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GSM Questions and Answers

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This article lists 100 GSM MCQs for engineering students. All the GSM Questions & Answers given below include a solution and where a possible link to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on the GSM topic which is core in Electronics & Communication Engineering.

GSM is the protocol introduced by the European Telecommunications Standards Institute (ETSI). It is a circuit-switching network that offers full-duplex voice communication over telephony.

Firstly, the data is used to transfer through circuit switching. Later improvements in the field of communication made it possible to transfer the data by converting it in the form of packets through General Packet Radio Service (GPRS) & by Enhanced Data Rates for GSM Evolution (EDGE).

The Cellular networks used in devices like tablets and mobile phones follow GSM protocols. GSM accepts, digitizes the data and after compressing the data is sent down to a channel.

1). The first generation cellular systems provide ___________ services for communication.
HintIn the 1980s the analog 1G communication has been started
2). 1G technology uses _______ for the division of channels.
HintThe allocated band of frequency for the communication is divided into thirty channels
3). ____________ is a cellular system uses FDMA and follows analog medium for communication.
HintAdvanced Mobile Phone Service or AMPS
4). Cellular services utilizes ________ transmitters.
Hint Low-power transmitters where the frequency can be reused.
5). GSM is a secure _______ system.
Hint GSM network are digitalized and follow wireless communication.
6). Firstly GSM was deployed in _________.
HintFinland in December 1991.
7). The standard for GSM was developed by ____________.
HintEuropean communities in the year 1988.
8). In which year the frequency standard band for the GSM network was extended from 900 MHz to the 1800 MHz?
Hint1800 MHz become operational in 1993
9). The first person to make call on network of GSM was ________.
HintGSM network on July 1, 1991
10). The first call of GSM was made on the ________ network.
HintFinnish operator of GSM established on 19th of September 1988
11). First network operator of mobile to shut down GSM is ________.
Hint Network operator located in Australia
12). The second network operator to shut GSM is __________.
Hint Telecommunication company located in America
13). GSM in Asia and Europe is operated at __________ MHz band of frequency.
HintVarious countries have a different range of frequencies
14). In United States GSM is operated at _______ MHz frequency band.
HintFor the voice and data services
15). The separation of carrier in GSM 2G technologies is __________.
HintInvolvement of FDMA results in the division of frequency
16). Which windowing technique is used by the GSM codec for coding speech?
HintReduces ripple and gives an accurate spectrum
17). Which filter is used at the decoder of GSM to pass the received signal?
HintLTP is the acronym for Long-Term Prediction
18). The cryptography algorithms used in GSM are__________.
HintAlgorithms are used for providing privacy over the air
19). How many different types of cell sizes present in the GSM network?
HintMacro, micro, pico, femto, and umbrella cells
20). The type of cell in which the height of antenna is above the average level of roof top is ______.
HintMacro cells are used to provide the radio coverage
21). In the GSM system the type of cell whose antenna height is under the average level of roof top is ______.
HintMicro cells are used for limited coverage
22). The type of cell sizes preferred in the urban locations is ________.
HintMicro cell serves the radio coverage from the cell site of low power
23). A _________ is a cell in the network of mobile phones which provides radio coverage from the cell site with high power.
HintMacro cells are used in maximum coverage areas
24). The type of cell sizes preferred for the indoor locations is _________.
HintThe cellular base stations of pico cells are small
25). The connection between the service providers through a broadband is made possible by ______ cells.
HintFemto cells are used as the subset

GSM Interview Questions & Answers

26). In practical the longest distance supported by the GSM system is ______ (Kilo meters).
HintType of cell, antenna, timing to travel the signal, and the terrain the distance and the coverage area vary
27). SIM in the GSM network stands for _______.
HintRetain the information once the handsets are switched
28). Other than GSM _______ provides a great security with the key for longer authentication amid user and the network.
HintUSIM provides two ways of authentication
29). SIM card is protected by using _________.
HintTo protect the data PIN is provided
30). A PIN used to protect SIM card has _____ digits.
HintUnique for each card
31). Mobility management and the call out functions for the mobile phone roaming are carried out by __________.
HintCore network
32). ________ used by the service providers of telecommunications to manage networks.
HintMaintenance of the network.
33). In GSM system customer care service is a part of __________.
HintRequires intervention to be done manually
34). The voice codec used in GSM follows a system of _________.
HintLinear predictive Coding used in the GSM
35). The frequency in the GSM is selected by the operator. Further it is divided into ________.
HintEach phone has its slot of time
36). GSM system consists of eight ________ speech channels for each radio frequency.
HintDivision of speech channels per frequency
37). GSM system consists of sixteen ________ speech channels for each radio frequency.
HintA half-rate channel utilizes alternate frames
38). The timeslots in the GSM are grouped to form a _______ frame.
HintTDMA is a channel accessing method
39). The duration of the frame of GSM carrier frequencies is ________ (ms).
Hint GSM consists of eight slots of time
40). The user in the GSM system can change the operator by changing the _____.
HintSIM represents the type of network operator
41). USIM is introduced due to the development of _______.
HintUMTS developed offers longer authentication with an optional feature of USIM
42). USIM stands for _____________.
Hint Offers longer keys of encryption as well as authentication
43). Mobile phones with GSM are ______ and ______ carriers.
HintSwitching from one operator to another is convenient
44). SIM cards can be used on ________ phones.
Hint Preferably used in the GSM network
45). GSM is a cellular network with a group of cell in it known as ____________.
HintUsers communicating to a group of cells
46). GSM offers services like _________.
HintVoice, data, and roaming services from basic to advance
47). The traffic amid mobile phone and the NSS is handled by __________.
HintBase station subsystem consists of a transceiver as well as a control unit
48). A GSM network is based upon _________ channels of traffic.
HintTiming slot or the channels present in the GSM has a connection
49). In the GSM network ___________ allows the user to alternate amid data and speech among the same conversation.
HintGIWU has both software and hardware
50). Each cell in the GSM network is identified by the __________ number designated to it.
HintTo identify the cell CGI is used

GSM Exam Question & Answers

51). Cell phones during manufacturing possess ________ number that will be permanent and unique.
Hint To find out whether the device reported has been stolen or not
52). Location area is a group of _____ in wireless communication.
HintEach cell is grouped from a location area (LA)
53). Which of these doesn’t come under the category of telephone services and are not supported by GSM?
HintSignal generated for mobile companies
54). ___________ in the GSM network the database required for managing and storing the subscriptions.
HintHome Location Register (HLR) is a part of the switching system
55). The permanent data of the subscriber is stored in _______.
HintSubscriber's profile is stored permanently in the HLR
56). When the subscription is bought from the PCS operators the subscribers registered in _______ of the operator.
HintManagement of any operator are undertaken by the HLR.
57). _________ is always attached with MSC.
HintVLR is a database that requests the information from HLR
58). ____________ stores the data about subscribers temporarily.
HintVLR holds the data temporarily
59). __________ protects the operators from the frauds occur in this world of cellular technology.
HintAUC verifies the identity of the user
60). _________ and _________ are either enforced as free-standing nodes or forms a combine node.
HintAUC provides the parameters required for encryption, EIR has the data stored about mobile pieces
61). A Base Station System (BSS) consists of __________.
HintBSCs that controls the functions and BTSs to handle the interfaces
62). A group formed by BTSs is controlled by a ________.
HintBSC controls the functions
63). The maximum transceivers handled by BTS are ________.
HintBTS can handle from 1 to 16 numbers of transceivers
64). In telecommunications OMC stands for ___________.
HintOMC is the center connected to the pieces of equipment
65). OSS stands for __________.
HintOperation and Support System
66). ___________ is a node that interconnects two networks.
HintGateway is the term used to show the interconnection
67). GMSC stands for _________.
HintA special category of MSC is used known as GMSC
68). ____________ is known as controlling center of NSS.
HintMSC is known for connecting the calls among the subscribers
69). In GSM the area under a single transmitter is known as ________.
Hint GSM is known as a cellular network
70). __________ node provides intelligent services of network.
HintMSN provides IN services it has nodes of a network
71). The traffic in between of mobile phone and the NSS is handled by _________.
HintBSS consists of BTS to communicate and the controller
72). ___________ is referred to as the core network part of GSM.
HintNSS helps in the tracking of the location of the callers
73). GSM operators possess _____ agreements with the operators in the foreign countries.
HintRoaming agreements will be made by the operators
74). To make processor or any other computer to communicate with a network ________ device is used.
HintGSM Modem consists of a slot to insert a SIM card
75). In the GSM network GPRS is a part present in ____________.
HintNSS is the core part of the network

GSM MCQs with Answers

76). A BTS commonly in public is referred to as __________.
HintMobile towers consist of antennas to receive and send the signals
77). GSM facilitates the cell phones to connect to a network by searching _________.
Hint A cell is the basic unit of communication
78). The list of queries a subscriber made is charged by the network can be defined as _________.
HintAoC is the supplementary service
79). ____________ service is used by the network providers to recover the dues.
HintOther than recovering dues call barring service is not subscribed
80). Which service is not extra charged by the service providers?
HintCall conferencing is a free service
81). If the calls are made to specified subscribers in a group and based on that special concession is provided to the users. This terminology is referred to as _________.
Hint CUG is the most popular supplementary service
82). The charges in the GPRS service depends upon per ___________ data uploaded or downloaded.
HintKilo Bytes is the basic unit
83). TMSI stands for _____________.
HintTMSI to ensure the subscriber’s privacy
84). How many nodes were introduced to the existing core network of GSM?
HintCore network has two entities referred to as nodes
85). Data transmission in GSM is done through ________.
Hint GPRS is the service developed based upon GSM
86). ___________ service in GSM utilizes the spectrum on need.
HintGPRS is an optimized resource of the network
87). A _____ node is the supporting node for GPRS in GSM.
HintA node supporting GPRS in the core networking of GSM is GSN
88). The node variants of GSN in GPRS are ___________.
HintGSN has two variants
89). In GPRS the ciphering is performed between MS and ___________.
HintSGSN is the serving node of GPRS
90). GPRS transfers the data in ______ format.
HintPacket switching technique
91). EDGE service belongs to__________ generation.
HintEDGE is also referred to as an Enhanced GPRS
92). Due to interference or some other reasons if it is necessary to make a change in the slot or the frequency utilized by a user results in handover. This type of the handover in GSM is known as ________.
HintMobile attached to the transceiver base station doesn't change
93). The handoff occurred when the cell phone moves out from the coverage offered by one of the BTS to another one but the BSC shared for both BTS is the same known as________.
HintBefore the release from the old BTS, a new slot and the channel are assigned by the BSC
94). ___________ handover is under the control of MSC.
HintWhen the mobile tends to move from the control of one BSC to another BSC
95). The handover occurred due to the change in between the networks is ________.
HintHandover is controlled by the involvement of two MSCs
96). The handovers occurred in between various accessing radio technologies is ___________.
HintMigration from one technology to another (i.e. from 2G to 3G, HSPA, LTE….)
97). The base station handovers cell phone with the details of the new cell without providing any synchronization and linking results in ________handover.
HintNon-synchronized handover of inter-cell
98). __________ handover utilizes the list of neighboring base stations to select a suitable one.
HintHandovers occur without any synchronization of time
99). In which handover mobile transmits the bursts on the latest channel to access the new base station?
HintSynchronize with the new base station and re-establish the communication
100). MSC in which the handover gets initiated is known as ______.
HintAnchor MSCs maintains the stability in call connection
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