MCQ's on Mobile Communication
1 DECT stands for
Answer Digital European Cellular Telex
or Digital Enhanced Cordless Telecommunications
2 World’s first cellular system was developed by
Answer: Nippon Telephone and Telegraph (NTT)
3 MIN stands for
Answer: Mobile Identification Number
3 NADC is a 2G standard for
Answer: TDMA
4 The 2G GSM technology uses a carrier separation of
Answer: 200 KHz
5 Radio capacity may be increased in cellular concept by
Answer: Increasing the number of base stations & reusing the channels
6 The shape of the cellular region for maximum radio coverage is
Answer: Hexagon
7 Hexagon shape is used for radio coverage for a cell because
A It uses the maximum area for coverage
B Fewer number of cells are required
C It approximates circular radiation pattern
D All of the above
8 In a fixed channel assignment strategy, if all the assigned channels are occupied, the call
Answer: Gets blocked
9 GSM is an example of
Answer: TDMA cellular systems
10 TDMA allows the user to have
Answer: Use of same frequency channel for different time slot
11 The early FM push-to-talk telephone systems were used in
Answer: Half duplex mode
12 Half duplex system for communication has
Answer: Communication in single direction at a time
13 The process of transferring a mobile station from one base station to another is
Answer: Hand off
14 The 2G cellular network use
A TDMA/FDD
B CDMA/FDD
C Digital modulation formats
D All of the above
15 2G standards support
A Limited internet browsing
B Short Messaging Service
16 Commonly used mode for 3G networks is
Answer: FDD
17 The interference between the neighboring base stations is avoided by
Answer: Assigning different group of channels
18 Global Positioning System uses
Answer: CDMA
19 SDMA technique employs
A Smart antenna technology
B Use of spatial locations of mobile units within the cell
20 The increased capacity of SDMA is due to
A Focused signal transmitted into narrow transmission beams
B Smart antennas pointing towards mobile stations
21 ———– introduced Frequency Modulation for mobile communication systems in 1935.
Answer: Edwin Armstrong
22 2G CDMA standard – cdma one supports up to
Answer: 64 users
23 3G W-CDMA is also known as
Answer: UMTS
24 In Handoff
A Process of transferring the call to the new base station
B Transfers the call
C New channel allocation is done
25 Interference in cellular systems is caused by
A Two base stations operating in same frequency band
B Two calls in progress in nearby mobile stations
C Leakage of energy signals by non cellular systems into cellular frequency band
D All of the above
26 The techniques used to improve the capacity of cellular systems are
Answer: Random access protocol
27 Which of the following is/are the main part(s) of basic cellular system.
A) A mobile Unit
B) A cell Site
C) A mobile Telephone Switching Office
D) All of the above
29 In .............. Frequency Spectrum is divided into smaller spectra and is allocated to each user.
C) FDMA
30 In ................ multiple access is achieved by allocating different time slots for the different users
A) TDMA
31 State whether True of False.
i) In GSM only TDMA is used.
ii) There is zero inter-channel interference in CDMA.
ans False, False
32 The basic GSM is based on ____________________ traffic channels.
answer connection oriented.
33 . ..................... are typically characterized by very small cells, especially in densely populated areas
answer 2.5G system.
34. Which mode is used for installing networks in wireless communication device characteristics?
Answer: Fixed and wired.
35 Wireless LANs implement security measures in the
Answer: Data Link Layer
36 Specifications for a wireless LAN are called
Answer: IEEE 802.11.
37 In wireless LAN, there are many hidden stations so we cannot detect the
Answer: Collision.
38 Term that is used for stationary or mobile wireless station and also have optional central base
station is called
Answer: Access point.
39 Wireless communication is started in
Answer: 1895.
40 MMP combines the concepts of _______ and ________
Answer: Mobile IPs, core based trees
41 Which type of handoff used in CDMA?
Answer: Soft handoff
42 The type of access used in GSM technology is
Answer: FDMA/TDMA
43 The type of Access technology which can enhance the battery life is
Answer: TDMA
44 The process of channel coding, Encryption, Multiplexing and modulation for Trans direction and reverse for reception are to be carried out by
Answer: BTS
45 Modulation technique used in DECT is
Answer: GFSK- Gaussian frequency-shift keying
46 IEEE has defined the specifications for a wireless LAN, called _______, which covers the physical and data link layers.
Answer: IEEE 802.11
47. In IEEE 802.11, a BSS without an AP is called an
Answer: an ad hoc architecture
48 In IEEE 802.11, the access method used in the DCF sublayer is _________.
Answer: CSMA/CA
49 In IEEE 802.11, the access method used in the PCF sublayer is ______.
Answer: polling
50 The IEEE 802.11b, uses _________.
Answer: DSS- Direct-sequence spread spectrum
51 The IEEE 802.11a, uses _________.
Answer: OFDM
52 The IEEE 802.11g, uses _________.
Answer: OFDM
53 The original IEEE 802.11, has a data rate of _____Mbps.
Answer: 1 mbps
54 IEEE 802.11a, has a data rate of _____Mbps.
Answer: 6
55 IEEE 802.11b, has a data rate of _____Mbps.
Answer: 5.5 mbps
56 IEEE 802.11g, has a data rate of _____Mbps.
Answer: 22 mbps
57 Bluetooth is a _______ technology that connects devices (called gadgets) in a small area.
Answer: wireless LAN
58 A Bluetooth network is called a ________.
Answer: piconet
59 A Bluetooth network consists of _____ primary device(s) and up to ____ secondary devices.
Answer: one; seven
60 In Bluetooth, the current data rate is ____Mbps
Answer: 1 mbps
61 In Bluetooth, the _______ layer is roughly equivalent to the physical layer of the Internet model.
Answer: radio
62 In Bluetooth, the _____layer is roughly equivalent to the MAC Answer: sublayer in LANs.
baseband
63 The access method in Bluetooth is ________.
Answer: TDD-TDMA
64 Bluetooth uses ______method in the physical layer to avoid interference from other devices or other networks
Answer: FHSS
65 What is the frequency range of the IEEE 802.11a standard?
Answer: 5GHz
66 What is the frequency range of the IEEE 802.11b standard?
Answer: 2.4GHz
67 What is the frequency reuse factor in CDMA?
Answer: 1
68 Transmission media are usually categorized as _______.
Answer: Guided or unguided
69 _______ cable is used for voice and data communications.
Answer: Twisted-pair
70 ________ are used for short-range communications such as those between a PC and A peripheral device.
Answer: Infrared waves
71 _______ is used for cellular phone, satellite, and wireless LAN communications.
Answer: Microwaves
72 Radio waves are _________
Answer: omnidirectional
73 Microwaves are _________.
Answer: Unidirectional
74 Location Area is an area covered by ______
Answer: MSC
75 GSM is a digital system with an over-the-air bit rate of _________
Answer: 270 kbps
76 GSM can best be called a system for
Answer: cellular telephony
77 What is the multiple access scheme used in GSM?
Answer: A combination of TDMA and FDMA
78 Bluetooth profiles are also referred to as:
Answer: Applications
79 The IEEE 802.11b standard is also known as:
Answer: WIFI
80 Which of the followings are the characteristics of WPAN
a. Short range
b. Low power
c. Low cost
d. Small networks
81 HCI is one of the Bluetooth transport protocols
Answer: false
82 Bluetooth devices use maximum of 79 RF channels throughout the world
Answer: false
83 Bluetooth ACL link is a best-effort link
Answer: true
84 State some of the features of CDMA
(a) Users of CDMA share the same frequency.
(b) CDMA has soft capacity limit.
(c) Multipath fading may be substantially reduced
(d) All of these
85 Define capacity of cellular systems
Answer: It can be defined as the maximum number of channels or users that can be provided in a fixed frequency band
86 What are the multiple access techniques?
(a) Frequency division multiple access
(b) Time division multiple access
(c) Code division multiple access
(d) all of these
87 What are the features of TDMA?
(a) TDMA shares a single carrier frequency with several users, where each user makes use of non overlapping time slots.
(b) Data transmission occurs in bursts.
(c) Handoff process is much simpler
(d) All of these
88 What are second generation are available?
(a) Global System Mobile (GSM) in Europe
(b) Interim standard
(c) Pacific Digital Cellular
(d) All of these
89 Write advantages 2G over 1G.
(a) Natural integration with the evolving digital wireless network
(b) Higher data rate
(c) Flexibility for capacity expansion
(d) All of these
90 What is service offered by GSM?
(a) Telephone services
(b) Bearer or Data services
(c) Supplementary services
(d) All of these
91 What is the function of NSS in GSM?
Answer:The NSS managing the switching function of the systems and allows the MSCs to communicate with other networks such as PSTN and ISDN.
92 Define the bursts.
Answer:Data is transmitted small portions called bursts.
93 What is Bluetooth?
Answer:Bluetooth is an open specification for the short range wireless voice and data communication that’s was originally developed for cable replacement in personal area networking to operate all over the world.
94 MAC stands as
Answer:Media Access Control
95 Several protocols for upper layers in bluetooth use _________
Answer: L2CAP
96 In Bluetooth, multiple ________ form a network called a _________.
Answer: piconets: scatternet
97 DHCP (dynamic host configuration protocol) provides __________ to the client.
Answer: IP address
98 DHCP is used for ________
Answer: Both IPv6 and IPv4
99 The DHCP server _________
a) maintains a database of available IP addresses
b) maintains the information about client configuration parameters
c) grants a IP address when receives a request from a client
d) all of the mentioned
100 DHCP uses UDP port _________ for sending data to the server.
Answer: 67
101 The DHCP server can provide the _______ of the IP addresses.
a) dynamic allocation
b) automatic allocation
c) static allocation
d) all of the mentioned
102 Which of the following stores all the user-related data that is relevant for the GSM system in mobile computing?
Answer: Sim
103 In which of the following Codes with specific characteristics can be applied to the transmission?
Answer: CDMA
104 Disadvantages of WLANs include —–
1 Interference and noise
2 Slower than wired
3 Greater care is needed for encryption
4 All of the above
105 Which of the following is the base of most mobile communications?
Answer: GSM
106 The base station covers a specific area that is called a —-
Answer: Cell
107 Bluetooth technology is used for —-
Answer:
Connection of peripheral devices
Ad-hoc networking
Bridging network gaps
All of the above
108 The advantages of WLANs are —–
Answer:
Flexibility
Robustness
Less cost
All of the above
109 Disadvantages of WLANs are —–
Answer:
Slow speed
Noise
More effort for Security
All of the above
110 In a piconet, the master device decides the —-
Answer:
Hopping pattern
Frequency reuse
Channels
All of the above
111 Which of the following are the characteristics of mobile computing?
Answer:
Limiting resource availability
Limited resource
High mobility
All of the above
112 A type of wireless transmission that uses red light not usually visible to human eyes
Answer: Infrared
113 A computer network in a limited geographical area that uses wireless transmission for communication
Answer: Wireless Local Area Network (WLAN)
114 __________ is a trunked radio system.
Answer: TETRA
115 Who invented the optical telegraph?
Answer: Claude Chappe
116 In which year, the telephone principle was introduced?
Answer:1861
117 A public telephone service was available in ________.
Answer: Berlin.
118 Cordless telephone was introduced in the year__________.
Answer: 1984
119 ___________ adopted the standard DECT for digital cordless telephony.
Answer: ETSI
120 _________ is the lowest layer in a communication system
Answer: Physical layer
121 ________ is responsible for routing packets through network.
Answer: Network Layer
122 ___________ is used in the reference model to establish an end-to-end connection.
Answer: Transport layer
123 __________ is situated at top of all transmission oriented layers.
Application Layer
124 Each transmitter in cellular systems is called a _________.
Answer: Base Station
125 In Which year GSM was Founded?
Answer: 1982
126 To reduce interference even further, _________ can be used.
Answer: sectorized antennas.
127 is specifically adapted to the wireless domain.
Answer: MAC
128 ____________ is a server problem of wireless networks using CDM
Answer: Near and Far Terminals.
129 ________ is used for allocating a separated space to users in wireless networks.
Answer: SDMA
130 _________ comprises all algorithms allocating frequencies to transmission channels according to the FDM
Answer: FDMA
131 TDMA stands for ____________.
Answer: Time division multiple access.
132 BTS stands for ____________.
Answer: Base transceiver station
133 WAP stands for _______
Answer: Wireless application protocol.
134 The symbol for radio interface is__________.
Answer: UM
135 The two basic settings for WLANs are ___________.
Answer: infrastructure and adhoc based.
136 The _________ management supports the association and re-association of a station to an access point and
roaming between different access points.
Answer: MAC
137 The technology aims at so called ad-hoc piconets is called ______.
Answer: bluetooth technology
138 The history of Bluetooth starts in _______ century
Answer: tenth
139 Bluetooth operates on __________ GHz band
Answer: 2.4
140 Using _________ a mobile phone can be connected to a PDA or laptop
Answer: wireless piconets
141 Bluetooth includes __________ channels
Answer: 79
142 Bluetooth applies _______ for interference migration.
Answer: FHSS
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