)

132. For a cluster size of 7, the carrier-to-interference ratio, C/Iisapproximately

[ ](a) 73.5 (b) 147

[Type text]

(c) 1.5 (d) 7 Answer: (a)

133In an omnidirectional cellular system, the value of cluster size of ___ would be a correct

choice to meet C/I requirement of at least 18 dB in worst-case scenario.

[ ]

(a) 3 (b) 4 (c) 7 (d) 9

Answer: (d)

134Separation between two transmitting antennas at the same cell-site should be minimized to

avoid _________________ . [ ]

(a) cochannel interference (b) adjacent channel interference (c) intermodulation (d) receiver desensitization

Answer: (c)

135. The minimum separation between a transmitting antenna and a receiving antenna at

the cell-site must be ensured in order to avoid __________________. ]

(a) cochannel interference (b) adjacent channel interference (c) intermodulation (d) receiver desensitization

[Type text]

Answer: (d)136 ________________ can reduce the interference to the neighbouring cells and enhance

the weak spots in the cell coverage. [ ]

(a) Antenna tilting (b) 60 degree sectorized cells (c) 120 degree sectorized cells(d) reorienting the directional antenna patterns

Answer: (a)

137 Diversity scheme is applied at the_---------- end of the antenna. [ ]

(a) receiving (b) transmitting (c) MTSO (d) AllAnswer : a

138. Antenna pattern, antenna gain, antenna tilting, and antenna height all effect the cellular system design [ ]

(a) Antenna pattern(b) antenna gain, antenna tilting(c) antenna height(d) all the above

Answer : d

139. Cell coverage and traffic are mainly affected by [ ] (a) Human made structures (b) Natural terrain (c) Hill terrain (d) All tha aboveAnswer : d140. In area-to-area model what is the standard deviation of actual values with the predicted

value. [ ]

[Type text]

(a) 10 dB (b) 8 dB (c) 15dB (d) 25 dBAnswer : b

141.Mobile antennas are ——— dependent.

(a) frequency(b) power(c) height(d) all of the above

Answer : (a)

142.Polarization can be defined as

(a) direction of oscillation of the magnetic field vector(b) direction of oscillation of the electrical field vector(c) direction of oscillation of the both EM(d) none of the above

Answer : (b)

143.Standard value of VSWR in mobile communication is

(a) 1(b) 0(c) 1.5(d) 2

Answer : (c)

144.If a mobile antenna has again more than 3 dB what will be its receiving capacity?

(a) receives only limited portion of total multipath signals(b) receives only portion of total multipath signals(c) cannot receive at all

[Type text]

(d) receive large signal with noise

Answer : (a)

145.Compare the position of glass mounted antenna with roof mounted antenna.

(a) it should be lower than roof mounted antenna(b) it should be larger than roof mounted antenna(c) they are equal positions(d) cannot be compared

Answer : (a)

146.Comment an antenna beam pattern of directional antenna.

(a) suppressed horizontally(b) suppressed vertically(c) elevated vertically(d) elevated horizontally

Answer : (a)

147.Comment an antenna beam pattern of high gain antenna.

(a) suppressed horizontally(b) suppressed vertically(c) elevated vertically(d) elevated horizontally

Answer : (b)

148.The motor vehicle mounted antenna is the following antenna

(a) directional antenna(b) omni-directional antenna(c) smart antenna(d) microstrip antenna

Answer : (b)

149.What will be the radiation pattern of roof mounted antenna?

(a) uniformly distributed(b) not uniformly distributed

[Type text]

(c) (a) or (b)(d) cannot be predicted

Answer : (a)

150.Several vertically stacked umbrella pattern can form a

(a) abnormal antenna(b) high gain antenna(c) interference reduction antenna(d) mobile antenna

Answer : (b)

151. In space diversity antennas, if h is the height of antenna and d is separation distance, then efficiency η is

(a) η = h2/d(b) η = h/d(c) η = h/d2

(d) η = (h/d)2

Answer : (a)

152. Several vertically stacked umbrella pattern can form a(n)

(a) abnormal antenna(b) high-gain antenna(c) interference reduction antenna(d) mobile antenna

Answer : (b)

153. Minimum separation of cell-site receiving antennas will have one of the following advantage

(a) can avoid intermodulation(b) reduces ISI(c) Reduces noise(d) controls distortion

Answer : (a)

154. The two-branch space diversity antennas can ——— in mobile communication

[Type text]

(a) reduce fading(b) increase fading(c) reduce gain(d) increase ISI

Answer : (a)

155. The gain of glass-mounted antennas will be

(a) 1–10 dB(b) 3 dB(c) 4 dB(d) 7 dB

Answer : (b)

156. Separation between two transmitting antennas at the same cell site should be minimized to avoid

(a) co-channel interference(b) adjacent channel interference(c) intermodulation(d) receiver desensitization

Answer : (c)

157. In abnormal antenna configuration, an omni cell-site is equipped with 45 channels, for which ………….. transmitting antennas are used.

(a) 13(b) 5(c) 3(d) 9

Answer : (c)

158. One transmitting antenna for two receiving antennas is applied in directional antenna arrangement. Then the type of cell sectoring is a …….

(a) 60° sector(b) 120° sector(c) 30° sector(d) 90° sector

[Type text]

Answer : (b)

159. Cellular base-station receiving antennas are usually mounted in such a way so as to obtain ——— diversity.

(a) frequency(b) polarization(c) space(d) horizontal

Answer : (c)

160. The radiation resistance of a half-wave dipole antenna situated in free space and fed at the centre is approximately

(a) 50 Ω(b) 70 Ω(c) 300 Ω(d) 1 M Ω

Answer : (b)

161. Foliage areas are

(a) natural terrains(b) man-made structures(c) open areas(d) urban areas

Answer : (a)

162. In a standard local mean spread, in the curve of signal strength versus distance from transmitting antenna, the measured standard deviation would be

(a) 18 dB(b) 5 dB(c) 8 dB(d) 0.8 dB

Answer : (c)

163. Foliage loss is due to

[Type text]

(a) tall buildings(b) indoor structures(c) tall trees, leaves, etc.(d) outdoor structures

Answer : (c)

164. A cell site located at a height covers a signal in

(a) smaller area(b) larger area(c) short-distance propagation(d) long-distance propagation

Answer : (b)

165. The gradual bending of rays due to changing effective dielectric constant of atmosphere is the following effect

(a) troposphere reflection(b) troposphere refraction(c) moistness(d) diffraction

Answer : (b)

166. Signal coverage can be found by ——— and generally applied to ———

(a) coverage prediction models, end system(b) coverage prediction models, start up system(c) point-to-point, end system(d) point-to-point model, terrain contour

Answer : (b)

167. The path that is not obstructed by terrain profile and man-made structure is

(a) non-obstructive path(b) indirect path(c) line-of-sight path(d) none

Answer : (c)

[Type text]

168. Consider the following statements and mention whether it is true or false:

i. In man-made structures, there are sparse structuresii. In man-made structures, there are dense man-made structures

(a) first statement is true(b) second statement is true(c) both are true(d) both are false

Answer : (c)

169. In mobile-to mobile-propagation, the propagation channel acts as

(a) repeater(b) attenuator(c) filter(d) amplifier

Answer : (c)

170. ________ losses occur due to trees.

(a) hills(b) foilage(c) water(d) none

Answer : (b)

171.Cell coverage and traffic are mainly affected by ______.

(a) human made structures(b) natural terrains(c) hill terrains(d) all the above

Answer : (d)

172. What is the radiation pattern of the antenna used for cell system?

(a) dow-nut shape

[Type text]

(b) dumbel shape(c) umbrella pattern(d) circular pattern

Answer : (c)

173. Area-to-Area prediction model can be represented by _______ parameters.

(a) dow-nut shape(b) dumbel shape(c) umbrella pattern(d) circular pattern

Answer : (c)

174. _________ model , which would provide a standard deviation from the predicted value of less than 3 dB.

(a) point-to-point(b) area-to-area(c) flat open area(d) rough area

Answer : (a)

175. In _____ model, all the areas are considered flat even though the data may be obtained from non-flat areas.

(a) point-to-point(b) area-to-area(c) flat open area(d) rough area

Answer : (b)

176. Lowering the antenna height on hill ________ the received power at either cell site or mobile unit.

(a) reduces(b) increases(c) no changes

[Type text]

(d) None

Answer : (a)

177. To reduce co-channel interference to the neighboring cells and enhancing the weak spots in the cell is done by _________.

(a) antenna pattern(b) antenna tilting(c) antenna gain(d) All the above

Answer : (b)178. The diversity scheme is applied at the _____end of the antenna.

(e) receiving(f) transmitting(g) MTSO(h) All the above

Answer : (a)

179. If the foliage is non uniform, then the path length is ____________.

(a) receiving(b) transmitting(c) MTSO(d) All the above

Answer : (a)180. The model used to understand the path loss phenomenon in a mobile radio environment is ___________.

(a) one -wave model(b) two -wave model(c) zero model(d) constant model

Answer : (b)

UNIT-IV

[Type text]

181.In the 800 MHz band cellular system the duplex separation is specified as[ ]

(a) 20 MHz. (b) 25 MHz. (c) 45 MHz. (d) 80 MHz.Answer : c

182.The original standard non-extended spectrum in US-AMPS analog cellular system has

_____________ allocated bandwidth on either side of duplex spectrum.

[ ] (a) 10 MHz

(b) 20 MHz (c) 25 MHz(d) 30 MHz

Answer :b

183.The channel spacing in standard US-AMPS analog cellular system is [ ]

(a) 10 KHz (b) 25 KHz (c) 30 KHz (d) 200 KHz

Answer : c

184. In extended spectrum US-AMPS cellular standard, the uplink frequency band (Mobile Tx) is specified as [

]

(a) 824 MHz – 849 MHz (b) 825 MHz – 845 MH (c) 869 MHz – 894 MHz (d) 870 MHz – 890 MHz

Answer : b

185. The total number of channels available in extended spectrum US-AMPS cellular

standard are [ ]

[Type text]

(a) 312 (b) 416 (c) 666 (d) 832

Answer : d

186. There are total 84 voice channels available in a cellular system configured with a 7-cell

omnidirectional cluster pattern. Assuming the uniform distribution of channels, the

number of voice channels in a cell is [ ]

(a) 7 (b) 12 (c) 84 (d) 588.

Answer : b

187. There are total 168 voice channels available in a cellular system configured with a 7-cell,

3-sector cluster pattern. Assuming the uniform distribution of channels in each sector,

the number of voice channels in a sector is [

]

(a) 3 (b) 7 (c) 8 (d) 12

Answer : c

188. There are total 120 voice channels available in a cellular system configured with a 4-cell,

6-sector cluster pattern. Assuming the uniform distribution of channels in each sector,

the number of voice channels in a sector is [

]

(a) 5 (b) 20(c) 30(d) 120

[Type text]

Answer : a

189. In the GSM cellular system, a pair of 25 MHz band is allocated to the uplink and downlink

channel to provide full duplex transmission. Each radio carrier uses 200 KHz bandwidth.

If the cluster size is four, the number of channels in each cell is

[ ]

(a) 4(b) 8(c) 31(d) 124

Answer : c

190. The __________________ scheme is used primarily for slow-growing systems on a long-

term basis as an alternate to costly cell splitting. [

]

(a) channel sharing (b) channel-borrowing (c) dynamic channel assignment (d) overlapped cells-based channel assignment

Answer : b

191. The solution to minimize interference in channel borrowing scheme is the use of

____________________. [ ]

(a) omnidirectional cells (b) 3-sector cells (c) 6-sector cells (d) Either (b) or (c)

Answer : d

192. In order to verify potential interference and possible prohibition of borrowed

channels from other cells, the system designer must check [

]

[Type text]

(a) the reuse distance with other nearby clusters.

(b) the directions of sectors of all cells not satisfying the reuse distance.

(c) Either (a) or (b).

(d) Both (a) and (b).

Answer : d

193. Cell sectorization serves the same purpose as the _________________ scheme.

[ ]

(a) channel-sharing (b) channel-borrowing (c) cell-splitting (d) hybrid-channel assignment

Answer :b

194. The distributed dynamic channel assignment schemes is primarily based on[ ]

(a) frequency reuse distance(b) C/I ratio. (c) signal-to-noise ratio(d) Either (a) or (b) or (c). Answer : d

195. The optimal ratio between the number of fixed and dynamic channels in hybrid

channel assignment mainly depends on [

]

(a) traffic characteristics (b) availability of channels (c) blocking probability (d) system overheads Answer :a

196. The following type of message is used is used for paging. [ ](a) control filler message (b) direct call retry

[Type text]

(c) mobile station control message (d) system parameters overhead messageAnswer :c

197.The setup channels are also called [ ](a) control channels (b) assigned channels (c) call waiting channels(d) forward call channelsAnswer :a

198.Handoffis implemented on ---------------------- channel [ ](a) control (b) assigned(c) data(d) voice channel Answer :d

199.Channel sharing is a---------------traffic relief scheme. [ ](a) short term (b) long term (c) both a & b (d) noneAnswer: a

200. The -----------algorithm is based on assigning a channel dynamically but

obeying the rule of reuse distance [ ](a)FBCA(b) HCA (c)DCA(d) FCAAnswer : a

201.The main function of the frequency management is

(a) increasing gain(b) increasing power(c) dividing total number of channels into subsets(d) adding the given number of channels

Answer :c

202.Numbering the channel is done by the following

(e) RVC(f) RCC(g) FVC

[Type text]

(h) FCC

Answer :d

203.What basis in a fixed channel set that consists of one or more subsets is assigned to a cell site?

(i) short-term basis(j) in dynamic basis(k) long-term basis(l) temporary basis

Answer :c

204.What is the method of channel assignment to a mobile unit during call in progress?

(a) short-term basis(b) in dynamic basis(c) long-term basis(d) temporary basis

Answer: a

205.Allocation of specific channels to a cell site is known as

(a) frequency management(b) frequency allotment(c) channel assignment(d) channel modeling

Answer :c

206.What is the other name of set-up channels?

(e) reverse channels(f) forward channels(g) control channels(h) traffic channel

Answer :c

207.In normal handoff procedure the handoff request is based on ———

[Type text]

(a) power level(b) signal strength(c) peak current(d) time delay

Answer : b

208.Generally, the soft handoff procedure involves ——— number of cell-site(s).

(a) 1(b) 3(c) 6(d) Several

Answer : d

209.In———, a call communication link uses only one channel at any moment.

(a) softer handoff(b) soft handoff(c) hard handoff(d) intra-cell handoff

Answer : c

210.Creating handoff is requested by ———

(a) PSTN(b) MTSO(c) BSC(d) -cell site

Answer : b

211.The radio capacity for the lower voice quality ———

(a) remains unaffected(b) decreases(c) approaches to zero(d) increases

Answer : d

212.The decentralized handoff protocol that distributes the handoff decision process.

[Type text]

(a) Network-controlled handoff(b) Mobile-assisted handoff(c) Soft handoff(d) Mobile-controlled handoff

Answer : b

213.The cellular networks that uses the NCHO protocol is ———

(a) GSM(b) ETACS(c) USDC(d) AMPS

Answer : d

214.The overall handoff delay in mobile-assisted handoff algorithm is typically ———

(a) 5–10 s(b) 1 s(c) 2–3 s(d) less than 1 s

Answer : b

215.The relation between channel capacity and bandwidth of the system is ———

(a) directly proportional(b) inversely proportional(c) both a & b(d) none

Answer : a

216.One of the main probable reasons of call drop is ———

(a) co-channel interference(b) handoff(c) external noise(d) channel assignment

Answer : b

[Type text]

217.In set-up channels every two-way channel contains a ——— bandwidth.(a)10 KHz (b) 25 KHz (c) 30 KHz (d) 200 KHz

Answer : b

218.In normal case, ——— set-up channels can be used for paging and accessing.

(e) three(f) one(g) two (h) four

Answer : b

219.All the set-up channels carry only ———.

(a) Data information(b) Voice call(c) noise(d) None

Answer : a

220.The access channel can be designated by ——— as a channel apart from set-up channels in the cell site

(a) PSTN(b) MTSO(c) BSC(d) -cell site

Answer : b

221.Channel barrowing strategy is and approach in which channel assignment

(a) Fixed channel assignment(b) Dynamic channel assignment

[Type text]

(c) Hybrid channel assignment(d) none

Answer : a

222.A full duplex wireless cellular system is allocated a total spectrum of 20MHz each has 25MHz RF .Bandwidth. determine total no of duplex channels.

(a) 100(b) 500(c) 400(d) 200

Answer : c

223.A full duplex wireless cellular system is allocated a total spectrum of 20MHz each has 25MHz RF Bandwidth. determine number of channels per cell-site if K=4 cell reuse patter is employed.

(a) 100(b) 500(c) 400(d) 200

Answer : a

224. In downlink signal transmission takes place from the(a) Cell site(Transmitter)-mobile subscriber(Receiver)(b) Mobile subscriber(Receiver)-Cell site(Transmitter)(c) Cell site(Transmitter)-Cell site(Transmitter)(d) Mobile subscriber(Receiver)-Mobile subscriber(Receiver)

Answer: a

225. In uplink signal transmission takes place from the(a) Cell site(Transmitter)-mobile subscriber(Receiver)(b) Mobile subscriber(Transmitter)-Cell site(Receiver)(c) Cell site(Transmitter)-Cell site(Transmitter)(d) Mobile subscriber(Receiver)-Mobile subscriber(Receiver)

Answer: b

[Type text]

226. Uplink is also referred as(a) Forward channel link(b) Reverse channel link(c) Set-up channel link(d) Control channel link

Answer : b

227. downlink is also referred as(a) Forward channel link(b) Reverse channel link(c) Set-up channel link(d) Control channel link

Answer : a

228. Channel 1 frequency at mobile transmit is (a) 825.030 MHz (b) 870.030MHz(c) 844.980MHz(d) 889.980MHz

Answer : a

229. Channel 1 frequency at cell transmit is (a) 825.030 MHz (b) 870.030MHz(c) 844.980MHz(d) 889.980MHz

Answer : b

230. Channel 666 frequency at mobile transmit is (a) 825.030 MHz (b) 870.030MHz(c) 844.980MHz(d) 889.980MHz

Answer : c

[Type text]

231. Channel 666 frequency at cell transmit is (a) 825.030 MHz (b) 870.030MHz(c) 844.980MHz(d) 889.980MHz

Answer : d

232. The value of C/I at cell boundary for handoff should be (a) 15dB(b) 17dB(c) 16dB(d) 18dB

Answer : d

233. The soft handoff is applied to one kind of digital cellular system named as(a) FDMA(b) TDMA(c) CDMA(d) SDMA

Answer : c

234. In a normal handoff procedure, the request for a handoff is based on the (a) efficiency(b) Bandwidth(c) coverage(d) Signal strength

Answer : d235.AMPS Operates in the ______ band

(a) 800MHz(b) 900MHz(c) 1800MHz(d) 1900MHz

Answer : a

[Type text]

236. A___________ handoff is defined as a handoff which would normally occur, but it is prevented from happening.

(a) hard(b) soft(c) forced(d) delayed

Answer : c

237. Channel sharing is a _________ traffic relief scheme

(a) Short term (b) Long term(c) Both (a) and (b)(d) delayed

Answer : a

238. A Handoff is implemented on ___________ channel.

(a) voice (b) set-up(c) control(d) data

Answer : a

239. The ______ algorithm is based on assigning a channel dynamically but obeying the rule of reuse distance

(a) FBCA (b) HCA(c) DCA(d) FCA

Answer : a

240. The set-up channels are also called_________.(a) Assigned channels (b) Control channels

[Type text]

(c) call waiting signals(d) forward call signals

Answer : b

UNIT-V

241.The SIM card used in GSM mobile phone has _______ memory.(a) 4KB (b) 8KB (c) 16 KB (d) 64 KB

Answer: (b)242.The number of time-slots per RF channel bandwidth in GSM standard is

(a) 3 (b) 6 (c) 8 (d) 16

Answer: (c)

243. The frame period of one TDMA frame in GSM standard is

(a) 3.692 µs (b) 577 µs (c) 4.615 ms(d) 40 ms

Answer: (c)244. The ________ translates between the wireless interface and fixed wired

infrastructure protocols.

[Type text]

(a) MS (b) BSS(c) MSC(d) OMC

Answer: (b)245. The standard interface that connects a BTS to a BSC is called the _______

interface.(a) Um

(b) A-bis(c) A (d) D

Answer: (b)

[Type text]

246 .The _______ is the database at MSC that keeps the information about the identity of

mobile phone

equipments.

(a) HLR (b) VLR (c) AUC(d) EIR Answer: (d)

247.The _______ standard interface allows a service provider to use base stations and

switching equipment made by different manufacturers.

(a) Um

(b) A-bis(c) A (d) D Answer: (c)

248. The ____________ layer in GSM signaling protocol architecture specifies the

modulation and coding techniques used in the system.

(a) Physical (b) Data Link (c) Networking (d) Messaging

Answer: (a)249. The gross data rate of each carrier channel in GSM is (a)270.833 kbps (b)33.854 kbps (c)24.7 kbps (d)13.4 kbps

Answer: (a)

[Type text]

250. The _____________ is not a dedicated control channel but carries the same

information as SDCCH.(a)AGCH (b)SDCCH(c)SACCH (d)FACCH

Answer: (d)

251. The PCM speech coder has a data rate of _________ , which is considerably highfor

use with wireless systems. (a) 512 kbps (b) 256 kbps (c) 28 kbps (d) 64 kbps

Answer: (d)

252. One time slot of a TDMA frame in GSM standard contains __________ bits

encrypted data.(a) 156.25 (b) 114 (c) 57 (d) 26

Answer: (b)

253. A user occupying a single time slot has to wait for time duration of __________between two successive transmissions.

(a) 577 µs (b) 4.615 ms(c) 120 ms(d) 6.12 s

Answer: (b)

254. The purpose of ________________ user traffic data is to improve the signalquality

by distributing the effects of fading.

(a) speech coding

[Type text]

(b) channel coding (c) bit interleaving(d) equalization

Answer: (c)255. The ___________ modulation technique provides high spectrum efficiency and aconstant amplitude signal.

(a) FSK (b) QPSK (c) GMSK (d) OFDM

Answer: (c)256. There are _________ classes for the BTS radiated power ranging from +34 dBmupto +55 dBm in 3-dB steps.

(a) three (b) five (c) eight (d) ten

Answer: (c)

257 .The mobile subscriber is allowed to reduce its peak output power down to 20mW in

_______ steps.

(a) 1 dB (b) 2 dB (c) 3 dB (d) 4 dB

Answer: (b)

258. When ___________________ is a problem, the GSM system allows for

frequency hopping.

(a) cochannel interference (b) adjacent channel interference (c) near-to-far interference (d) multipath fading

Answer: (d)259. The frequency-hopping algorithm employed in GSM provides change in thetransmission frequency once every

[Type text]

(a) 6.12 s (b) 120 ms(c) 4.615 ms(d) 577 µs

Answer: (c)260. Soft handoff is applied to one kind of digital cellular system named [ ]

(a) FDMA(b) TDMA(c) CDMA(d) NoneAnswer: (c)

261. ——— is a globally accepted standard for digital cellular communication. It is also the name of a standardization group founded in 1982 to create a common mobile telephone standard in Europe.

(a) GSM(b) CDMA(c) both a & b(d) FDMA

Answer : a

262 .Type of modulation that GSM uses

(a) GMSK(b) BPSK(c) QPSK(d) b and c

Answer : a

263. The following technology does not require the SIM card

(e) CDMA(f) GSM(g) both(h) FDMA

Answer : a

[Type text]

264. GSM is a ——— digital system that converts voice and access information to digital data, and communicates those data in bursts during brief time slots allocated to multiple subscribers sharing a radio channel.

(a) CDMA(b) TDMA(c) FDMA(d) both c and d

Answer : b

265.3G technology is a combination of

(a) SDMA and TDMA(b) GSM and CDMA (WCDMA)(c) FDMA and GSM(d) None of the above

Answer : c

266.——— technology offers general packet radio service

(a) CDMA(b) GSM(c) both a and b(d) FDMA

Answer : b

267.The features and benefits expected in the GSM system are

(a) superior speech quality(b) low terminal, operational, and service cost.(c) international roaming(d) all of the above

Answer : d

268. In GSM 900 with FDM: 124 frequencies (up/down) and TDM: 8 slots/frequency Max number of active users are

(a) 124/8(b) 8/124(c) 124 × 8

[Type text]

(d) 12 4 × 8/132

Answer : c

269. GSM allows a reuse factor of ________

(a) 1(b) 3(c) 5(d) 7

Answer : b

270. The_______________ performance of the RR functions.

(a) OSS 1(b) NSS(c) BSS(d) MS

Answer : C271. The type of Access technology which can enhance the battery life is

(a) CDMA 1(b) TDMA(c) OFDMA(d) SSMA

Answer : b

273. The __________ cellular phone system will provide universal personal communication.

(a) FIRST GENERATION(b) SECOND GENERATION(c) THIRD GENERATION(d) FOURTH GENERATION

Ans0wer : c

273. The operational frequency range of personal communication network(PCN) is

[Type text]

(a) 806-960 MHz(b) 1.7GHz-1.88GHz(c) 2500-2690 MHz(d) 300-3000 MHz

Answer : b

274. A PN sequence generated using a tapped n-bit shift register has a period of

(a) n(b) 2n-1

(c) 2n

(d) 2n-1

Answer : d

276. The NA-TDMA digital cellular system uses a constant envelope modulation scheme called

(e) AM(f) FM(g) ASK(h) DQPSK

Answer : d277 .The ____________are implemented as stand-alone nodes

(a) AUC(b) EIR(c) BOTH (a) AND (b)(d) NONE

Answer : c278.The _________ is a database that contains information about the identity of mobile equipment that prevents calls from stolen, unauthorized, or defective mobile stations.

(a) EIR(b) AUC(c) HLR(d) XME

Answer : a

[Type text]

279.The GSM network is divided in to three major systems

(a) NSS,BSS,OSS(b) BTS,BSC,MSC (c) CELL,BTS,BSC (d) NONE

Answer :a

280.The __________ protects network operators from different types of fraud found in todays’s cellular world

(a) EIR(b) AUC(c) XME(d) SMSC

Answer :b

281.Which of these performs such functions such as toll ticketing,networkinterfacing,common channel signaling?

(a) MSC(b) VLR(c) HLR(d) AUC

Answer :a

282.Location area is an area covered by_________

(a) BTS(b) BSC(c) MSC(d) OPERATOR

Answer :c

283.GSM is a digital system with an over the- bit -rate of ___________

(a) 9.6 kbps(b) 56 kbps(c) 144 kbps(d) 270 kbps

[Type text]

Answer :d

284.A 4kHZ analog speech signal converts to 64kbps digital signal.then down coverts to ________kbps beforemodulation in GSM

(a) 4(b) 8(c) 13(d) 16

Answer :c

285.The separation between adjacent carrier frequencies in GSM is _________

(a) 100 kHz(b) 200 kHz(c) 225 kHz(d) 250 kHz

Answer :b

286.Interface between MSC and BSC in GSM is called as ___________

(a) Air Interface(b) A-bis interface(c) A-interface(d) None

Answer :c

287.The interface between MS and BTS in GSM architecture is called as ____________

(a) Air-interface(b) A-bis interface(c) A- interface(d) None

Answer :a

288.GSM uses linear predictive codeing(LPC). The purpose of LPC is to __________ the bit rate .

(a) reduce(b) increase(c) maintain

[Type text]

(d) None

Answer :a

289.In GSM frequency hopping rate is _________

(a) 100 hops/s(b) 217 hops/s(c) 333 hops/s(d) 577 hops/s

Answer :b

290.Uplink frequency band in GSM___________

(a) 935 MHz-960 MHz(b) 890 MHz-915 MHz(c) 2110 MHz-2200 MHz(d) 2500 MHz-2690 MHz

Answer :b

291.Downlink frequency band in GSM___________

(a) 935 MHz-960 MHz(b) 890 MHz-915 MHz(c) 2110 MHz- 2200 MHz(d) 2500 MHz- 2690 MHz

Answer :a

292.In GSM architecture the maximum and average power of the mobile station should be ________.

(a) 1 W maximum, 125 mW average(b) 125 W maximum, 1 mW average(c) 10 W maximum, 1.25 W average(d) 50 W maximum, 12.5 W average

Answer :a

293.The bit period in GSM standard is ___________.

(a) 4.615 µs

[Type text]

(b) 3.692 µs(c) 5.77 µs(d) 2.70 µs

Answer :C

294.The transmitter/Reciever time slot spacing in GSM standard is __________

Time slots.

(a) 5(b) 3(c) 7(d) 9

Answer :b

295.In NA-TDMA each frame is __________ milli seconds long.

(a) 20(b) 40(c) 60(d) 80

Answer :b

296.In NA-TDMA numbers of time slots are ____________

(a) 3(b) 6(c) 8(d) 10

Answer :b

297.Each carrier of the CDMA standard occupies a ___________ bandwidth.

(a) 25 kHz(b) 30 kHz(c) 200 kHz(d) 1250 kHz

Answer :d

[Type text]

298.The CDMA reverse channel employees _____________ digital modulation technique.

(a) BPSK(b) QPSK(c) OQPSK(d) OFDM

Answer :c

299.CDMA is a multiple-access strategy for wireless communications based on _____________ technique.

(a) DSSS(b) SLOW FHSS(c) FAST FHSS(d) THSS

Answer :a

300._________ bit orthogonal Walsh codes are available for forward traffic channel in CDMA standard.

(a) 16(b) 32(c) 64(d) 128

Answer :c