GSM Questions and AnswersMarch 9, 2021 By WatElectronics This article lists 100 GSM MCQs for engineering students. All the GSM Questions & Answers given below includes solution and where 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 GSM topic which is core in Electronics & Communiation 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.AnalogDigitalHybridAll the aboveHintIn the 1980s the analog 1G communication has been started 2). 1G technology uses _______ for the division of channels.TDMAFDMACDMASDMAHintThe 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.GSMAMPSD-AMPSNone of the aboveHintAdvanced Mobile Phone Service or AMPS 4). Cellular services utilizes ________ transmitters.High powerUltra-high powerLow powerBoth low and high powerHint Low-power transmitters where the frequency can be reused. 5). GSM is a secure _______ system.WiredWirelessSimpleComplexHint GSM network are digitalized and follow wireless communication. 6). Firstly GSM was deployed in _________.FinlandRussiaNorwaySwedenHintFinland in December 1991. 7). The standard for GSM was developed by ____________.Telecommunications Industry Association (TIA)International Telecommunications Union (ITU)European Telecommunications Standards Institute (ETSI)None of the aboveHintEuropean 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?1990199119921993Hint1800 MHz become operational in 1993 9). The first person to make call on network of GSM was ________.Pehr Evind SvinhufvudPaavo LipponenHarri HolkeriJuha SipilaHintGSM network on July 1, 1991 10). The first call of GSM was made on the ________ network.AlcomDNATeliaRadiolinjaHintFinnish operator of GSM established on 19th of September 1988 11). First network operator of mobile to shut down GSM is ________.AlcomElisaTelstraDNAHint Network operator located in Australia 12). The second network operator to shut GSM is __________.AlcomElisaTelstraAT & THint Telecommunication company located in America 13). GSM in Asia and Europe is operated at __________ MHz band of frequency.80090010001100HintVarious countries have a different range of frequencies 14). In United States GSM is operated at _______ MHz frequency band.8501900Both a and bNone of the aboveHintFor the voice and data services 15). The separation of carrier in GSM 2G technologies is __________.20 KHz30 KHz200 KHz300 KHzHintInvolvement of FDMA results in the division of frequency 16). Which windowing technique is used by the GSM codec for coding speech?Blackman WindowWelch WindowCosine WindowHamming WindowHintReduces ripple and gives an accurate spectrum 17). Which filter is used at the decoder of GSM to pass the received signal?LTP filterSTP filterQuantizerPLLHintLTP is the acronym for Long-Term Prediction 18). The cryptography algorithms used in GSM are__________.A5/1A5/2A5/3All the aboveHintAlgorithms are used for providing privacy over the air 19). How many different types of cell sizes present in the GSM network?3456HintMacro, 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 ______.Macro cellMicro cellPico cellUmbrella cellHintMacro 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 ______.Umbrella cellFemto cellPico cellMicro cellHintMicro cells are used for limited coverage 22). The type of cell sizes preferred in the urban locations is ________.Femto cellsPico cellsMicro cellsMacro cellsHintMicro 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.Femto cellPico cellMicro cellMacro cellHintMacro cells are used in maximum coverage areas 24). The type of cell sizes preferred for the indoor locations is _________.Femto cellsPico cellsMicro cellsMacro cellsHintThe cellular base stations of pico cells are small 25). The connection between the service providers through a broadband is made possible by ______ cells.Femto cellsPico cellsMicro cellsMacro cellsHintFemto cells are used as the subsetGSM Interview Questions & Answers 26). In practical the longest distance supported by the GSM system is ______ (Kilo meters).25354555HintType 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 _______.Subscriber Identity ModuleSubscriber Investigation MobileSubscriber Identification MobileSmart Identification ModuleHintRetain 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.SIMUSIMUMTSFPGAsHintUSIM provides two ways of authentication 29). SIM card is protected by using _________.Personal Identification Number (PIN)Mobile Identification Number (MIN)International Mobile Subscriber Identity (IMSI)Mobile Subscription Identification Number (MSIN)HintTo protect the data PIN is provided 30). A PIN used to protect SIM card has _____ digits.3456HintUnique for each card 31). Mobility management and the call out functions for the mobile phone roaming are carried out by __________.Base Station SubsystemNetwork Switching Subsystem (NSS)GPRS Core NetworkOperations Support SystemHintCore network 32). ________ used by the service providers of telecommunications to manage networks.Base Station SubsystemNetwork Switching SubsystemGPRS Core NetworkOperations Support System (OSS)HintMaintenance of the network. 33). In GSM system customer care service is a part of __________.Base Station SubsystemNetwork Switching SubsystemGPRS Core NetworkOperations Support SystemHintRequires intervention to be done manually 34). The voice codec used in GSM follows a system of _________.Huffman codingLinear Predictive codingLine codingCryptographic codingHintLinear predictive Coding used in the GSM 35). The frequency in the GSM is selected by the operator. Further it is divided into ________.FramePacketTimeslotsBitsHintEach phone has its slot of time 36). GSM system consists of eight ________ speech channels for each radio frequency.Full rateDuplexHalf rateFull duplexHintDivision of speech channels per frequency 37). GSM system consists of sixteen ________ speech channels for each radio frequency.Full rateDuplexHalf rateFull duplexHintA half-rate channel utilizes alternate frames 38). The timeslots in the GSM are grouped to form a _______ frame.CDMATDMAOFDMASDMAHintTDMA is a channel accessing method 39). The duration of the frame of GSM carrier frequencies is ________ (ms).3.6153.6264.5154.615Hint GSM consists of eight slots of time 40). The user in the GSM system can change the operator by changing the _____.MobileSIMNetworkBatteryHintSIM represents the type of network operator 41). USIM is introduced due to the development of _______.SIMCipher textUMTSEDGEHintUMTS developed offers longer authentication with an optional feature of USIM 42). USIM stands for _____________.Universal Subscriber Identity ModuleUniversal Subscriber Investigation MobileUniversal Smart Identification ModuleUniversal Smart Investigation MobileHint Offers longer keys of encryption as well as authentication 43). Mobile phones with GSM are ______ and ______ carriers.Unlocked, switchedLocked, switchedUnlocked, protectedSwitched, protectedHintSwitching from one operator to another is convenient 44). SIM cards can be used on ________ phones.CDMAGSMBoth CDMA and GSMWCDMAHint Preferably used in the GSM network 45). GSM is a cellular network with a group of cell in it known as ____________.NodeClusterBridgeHubHintUsers communicating to a group of cells 46). GSM offers services like _________.voiceDataRoamingAll the aboveHintVoice, data, and roaming services from basic to advance 47). The traffic amid mobile phone and the NSS is handled by __________.Base Station SubsystemNetwork Switching SubsystemGPRS Core NetworkOperations Support System (OSS)HintBase station subsystem consists of a transceiver as well as a control unit 48). A GSM network is based upon _________ channels of traffic.Connection lessConnection orientedCircuit switchedPacket switchedHintTiming 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.Message centerMobile service nodeGateway Mobile Services Switching CenterGSM interworking unit (GIWU)HintGIWU has both software and hardware 50). Each cell in the GSM network is identified by the __________ number designated to it.Integrated circuit card ID (ICCID)International Mobile subscriber Identity (IMSI)International Mobile Equipment Identity (IMEI)Cell Global Identity (CGI)HintTo identify the cell CGI is usedGSM Exam Question & Answers 51). Cell phones during manufacturing possess ________ number that will be permanent and unique.Integrated circuit card ID (ICCID)International Mobile subscriber Identity (IMSI)International Mobile Equipment Identity (IMEI)Cell Global Identity (CGI)Hint To find out whether the device reported has been stolen or not 52). Location area is a group of _____ in wireless communication.CellsMSCsMobile phonesBatteriesHintEach 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?Voice mailFax mailCall waitingDual-tone multi frequency (DTMF)HintSignal generated for mobile companies 54). ___________ in the GSM network the database required for managing and storing the subscriptions.Home Location Register (HLR)Visitor Location Register (VLR)Authentication Center (AUC)Equipment Identity Register (EIR)HintHome Location Register (HLR) is a part of the switching system 55). The permanent data of the subscriber is stored in _______.Home Location Register (HLR)Visitor Location Register (VLR)Authentication Center (AUC)Equipment Identity Register (EIR)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.Visitor Location Register (VLR)Home Location Register (HLR)Authentication Center (AUC)Equipment Identity Register (EIR)HintManagement of any operator are undertaken by the HLR. 57). _________ is always attached with MSC.Visitor Location Register (VLR)Home Location Register (HLR)Authentication Center (AUC)Equipment Identity Register (EIR)HintVLR is a database that requests the information from HLR 58). ____________ stores the data about subscribers temporarily.Visitor Location Register (VLR)Equipment Identity Register (EIR)Authentication Center (AUC)Home Location Register (HLR)HintVLR holds the data temporarily 59). __________ protects the operators from the frauds occur in this world of cellular technology.Visitor Location Register (VLR)Home Location Register (HLR)Authentication Center (AUC)Equipment Identity Register (EIR)HintAUC verifies the identity of the user 60). _________ and _________ are either enforced as free-standing nodes or forms a combine node.VLR and HLRHLR and AUCAUC and VLRAUC and EIRHintAUC provides the parameters required for encryption, EIR has the data stored about mobile pieces 61). A Base Station System (BSS) consists of __________.Base Station Controllers (BSCs)Base Transceiver Stations (BTSs)Both a and bNone of the aboveHintBSCs that controls the functions and BTSs to handle the interfaces 62). A group formed by BTSs is controlled by a ________.MSCBSCAUCMobile phoneHintBSC controls the functions 63). The maximum transceivers handled by BTS are ________.481632HintBTS can handle from 1 to 16 numbers of transceivers 64). In telecommunications OMC stands for ___________.Operations and Maintenance CenterOpen Method of CoordinationOperational Method for CoordinationNone of the AboveHintOMC is the center connected to the pieces of equipment 65). OSS stands for __________.Open-Source SoftwareOpen Source SystemOperator services SystemOperation and Support SystemHintOperation and Support System 66). ___________ is a node that interconnects two networks.ExclusionExpulsionGatewayDepartureHintGateway is the term used to show the interconnection 67). GMSC stands for _________.Gateway Mobile Switching CenterGateway Mobile Service CenterGlobal Mobile Satellite CommunicationGlobal Mobile Service CenterHintA special category of MSC is used known as GMSC 68). ____________ is known as controlling center of NSS.Base Station SubsystemOperations Support SystemGPRS Core NetworkMobile Switching Center (MSC)HintMSC is known for connecting the calls among the subscribers 69). In GSM the area under a single transmitter is known as ________.GatewayNodeCellHexagonHint GSM is known as a cellular network 70). __________ node provides intelligent services of network.Message center (MXE)Mobile Service Node (MSN)Gateway Mobile Services Switching CenterGSM interworking unit (GIWU)HintMSN provides IN services it has nodes of a network 71). The traffic in between of mobile phone and the NSS is handled by _________.Base Station Subsystem (BSS)Network Switching SubsystemGPRS Core NetworkOperations Support System (OSS)HintBSS consists of BTS to communicate and the controller 72). ___________ is referred to as the core network part of GSM.Base Station Subsystem (BSS)Network Switching Subsystem (NSS)GPRS Core NetworkOperations Support System (OSS)HintNSS helps in the tracking of the location of the callers 73). GSM operators possess _____ agreements with the operators in the foreign countries.Voice mailFax mailCall waitingRoamingHintRoaming agreements will be made by the operators 74). To make processor or any other computer to communicate with a network ________ device is used.GSM ModemRepeatersBridgesSIMHintGSM Modem consists of a slot to insert a SIM card 75). In the GSM network GPRS is a part present in ____________.BTSBSSNSSHLRHintNSS is the core part of the network GSM MCQs with Answers 76). A BTS commonly in public is referred to as __________.GatewayNodeCellMobile TowerHintMobile towers consist of antennas to receive and send the signals 77). GSM facilitates the cell phones to connect to a network by searching _________.CellsCryptographic AlgorithmsBoth a & bNone of the aboveHint 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 _________.Call barringCalling number identificationClosed User Group (CUG)Advice of Charge (AoC)HintAoC is the supplementary service 79). ____________ service is used by the network providers to recover the dues.Call barringCalling number identificationCall conferencingAdvice of ChargeHintOther than recovering dues call barring service is not subscribed 80). Which service is not extra charged by the service providers?Call barringCalling number identificationCall conferencingAdvice of ChargeHintCall 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 _________.Call barringCalling number identificationClosed User Group (CUG)Advice of Charge (AoC)Hint CUG is the most popular supplementary service 82). The charges in the GPRS service depends upon per ___________ data uploaded or downloaded.Kilo ByteMega ByteGiga ByteTera ByteHintKilo Bytes is the basic unit 83). TMSI stands for _____________.Temporary Mobile Servicing IndustryTemporary Mobile Subscriber IdentityTerminal Mobile Subscription IdentificationTemporary Mobile Service IdentificationHintTMSI to ensure the subscriber’s privacy 84). How many nodes were introduced to the existing core network of GSM?OneTwoThreeFourHintCore network has two entities referred to as nodes 85). Data transmission in GSM is done through ________.Voice mailEDGEGPRSUMTSHint GPRS is the service developed based upon GSM 86). ___________ service in GSM utilizes the spectrum on need.UDIUMTSGPRSNone of the AboveHintGPRS is an optimized resource of the network 87). A _____ node is the supporting node for GPRS in GSM.GSNGGSNSGSNAll the AboveHintA node supporting GPRS in the core networking of GSM is GSN 88). The node variants of GSN in GPRS are ___________.GGSNSGSNBoth a & bNone of the aboveHintGSN has two variants 89). In GPRS the ciphering is performed between MS and ___________.GGSNSGSNBoth a & bBTSHintSGSN is the serving node of GPRS 90). GPRS transfers the data in ______ format.BitsPacketFrameSegmentHintPacket switching technique 91). EDGE service belongs to__________ generation.1G2G2.5G3GHintEDGE 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 ________.Intra-BTS handoverInter-BTS Intra BSC handoverInter-BSC handoverInter MSC handoverHintMobile 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________.Intra-BTS handoverInter-BSC handoverInter-BTS Intra BSC handoverInter MSC handoverHintBefore 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.Intra-BTS handoverInter-BTS Intra BSC handoverInter-BSC handoverInter MSC handoverHintWhen 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 ________.Intra-BTS handoverInter-BTS Intra BSC handoverInter-BSC handoverInter MSC handoverHintHandover is controlled by the involvement of two MSCs 96). The handovers occurred in between various accessing radio technologies is ___________.Intra-BTS handoverInter-BTS Intra BSC handoverInter-BSC handoverInter-system handoverHintMigration 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.Inter-system handoverInter MSC handoverBlind handoverCompressed mode handoverHintNon-synchronized handover of inter-cell 98). __________ handover utilizes the list of neighboring base stations to select a suitable one.Inter-system handoverInter MSC handoverBlind handoverCompressed mode handoverHintHandovers occur without any synchronization of time 99). In which handover mobile transmits the bursts on the latest channel to access the new base station?Inter-system handoverInter MSC handoverBlind handoverNon-Synchronized handoverHintSynchronize with the new base station and re-establish the communication 100). MSC in which the handover gets initiated is known as ______.Gateway MSCVisited MSCAnchor MSCNone of the aboveHintAnchor MSCs maintains the stability in call connection Read More about GSM Time is Up!