Description : To couple a coaxial line to parallel line, it is better to use a ______. A. Slotted line B. Quarter-wave transformer C. Directional Coupler D. Balun
Last Answer : D. Balun
Description : To connect coaxial line to a parallel-wire _________ is the best to use. A. directional coupler B. quarter-wave transformer C. balun D. slotted line
Last Answer : C. balun
Description : Referred to as a ferrite device that can be used in lieu of a duplexer to isolate a microwave transmitter and receiver when both are connected to the same antenna. A. Isolator B. Circulator C. Coupler D. Diode.
Last Answer : B. Circulator
Description : The receive GCE system in an earth station performs what function(s)? A. Modulation and multiplexing B. Up conversion C. Demodulation and demultiplexing D. Down conversion
Last Answer : C. Demodulation and demultiplexing
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 : Which one is an antenna coupling unit? A. Coupler B. Diplexer C. Lecher wire D. Duplexer
Last Answer : B. Diplexer
Description : Not a reason for the use of an antenna coupler. A. To make the antenna look resistive B. To provide the output amplifier with the correct load impedance C. To discriminate against harmonics D. To prevent re-radiation of the local oscillator
Last Answer : D. To prevent re-radiation of the local oscillator
Description : A component that samples the microwave signal travelling in one direction down to the transmission line A. Isolator B. Combiner C. Directional coupler D. Attenuator
Last Answer : C. Directional coupler
Description : Best choice of transmission line component to couple a coaxial line to a parallel-wire line A. Shorting B. Balun C. Slotted line D. Directional coupler
Last Answer : B. Balun
Description : What is an opto-coupler IC?
Last Answer : Opto-coupler IC is a combined package of a photo-emitting device and a photosensing device.Examples for opto-coupler circuit : LED and a photo diode, LED and photo transistor, LED and Darlington. Examples for opto-coupler IC : MCT 2F , MCT 2E .
Description : Which among the following is correct characteristics about proxy server: a) A proxy server may act as a firewall by responding to input packets in the manner of an application while blocking other packets. b) A ... as a proxy on behalf of the network user; d) All of the Above e) None of These
Last Answer : d) All of the Above
Description : A machine that connects to two or more electronic mail systems and transfers mail messagesamong them is known as A. Gateways B. mail gateway C. bridges D. User Agent E. None of the above
Last Answer : mail gateway
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 : Gateway can interconnect LANs that have ____ protocols and formats. A. The same B. Different or the same C. Totally different D. None of these
Last Answer : C. Totally different
Description : A _________ interconnects LAN having identical protocols at the physical and data link layers. A. All of these B. bridge C. router D. Gateway
Last Answer : B. bridge
Description : A network router joins two _________ together? A. Computers B. Switches C. Networks D. Gateway
Last Answer : C. Networks
Description : To couple a coaxialline toa parallel-wire line,itisbesttouse a a. slotted line b.balun c. directional coupler d. quarter-wave transformer
Last Answer : b.balun
Description : What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard? a. 4 b. 2 c. 6 d. 3 3. none of the above
Last Answer : 3
Description : Which of the following technique isused for encapsulation? A. a technique used inbest-effort delivery systems toavoid endlessly loopingpackets. B. a technique used by protocols in which a lower level ... network that cannothandle the originaldatagram size D. All of theabove E. None of the above
Last Answer : a technique used by protocols in which a lower level protocol accepts a message from ahigher level protocol and places it in the data portion of the low level frame
Description : Which of the following technique isused for fragment? A. a technique used inbest-effort delivery systems toavoid endlessly loopingpackets B. a technique used by protocols in which a lower level protocol ... network that cannothandle the originaldatagram size D. All of theabove E. None of the above
Last Answer : one of the pieces that results when an IP gateway divides an IP datagram into smallerpieces for transmission acrossa network that cannothandle the originaldatagram size
Description : The address resolution protocol (ARP) is used for a. Finding the IP address from the DNS b. Finding the IP address of the default gateway c. Finding the IP address that corresponds to a MAC address d. Finding the MAC address that corresponds to an IP address
Last Answer : Finding the MAC address that corresponds to an IP address
Description : The examples of Interior Gateway Protocols (IGP) are. i) Open Short Path First (OSPF) ii) Routing Information Protocol (RIP) iii) Border Gateway Protocol (BGP) A) i only B) i, and ii only C) i and iii only D) All i, ii and iii
Last Answer : B) i, and ii only
Description : Open Short Path First (OSPF) ii) Routing Information Protocol (RIP) iii) Border Gateway Protocol (BGP) A) i only B) i, and ii only C) i and iii only D) All i, ii and iii
Description : 7.How does traceroute work? A. It uses an ICMP destination-unreachable message to elicit the name of a router. B. It sends a specially crafted IP packet to a router to locate the number of hops from ... the TTL value in an ICMP message to determine the number of hops from the sender to the router.
Last Answer : D. It uses the TTL value in an ICMP message to determine the number of hops from the sender to the router.
Description : Telnet is a : (1) browser (2) protocol (3) gateway (4) search engine
Last Answer : protocol
Description : What is the common up-converter and down-converter IF? A. 36 MHz B. 40 MHz C. 70 MHz D. 500 MHz
Last Answer : C. 70 MHz
Description : What is the common up-converter and down-converter IF for microwave communications? A. 60 MHz B. 80 MHz C. 120 MHz D. 70 MHz
Last Answer : D. 70 MHz
Description : What do you call a circuit that controls the magnetron output? A. Inverter B. Impeller C. Modulator D. Converter
Last Answer : C. Modulator
Description : Give the disadvantages of flash type A/D converter.
Last Answer : The simultaneous type A/D converter is not suitable for A/D conversion with more than 3 or 4 digital output bits. Then (2n-1)comparators are required for an n-bit A/D converter and the number of comparators required doubles for each added bit.
Description : What are the specifications of D/A converter?
Last Answer : The specifications are accuracy, offset voltage, monotonicity, resolution, and settling time.
Description : Explain in brief stability of a converter:
Last Answer : The performance of converter changes with temperature age & power supply variation . So all the relevant parameters such as offset, gain, linearity error & monotonicity must be specified over the full temperature & power supply ranges to have better stability performances.
Description : Define accuracy of converter.
Last Answer : Absolute accuracy: It is the maximum deviation between the actual converter output & the ideal converter output. Relative accuracy: It is the maximum deviation after gain & offset errors have been removed. ... of a converter is also specified in form of LSB increments or % of full scale voltage.
Description : Define resolution of a data converter.
Last Answer : The resolution of a converter is the smallest change in voltage which may be produced at the output or input of the converter. Resolution (in volts)= VFS/2n-1=1 LSB increment. The resolution of an ADC is defined as the smallest change in analog input for a one bit change at the output.
Description : What is integrating type converter?
Last Answer : An ADC converter that perform conversion in an indirect manner by first changing the analog I/P signal to a linear function of time or frequency and then to a digital code is known as integrating type A/D converter.
Description : Write down the drawback of weighted D/A converter.
Last Answer : The main disadvantage of binary weighted D/A converter is the requirement of wide range of resister values.As the length of the binary word is increased .the range of resister values needed also increases.
Description : What are the applications of V-I converter?
Last Answer : 1.Low voltage dc and ac voltmeter 2.L E D 3.Zener diode tester
Description : A/An ______network is typically a company network that connects multiple company locations into a single network. (A) local area (B) enterprise (C) campus wide (D) protocol.
Last Answer : (B) enterprise
Description : Which of the following is not a common application of fiber-optic cable? a. Computer networks b. Long-distance telephone systems c. Closed circuit TV d. Consumer TV
Last Answer : d. Consumer TV
Description : Data switching systems. A. improve the efficiency of data transfer B. are limited to small data networks C. required additional lines D. are not used in data system
Last Answer : A. improve the efficiency of data transfer
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 : It is a protocol used to connect the other packet witching network A. X.25 B. X.50 C. X.10 D. X.75
Last Answer : D. X.75
Description : Rules governing the transmission of digital information. A. Line protocol B. Isochronous C. Data communications D. Digital communications
Last Answer : B. Isochronous
Description : Asynchronous protocol is A. message oriented B. clock oriented C. bit oriented D. character oriented
Last Answer : D. character oriented
Description : ECE Board Exam March 1996 What is the IBM’s asynchronous data link protocol designation? A. 83 B B. 8A1 / 8B1 C. 93 B D. 9A1/ 9B1
Last Answer : A. 83 B
Description : The standard suit of protocols used by the Internet, Intranets, extranets and some other networks. A) TCP/IP B) Protocol C) Open system D) Internet work processor
Last Answer : A) TCP/IP
Description : The Aloha protocol is an OSI _______ protocol for LAN networks with broadcast topology A. layer 1 B. layer 4 C. layer 2 D. layer 3
Last Answer : C. layer 2
Description : The standard suit of protocols used by the Internet, Intranets, extranets andsome other networks. A) TCP/IP B) Protocol C) Open system D) Internet work processor
Description : SNMP stands for a) Simple Networks Messaging Protocol b) Simple Networks Mailing Protocol c) Simple Networks Management Protocol d) Simple Networks Master Protocol
Last Answer : c) Simple Networks Management Protocol