Description : A communication device that combines transmissions from several I/O devices into one line is a A) Concentrator B) Modifier C) Multiplexer D) Full duplex file
Last Answer : C) Multiplexer
Description : A communications device that combines transmissions from several I/O devices into one line is a a. concentrator b. modifier c. multiplexer d. full-duplex line
Last Answer : multiplexer
Description : Which of the following does not allow multiple uses or devices to share one communication line? a. doubleplexer b. multiplexer c. concentrator d. controller
Last Answer : concentrator
Description : A multiplexer combines four 100-Kbps channels using a time slot of 2 bits. What is the bit rate? (A) 100 Kbps (B) 200 Kbps (C) 400 kbps (D) 1000 Kbps
Last Answer : (C) 400 kbps
Description : Which of the following statement is incorrect? a. The difference between synchronous and asynchronous transmission is the clocking derived from the data in synchronous transmission. b. Half ... in online activities d. Batch processing is the prefered processing mode for telecommunication operation.
Last Answer : Batch processing is the prefered processing mode for telecommunication operation.
Description : Which of the communication modes support two way traffic but in only once direction of a time? A) Simplex B) Half-duplex C) Three - quarter's duplex D) Full duplex
Last Answer : B) Half-duplex
Description : Which of the following might be used by a company to satisfy its growing communications needs? a. front end processor b. multiplexer c. controller d. concentrator e. all of the above
Last Answer : all of the above
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 : A terminal multiplexer has six 1200 bps terminals and ‘n’ 300 bps terminals connected to it. If the outgoing line is 9600 bps, what is the value of n ? (A) 4 (B) 8 (C) 16 (D) 28
Last Answer : (B) 8
Description : Which of the following is not the function of Microkernel? A) File management B) Low-level memory management C) Inter-process communication D) I/O interrupts management
Last Answer : A) File management
Description : Which of the following is a sequential circuit? (A) Multiplexer (B) Decoder (C) Counter (D) Full adder
Last Answer : (C) Counter
Description : Which of the following does not allow multiple users or devices toshare onecommunications line? A. doubleplexer B. multipplexer C. concentrator D. controller E. None of the above
Last Answer : doubleplexer
Description : What is a modifier?
Last Answer : A: A modifier is a keyword placed in a class, method or variable declaration that changes how it operates. Examples of modifiers are: abstract, final, static etc.
Description : Binary symmetric channel uses (A) Half duplex protocol (B) Full duplex protocol (C) Bit oriented protocol (D) None of the above
Last Answer : (A) Half duplex protocol
Description : HDLC isan acronym for _______. A) High-duplex line communication B) High-leveldata link control C) Half-duplex digital link combination D) Hostdouble-level circuit
Last Answer : High-leveldata link control
Description : Devices on one network can communicate with devices on another network via a ....... A) File Server B) Utility Server C) Printer Server D) Gateway
Last Answer : D) Gateway
Description : In a ................topology, if there are n devices in a network, each device has n-1 ports for cables. A) Mesh B) Star C) Bus D) Ring
Last Answer : A) Mesh
Description : Data flow between two devices canoccur in a _______ way. A) simplex B) half-duplex C) full-duplex D) all of theabove
Last Answer : all of theabove
Description : The transmission mode which allows both communicating devices to transmit and receive data simultaneously is: a) Full Duplex b) Simplex c) Half Duplex d) Simple Complex e) None of These
Last Answer : a) Full Duplex
Description : The essential difference between traps and interrupts is (A) traps are asynchronous and interrupts are synchronous with the program (B) traps are synchronous and interrupts are asynchronous with the program ( ... synchronous and interrupts are asynchronous with the I/O devices. (D) None of these.
Last Answer : (B) traps are synchronous and interrupts are asynchronous with the program
Description : One of the main features that distinguish microprocessor from microcomputers is (A) words are usually larger in microprocessors. (B) words are shorter in microprocessors. (C) microprocessor does not contain I/O devices. (D) None of the above.
Last Answer : (C) microprocessor does not contain I/O devices.
Description : The distributed system is a collection of (P) and communication is achieved in distributed system by (Q) , where (P) and (Q) are : (A) Loosely coupled hardware on tightly ... message passing ,respectively. (D) Loosely coupled software on tightly coupled hardware and file sharing, respectively.
Last Answer : (C) Tightly coupled software on loosely coupled hardware and message passing ,respectively.
Description : The device that converts digital signals to analog signals at the start of long distance transmissions is (1) peripheral (2) modem (3) telephone (4) antenna
Last Answer : modem
Description : In mode, the communication channel is used in both directions at the same time? A) Full-duplex B) Simplex C) Half-duplex D) None of the above
Last Answer : Answer : A
Description : Which data communication method is used to transmit the data over a serial communication link? a. simplex b. half-duplex c. full-duplex d. b and c e. None of above
Last Answer : full-duplex
Description : Communication between acomputer and a keyboardinvolves______________ transmission. A) simplex B) half-duplex C) full-duplex D) automatic
Last Answer : simplex
Description : Which mode of Communication occurs between a computer and a keyboard. a. Automatic b. Half-duplex c. Full-duplex d. Simplex
Last Answer : d. Simplex
Description : A communication between a computer and a keyboard involves ____________ transmission. a) simplex b) half duplex c) full duplex d) semi-duplex
Last Answer : a) simplex
Description : Compare between simplex and full duplex communication on the basis of: 1) Definition 2) Sketch
Last Answer : Compare between simplex and full duplex communication on the basis of: 1) Definition 2) Sketch
Description : Which of the following statements is true? (A) Smart cards do not require an operating system. (B) Smart cards and PCs use some operating system. (C) COS is smart card operating system. (D) The communication between reader and card is in full duplex mode.
Last Answer : (C) COS is smart card operating system
Description : ........... is a large kernel, including scheduling file system, networking, device drivers, memory management and more. A) Monolithic kernel B) Micro kernel C) Macro kernel D) Mini kernel
Last Answer : A) Monolithic kernel
Description : ........... is a large kernel containing virtually the complete operating system, including, scheduling, file system, device drivers and memory management. A) Multilithic kernel B) Monolithic kernel C) Micro kernel D) Macro kernel
Last Answer : B) Monolithic kernel
Description : A unix file may be of type: (A) Regular file (B) Directory File (C) Device File (D) Any one of the above
Last Answer : (D) Any one of the above
Description : In Unix operating system, special files are used to : (A) buffer data received in its input from where a process reads (B) provide a mechanism to map physical device to file names (C ... pointers associated with i-nodes (D) store information entered by a user application program or utility program
Last Answer : (B) provide a mechanism to map physical device to file names
Description : A device is sending out data at the rate of 2000 bps. How long does it take to send a file of 1,00,000 characters ? (A) 50 (B) 200 (C) 400 (D) 800
Last Answer : (C) 400 Explanation: 1,00,000 characters = 1,00,000 x 8 bits = 8,00,000 bits 8,00,000 bits/2000 bps = 400 seconds
Description : The different types of tables maintained by the operating system are ............. A) memory, logical , I/O file B) memory, I/O, file, physical C) memory, I/O, file, process D) memory, logical, I/O, physical
Last Answer : C) memory, I/O, file, process
Description : In RISC architecture access to registers is made as a block and register file in a particular register can be selected by using: a. Multiplexer b. Decoder c. Subtractor d. Adder
Last Answer : b. Decoder
Description : Multiplexing in a time division multiplexer occurs based upon A. the position of a frame within the group of frames B. the positioning of data within a frame C. the priority assigned to a connected device D. the activity of a connected device
Last Answer : B. the positioning of data within a frame
Description : An STS multiplexer is a ______ device. A) one-layer B) two-layer C) three-layer D) four-layer
Last Answer : two-layer
Description : A device which converts BCD to Seven Segment is called (A) Encoder (B) Decoder (C) Multiplexer (D) Demultiplexer
Last Answer : Ans: B A device which converts BCD to Seven Segment is called DECODER. (A decoder coverts binary words into alphanumeric characters.)
Description : The device which changes from serial data to parallel data is (A) COUNTER (B) MULTIPLEXER (C) DEMULTIPLEXER (D) FLIP-FLOP
Last Answer : Ans: C The device which changes from serial data to parallel data is demultiplexer. (A demultiplexer takes in data from one line and directs it to any of its N outputs depending on the status of the select inputs.)
Description : Which of the following communication modes support two-way traffic but in only one direction at a time? a. simplex b. half duplex c. three-quarters duplex d. all of the above e. none of the above
Last Answer : half duplex
Description : The communication modethat supports two-way traffic but only one direction at atime is A. simplex B. duplex C. half duplex D. multiplex E. None of the above
Description : Computer to computer communication is: (A) Simplex (B) Duplex (C) Half Duplex (D) Both Duplex and Half Duplex
Last Answer : (B) Duplex
Description : _____ is a bi-directional, fully duplex communication model that uses a persistent connection between client and server. A. Request-Response B. Publish-Subscriber C. Push-Pull D. Exclusive Pair
Last Answer : D. Exclusive Pair
Description : Compare between simplex and duplex communication
Last Answer : simplex and duplex communication :
Description : A 400 W carrier is amplitude modulated to a depth of 75%.Calculate the total power in AM wave. (i) Explain the types of noise in a communication system. (ii) Compare simplex and duplex mode of communication.
Last Answer : (i) Noise: Noise is any spurious or undesired disturbances that mask the received signal in a communication system. a) Atmospheric Noise: Atmospheric Noise is also known as static noise which is the ... remote control ExamplesWalkytalky,telephone,mobile,Radar, FAX,Pager 4