Description : A system that performs parallel-to-serial and serial-to-parallel conversion of data link. A. DCE B. DTE C. Modem D. PC
Last Answer : B. DTE
Description : The primary purpose of the data modem is to A. interface analog terminal equipment to analog communications channel B. interface digital terminal equipment to analog communications ... to digital communications channel D. interface digital terminal equipment to digital communications channel
Last Answer : B. interface digital terminal equipment to analog communications channel
Description : In indication signal for a handshake form the DCE to the DTE in response to an active condition for the request to send a signal. A. Data transmission B. Clear to send C. Receive data D. Data set ready
Last Answer : B. Clear to send
Description : ___________ is a device in data transmission to interface data terminal equipment to an analogue transmission line. A. RS 232 B. Connector C. Modem D. RJ-11 plug
Last Answer : C. Modem
Description : The x.25 standard specifies a a. technique for start-stop data b. technique for dial access c. DTE/DCE interface d. data bit rate e. none of above
Last Answer : DTE/DCE interface
Description : Which of the following is not referred to as data terminal equipment? A. Telephone set B. Printers C. Modem D. Computer
Description : Modem is referred to as ______. A. Universal asynchronous Rx/Tx B. Data communication equipment C. Universal synchronous Rx/Tx D. Data terminal equipment
Last Answer : B. Data communication equipment
Description : An important terminal that is required between DTE and PSTN is (A) Server (B) MODEM (C) Relay (D) Network card
Last Answer : (B) MODEM
Description : The correctness and accuracy of the transmitted message content is A. verified by the modem B. communications system C. determined by the sender and receiver D. ensured by use of digital technique
Last Answer : C. determined by the sender and receiver
Description : Which of the following statement is incorrect? a. Multiplexers are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line b. HDLC is a standard ... indicates that it is ready to accept data d. RTS/CTS is the way the terminal indicates ringing
Last Answer : RTS/CTS is the way the DTE indicates that it is ready to transmit data and the way the DCW indicates that it is ready to accept data
Description : Rules governing the transmission of digital information. A. Line protocol B. Isochronous C. Data communications D. Digital communications
Last Answer : B. Isochronous
Description : The key electronic component in a communications satellite is the A. telemetry equipment B. on-board computer C. command and control system D. transponder
Last Answer : D. transponder
Description : The conversion of digital signal into analog for purposes of transmitting into the telephone line is done through ______. A. ISDN B. Radio C. RS232C D. Modem
Last Answer : D. Modem
Description : These are used to connect non-ISDN equipment ot ISDN line. A. Digipeaters B. Terminal adapters C. Local repeaters D. Terminal repeaters
Last Answer : B. Terminal adapters
Description : ECE Board Exam March 1996 It is a spacecraft placed in orbit around the earth carrying onboard microwave receiver and transmitting equipments. A. Fiber optic equipment B. Communications satellite C. Wireless radio system D. Coaxial cable syste
Last Answer : B. Communications satellite
Description : In a synchronous modem, the digital-to-analog converter transmits signal to the a. equilizer b. modulator c. demodulator d. terminal e. none of aobve
Last Answer : equilizer
Description : What medium is used by IBM token ring network that operates at either 4 Mbps or 16 Mbps? A. Twisted pair B. Coaxial cable C. Fiber-optic D. Parallel-wire line
Last Answer : A. Twisted pair
Description : In what form does the information of data communications is transmitted between two points? A. Alphanumeric form B. Alphabetic form C. Numeric form D. Binary form
Last Answer : D. Binary form
Description : What is the data link protocol that is used in asynchronous transmission for transferring files from one computer to another? A. A modem B. X modem C. B modem D. C modem
Last Answer : B. X modem
Description : What is the data link protocol that is used in asynchronous transmission for transferring files from one computer to another? A. A modem B. X modem C. B modem
Description : Who is responsible in the correctness and accuracy of transmitted information content over a data communication? A. The channel B. The transmitter and receiver C. The modem D. The bridge
Last Answer : B. The transmitter and receiver
Description : Main basic components of a data communication are composed of the following. A. Computer, modern and router B. Computer, bridge and gateway C. Transmitter, channel and receiver D. Transmitter, computer and modem
Last Answer : C. Transmitter, channel and receiver
Description : In satellite communications, what means of attitude control is using the angular momentum of the spinning body to provide the roll and yaw stabilization? A. Spin stabilization B. Radial stabilization C. Three-axis stabilization D. Station keeping
Last Answer : A. Spin stabilization
Description : The executive branch of government in charge of policy making in the telecommunications. A. National telecommunications commission B. Telecommunications control bureau C. Department of transportation and communications D. Bureau of telecommunications
Last Answer : C. Department of transportation and communications
Description : Iridium satellites can provide data communications of up ____ bps data rate. A. 1200 B. 4800 C. 2400 D. 3840
Last Answer : C. 2400
Description : What satellite subsystem monitors onboard conditions such as temperature and battery voltage and transmits this data back to a ground station for analysis? A. Communications subsystem B. AKM C. TTC D. Transponder
Last Answer : C. TTC
Description : In telecommunications when we call data communications it means the transmission of________. A. Voice and video B. Voice C. Video D. Computer data
Last Answer : D. Computer data
Description : Which of the following is not a common microwave application? A. Radar B. Data transmission C. Space communications D. Mobile radio
Last Answer : D. Mobile radio
Description : RS-232, RS-449, RS-530, V, 24 and X.21 are examples of ____________. A. standards for interfaces between modems and transmission facilities B. standards for various types of ... for interfaces between terminals and modems D. standards for end to end performance of data communications system
Last Answer : C. standards for interfaces between terminals and modems
Description : Which of the following statement is correct? a. terminal section of a synchronous modem contains the scrambler b. receiver section of a synchronous modem contains the scrambler c. transmission section of ... d. control section of a synchronous modem contains the scrambler e. none of the above
Last Answer : transmission section of a synchronous modem contains the scrambler
Description : Which one out of these is not a data link layer technology: a. Bluetooth b. UART c. WIFI d. HTTP
Last Answer : d. HTTP
Description : hich one out of these is not a data link layer technology:- a) Bluetooth b) UART c) WiFi d) HTTP
Last Answer : d) HTTP
Description : Which one out of these is not a data link layer technology? A. Bluetooth B. UART C. Wi-Fi D. HTTP
Last Answer : D. HTTP
Description : A satellite transmitter operates at 4GHz with an antenna gain of 4dBi. The receiver 40000 km away has an antenna gain of 50 dBi. If the transmitter has a power of 8 W, find (ignoring feedline losses and mismatch) the EIRP in dBW. A. 50 B. 69 C. 49 D. 30
Last Answer : C. 49
Description : The final power amplifier in an FM transmitter usually operates class ______. A. AB B. C C. B D. A
Last Answer : B. C
Description : A coherent binary phase shift keyed BPSK transmitter operates at a bit rate of 20 Mbps with a carrier to noise ratio C/N of 8.8dB. Find Eb/No. A. 73 dB B. 62.4 dB C. 81.8 dB D. 8.8 dB
Last Answer : D. 8.8 dB
Description : Fiber optic cable operates near _______ frequencies. A. 800 THz B. 20 MHz C. 200 MHz D. 2 GHz
Last Answer : A. 800 THz
Description : The final amplifier of either FM or AM transmitter operates as A. Class B B. Class C C. Class A D. Class D
Last Answer : B. Class C
Description : What are the three stages through which PLL operates?
Last Answer : 1.Free running 2.Capture 3.Locked/ tracking
Description : What would be the proper command to set a DCE clock rate of 56k for a serial interface? A. Router (config) # clockrate 56000 B. Router# clockrate 56000. C. Router (config-if) #clock rate 56000 D. Router (config-if) # clockrate 56k
Last Answer : Router (config-if) #clock rate 56000
Description : Which circuit detects frequency modulated signal? A. Modulator B. Discriminator C. Demodulator D. Modem
Last Answer : B. Discriminator
Description : Synchronous modems cost more than asynchronous modem because _______. A. They have larger bandwidth B. They are larger C. The production volume is larger D. They have clock recovery circuits
Last Answer : D. They have clock recovery circuits
Description : The local loop of the telephone system is understood to be A. a single piece of wire connecting the subscriber's telephone set to another telephone set in an adjacent room B. a two-wire or four- ... a facsimile machine to a computer D. a group of wires connecting a telephone set to a modem
Last Answer : B. a two-wire or four-wire communication circuit between the customer’s premise and central office
Last Answer : Universal Asynchronous Receiver / Transmitter
Description : The main benefit of light-wave communications over microwaves or any other communications media is a. Lower cost b. Better security c. Wider bandwidth d. Freedom from interference
Last Answer : c. Wider bandwidth
Description : Which of the following is used as an optical receiver in fiber optics communications a. APD b. Tunnel diode c. Laser diode d. LED
Last Answer : a. APD
Description : Which of the following is used as an optical transmitter on the Fiber Optical Communications? a. APD b. LSA diode c. PIN diode d. LED
Last Answer : d. LED
Description : Is a non-coherent light source foe optical communications system. a. ILD b. LED c. APD d. PIN Diode
Last Answer : b. LED
Description : Which does not use vertical polarization antenna? A. AM Broadcasting B. FM Broadcasting C. Mobile Communications D. Satellite Communications
Last Answer : B. FM Broadcasting