This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Cipher Systems and secrecy of cipher systems”. 1. Cryptosystems are used for a) Privacy b) Authentication c) Privacy & Authentication d) None of the mentioned 2. The key also contains a a) Plaintext b) Ciphertext c) Plaintext & Ciphertext d) None of … Read more
This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Cellular systems”. 1. In the case of direct CDMA, interference will occur if the PN codes are a) Orthogonal to each other b) Non orthogonal to each other c) Orthogonal & Non orthogonal to each other d) None of the mentioned 2. … Read more
This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Acquisition and Tracking”. 1. Acquisition is a process of bringing two spreading signals into _______ alignment. a) Fine b) Coarse c) Fine & Coarse d) None of the mentioned 2. Tracking maintains the possible waveform ______ alignment using a feedback loop. a) … Read more
This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Direct sequence and frequency hopping”. 1. DS/BPSK includes a) Despreading b) Demodulation c) Despreading & Demodulation d) None of the mentioned 2. In direct sequence process which step is performed first? a) De-spreading b) Demodulation c) Despreading & Demodulation d) None of … Read more
This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Pseudo-noise sequence and jamming”. 1. Pseudorandom signal ________ predicted. a) Can be b) Cannot be c) maybe d) None of the mentioned 2. The properties used for pseudorandom sequence are a) Balance b) Run c) Correlation d) All of the mentioned 3. … Read more
This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Spread spectrum and CDMA”. 1. Some advantages of spread spectrum are a) Low susceptibility b) Immunity to jamming c) Reduced interference d) All of the mentioned 2. Processing gain is the ratio of message bandwidth to signal bandwidth. a) True b) False … Read more
This set of Digital Communication Questions for campus interviews focuses on “TDM vs FDM”. 1. Companding is used to a) Increase the information transmission rate b) Use only one carrier frequency to handle different signals c) To use different frequency bands for different signals d) To protect all small signals in PCM from quantizing noise … Read more
This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “TDM and FDM”. 1. Which is based on orthogonality? a) TDM b) FDM c) TDM & FDM d) None of the mentioned 2. Which provides constant delay? a) Synchronous TDM b) Non synchronous TDM c) Synchronous & Non synchronous TDM d) None … Read more
This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “INTELSAT”. 1. INTELSAT II and III operates their TWTA in a) Saturation region b) Linear region c) Hard limiting region d) None of the mentioned 2. As the number of carriers, the capacity of the transponder a) Increases b) Decreases c) Remains … Read more
This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Multiple access techniques for LAN and access algorithms”. 1. A local area network can be used to interconnect a) Computers b) Terminals c) Printers d) All of the mentioned 2. LAN uses _________ cables. a) Low bandwidth b) High bandwidth c) Low … Read more
