McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electronics and Telecommunication Engineering [ENTC] .
| 51. |
Discretization of multipath delay axis of impulse response into equal time delay segments is called __________ |
| A. | Excess delay bins |
| B. | Delay bins |
| C. | Discrete bins |
| D. | Digital bins |
| Answer» A. Excess delay bins | |
| 52. |
In cellular telephone network, which component controls the switching between public wireline telephone network and the base station of cells for supporting the different calls between landline to mobile, mobile to landline and mobile to mobile calls? |
| A. | Electronic Switching Center (ESC) |
| B. | A Cell Controller |
| C. | Radio Transmitter & Receiver |
| D. | A common communication protocol |
| Answer» A. Electronic Switching Center (ESC) | |
| 53. |
In a cellular telephone system, which type of interference results from imperfect design of filters in receivers by allowing nearby frequencies to enter the receiver? |
| A. | Co-channel Interference |
| B. | Adjacent-channel Interference |
| C. | Both a and b |
| D. | None of the above |
| Answer» B. Adjacent-channel Interference | |
| 54. |
If the system is designed with the usage of hexagonal-shaped cells, how are the base-stations located? |
| A. | At the centre of cell |
| B. | At the edge of cell |
| C. | At the corner of the cell |
| D. | All of the above |
| Answer» D. All of the above | |
| 55. |
Station Busy is sometime called |
| A. | Fast Busy |
| B. | Slow Busy |
| C. | Short Busy |
| D. | Long Busy |
| Answer» B. Slow Busy | |
| 56. |
Relation between gain and effective aperture is given by ______ |
| A. | G=(4πAe)/λ2 |
| B. | G=(4π λ2)/ Ae |
| C. | G=4πAe |
| D. | G=Ae/λ2 |
| Answer» A. G=(4πAe)/λ2 | |
| 57. |
Which of the following is not an advantage of micro cell zone technique? |
| A. | Reduced co channel interference |
| B. | Improved signal quality |
| C. | Increase in capacity |
| D. | Increasing number of base stations |
| Answer» D. Increasing number of base stations | |
| 58. |
Which of the following is not a channel parameter? |
| A. | Bandwidth |
| B. | Coherence time |
| C. | Rms delay spread |
| D. | Doppler spread |
| Answer» A. Bandwidth | |
| 59. |
Flat fading channel is also known as _____ |
| A. | Amplitude varying channel |
| B. | Wideband channel |
| C. | Phase varying channel |
| D. | Frequency varying channel |
| Answer» A. Amplitude varying channel | |
| 60. |
For fast fading channel, the coherence time of the channel is smaller than _______ of transmitted signal. |
| A. | Doppler spread |
| B. | Bandwidth |
| C. | Symbol period |
| D. | Coherence bandwidth |
| Answer» C. Symbol period | |
| 61. |
The time dispersive properties of wideband multipath channel are quantified by ______ and _______ |
| A. | Mean excess delay, rms delay spread |
| B. | Doppler spread, rms delay spread |
| C. | Doppler spread, coherence time |
| D. | Mean excess delay, Doppler spread |
| Answer» A. Mean excess delay, rms delay spread | |
| 62. |
The received power of a wideband signal fluctuates significantly when a receiver is moved about a local area. State whether True or False. |
| A. | True |
| B. | false |
| C. | Both A and B |
| D. | Cant Say |
| Answer» B. false | |
| 63. |
Why is the phase of individual multipath components are not received in RF Pulse system? |
| A. | Due to use of duplexer |
| B. | Due to use of ADC |
| C. | Due to use of flip flops |
| D. | Due to use of envelope detector |
| Answer» D. Due to use of envelope detector | |
| 64. |
Anyone who uses atelephone or data modem on the telephone circuit is a part of globle communication network called as__________________ and the pair of wires connecting a subscriber to the closest telephone office is called as ____________________. |
| A. | Personal Mobile Telephone Network,Twisted Pair |
| B. | World Wide Web, Subscriber Line |
| C. | Internet, Drop Line |
| D. | Public Telephone Network, Local Loop |
| Answer» D. Public Telephone Network, Local Loop | |
| 65. |
Free space propagation model is to predict ______,Which of the following do not undergo free space propagation? |
| A. | Received signal strength,Wired telephone systems |
| B. | Transmitted power, Satellite communication system |
| C. | Gain of transmitter,Microwave line of sight radio links |
| D. | Gain of receiver, Wireless line of sight radio links |
| Answer» A. Received signal strength,Wired telephone systems | |
| 66. |
The free space model predicts that received signal decays as a function of _____ |
| A. | Gain of transmitter antenna |
| B. | T-R separation |
| C. | Power of transmitter antenna |
| D. | Effective aperture of the antenna |
| Answer» B. T-R separation | |
| 67. |
Which hand-off stage deals with the relinquishment of unnecessary frequency channels by keeping the availability for other mobile users? |
| A. | Initialization |
| B. | Resource Reservation |
| C. | Call Execution |
| D. | Call Completion |
| Answer» D. Call Completion | |
| 68. |
Free space propagation model is to predict ______ and Propagation model that characterize rapid fluctuation is called ________ |
| A. | Transmitted power,Hata model |
| B. | Received signal strength, Fading model |
| C. | Gain of transmitter, Large scale propagation model |
| D. | Gain of receiver,Okumura model |
| Answer» B. Received signal strength, Fading model | |
| 69. |
Differentiate GSM and DECT. |
| A. | Both B and C |
| B. | GSM -Range is up to 70km. DECT-Range is limited to about 300m. |
| C. | GSM- Global systems for mobile communications DECT- Digital enhanced cordless elecommunications |
| D. | None of the above |
| Answer» A. Both B and C | |
| 70. |
______ leads to time dispersion and frequency selective fading. What is characteristic of flat fading? |
| A. | Doppler spread, Mobile radio channel has constant gain |
| B. | Multipath delay spread, Non linear phase response |
| C. | Time dispersive parameters, Linear phase response |
| D. | Frequency delay spread,Bandwidth is greater than the bandwidth of transmitted signal |
| Answer» B. Multipath delay spread, Non linear phase response | |
| 71. |
What is the order of typical values of rms delay spread in outdoor mobile radio channels? |
| A. | Microseconds |
| B. | Nanoseconds |
| C. | Seconds |
| D. | Minutes |
| Answer» A. Microseconds | |
| 72. |
Power delay profile and magnitude frequency response of a mobile radio channel are related through _______ |
| A. | Laplace Transform |
| B. | Fourier Transform |
| C. | S Transform |
| D. | Wavelet Transform |
| Answer» B. Fourier Transform | |
| 73. |
_____ and coherence bandwidth are inversely proportional to one another.Coherence bandwidth is a statistical measure of range of frequencies over which channel is considered _______ |
| A. | Rms delay spread, Flat |
| B. | Mean excess delay,Frequency selective |
| C. | Excess delay spread,Time variant |
| D. | Doppler spread, Time dispersive |
| Answer» A. Rms delay spread, Flat | |
| 74. |
Verify True or False A.Frequency domain channel sounding technique do not require hard wired synchronization between transmitter and receiver. B.There is no relationship between time domain and frequency domain techniques. |
| A. | Both Statements True |
| B. | Both Statements False |
| C. | Only A true |
| D. | Only B true |
| Answer» D. Only B true | |
| 75. |
Which of the following is not an advantage of spread spectrum channel sounding system? |
| A. | Real time |
| B. | Rejection of passband noise |
| C. | Coverage range improvement |
| D. | Less transmitter power required |
| Answer» A. Real time | |
| 76. |
Verify True or False A. Impulse response is a narrowband characterization. B.Impulse response does not play any role in characterization of the channel. |
| A. | Both Statements True |
| B. | Both Statements False |
| C. | Only A true |
| D. | Only B true |
| Answer» B. Both Statements False | |
| 77. |
Which of the following is the world’s first cellular system to specify digital modulation and network level architecture? |
| A. | GSM |
| B. | AMPS |
| C. | CDMA |
| D. | IS-54 |
| Answer» A. GSM | |
| 78. |
Who set the standards of GSM? |
| A. | ITU |
| B. | AT & T |
| C. | ETSI |
| D. | USDC |
| Answer» C. ETSI | |
| 79. |
Which of the following memory device stores information such as subscriber’s identification number in GSM?
|
| A. | Register |
| B. | Flip flop |
| C. | SIM |
| D. | SMS |
| Answer» C. SIM | |
| 80. |
Which of the following does not come under subsystem of GSM architecture? |
| A. | BSS |
| B. | NSS |
| C. | OSS |
| D. | Channel |
| Answer» D. Channel | |
| 81. |
Which of the following subsystem provides radio transmission between mobile station and MSC? |
| A. | BSS |
| B. | NSS |
| C. | OSS |
| D. | BSC |
| Answer» A. BSS | |
| 82. |
____ manages the switching function in GSM. |
| A. | BSS |
| B. | NSS |
| C. | OSS |
| D. | MSC |
| Answer» B. NSS | |
| 83. |
______ supports the operation and maintenance of GSM. |
| A. | BSS |
| B. | NSS |
| C. | OSS |
| D. | MSC |
| Answer» C. OSS | |
| 84. |
Which modulation technique is used by GSM? |
| A. | GMSK |
| B. | BPSK |
| C. | QPSK |
| D. | GFSK |
| Answer» A. GMSK | |
| 85. |
Which one is not a TDMA standard of second generation networks? |
| A. | GSM |
| B. | IS-136 |
| C. | AMPS |
| D. | PDC |
| Answer» C. AMPS | |
| 86. |
Which is one of the disadvantages of 2G standards? |
| A. | Short Messaging Service (SMS) |
| B. | Digital modulation |
| C. | Limited capacity |
| D. | Limited Internet Browsing |
| Answer» D. Limited Internet Browsing | |
| 87. |
The 2G GSM technology uses a carrier separation of _______ |
| A. | 1.25 MHz |
| B. | 200 KHz |
| C. | 30 KHz |
| D. | 300 KHz |
| Answer» B. 200 KHz | |
| 88. |
GSM is an example of |
| A. | TDMA cellular systems |
| B. | FDMA cellular systems |
| C. | CDMA cellular systems |
| D. | SDMA cellular systems |
| Answer» A. TDMA cellular systems | |
| 89. |
GSM stands for... |
| A. | Group Spécial Mobile |
| B. | Global System for Mobile Communications |
| C. | Great Streaming of Media |
| D. | Global Standard of Mobile Communications |
| Answer» B. Global System for Mobile Communications | |
| 90. |
What is the air interface between the Mobile Station (MS) and Base Transceiver Station (BTS) called? |
| A. | Um |
| B. | Abis |
| C. | A |
| D. | HLR |
| Answer» A. Um | |
| 91. |
What is the basic service unit of GSM communications? |
| A. | Location Area |
| B. | Cell |
| C. | OLMN Service Area |
| D. | MSC / VLR Service Area |
| Answer» B. Cell | |
| 92. |
The first cellular systems were.... |
| A. | Analogue |
| B. | Digital |
| C. | Carrier waves |
| D. | Modulating waves |
| Answer» A. Analogue | |
| 93. |
The Base Station Subsystem (BSS) comprises of what? |
| A. | The Base System Transcontroller and Base Station Condenser |
| B. | The Base Transceiver Station and Base Station Controller |
| C. | The Base Transcript System and Base System Computer |
| D. | The Transfer Station and Base Station Computer |
| Answer» B. The Base Transceiver Station and Base Station Controller | |
| 94. |
The Base Station Controller (BSC) communicates with the Base Transceiver Station (BTS) over what interface? |
| A. | Hertz |
| B. | Tx / Rx |
| C. | Abis |
| D. | Cbit |
| Answer» C. Abis | |
| 95. |
A duplex transmission is realized in 2G GSM with the help of …….. |
| A. | FDD |
| B. | TDD |
| C. | a and b |
| D. | None of the above |
| Answer» A. FDD | |
| 96. |
FDD stands for …….. |
| A. | Frequency Division Duplex |
| B. | Full Division Duplex |
| C. | Frequency Double Duplex |
| D. | Frequency Duplex Division |
| Answer» A. Frequency Division Duplex | |
| 97. |
What is the interface between the BSS and MSC? |
| A. | Um |
| B. | Abis |
| C. | A |
| D. | None of the above |
| Answer» C. A | |
| 98. |
SIM stands for.... |
| A. | Serial Identity Master |
| B. | Subscriber Interface Marker |
| C. | Subscriber Identity Module |
| D. | System Interface Module |
| Answer» C. Subscriber Identity Module | |
| 99. |
2G standards support |
| A. | Limited internet browsing |
| B. | Short Messaging Service |
| C. | Both a & b |
| D. | None of the above |
| Answer» C. Both a & b | |
| 100. |
GSM system is a …………..system. |
| A. | Frequency division |
| B. | Time Division |
| C. | CDMA |
| D. | a and b |
| Answer» D. a and b | |
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