1. A percentage of modulation greater than 100% 10% 25% 50% 2. How is the performance of SSB AM systems in fading channels? poor good average best 3. FFSR in AM systems stands for feedforward system restoration feedbackward system restoration feedforward signal regeneration feedbackward signal regeneration 4. Which of the following stage is present in FM receiver but not in AM receiver? demodulator am amplifier amplitude limiter mixer 5. Which of the following is a disadvantage of tone-in-band SSB system? effects of multipath bad adjacent channel protection generation and reception of signal is complicated high bandwidth 6. When noise is passed through a narrow band filter, the output of filter should be? parabolic square triangular sinusoidal 7. AM demodulation technique can be divided into and demodulation. coherent, noncoherent quadrature detection, coherent detection direct, indirect slope detector, zero crossing 8. What do you understand by the term 'carrier' in modulation? voltage to be transmitted resultant wave voltage for which amplitude, phase or frequency can be varied voltage for which amplitude, phase or frequency remains constant 9. Which is the greatest disadvantage of Pulse Code Modulation? highly prone to noise cannot travel long distances large bandwidth is required for it its inability to handle analog signals 10. In AM pilot carrier, transmission has two side bands two side bands and a carrier carrier and part of one side band carrier, one side band and part of other side band 11. What is the use of Companding? to overcome quantizing noise in pcm in pcm receiver to overcome impulse noise to protect small signals in pcm from quantizing distortion in pcm transmitters to allow amplitude limiting in the receivers 12. For a low level AM system, amplifier modulated stage must have linear devices class a amplifiers non-linear devices harmonic devices 13. Which of the following is not an advantage of digital modulation? less bandwidth requirement greater noise immunity easier multiplexing greater security 14. In digital communication system, in order to increase noise immunity, it is necessary to increase signal power signal amplitude signal frequency signal magnitude 15. The performance of modulation scheme is not measured in terms of power efficiency bandwidth efficiency transmitted power cost and complexity 16. In angle modulation, signal to noise ratio before detection is a function of input signal to noise ratio maximum frequency of the message if filter bandwidth modulation index 17. Which of the following is the ratio of the throughput data rate per Hertz? power density spectral density bandwidth efficiency power efficiency 18. is equal to width of main spectral lobe. 3 db bandwidth half power bandwidth absolute bandwidth null to null bandwidth 19. Which of the following are two methods for generating FM signal? product detector, envelope detector direct method, indirect method coherent method, noncoherent method slope detector, zero crossing detector 20. Which of the following is not necessarily an advantage of FM over AM? carrier is of any shape less modulating power is required better noise immunity is provided higher bandwidth is required 21. The antenna current is 10A. Find the percentage of modulation when the antenna current increases to 10.4A? 50% 23% 28.50% 30% 22. Which conveys more information? high & low probability event high probability event none of the mentioned low probability event 23. The output of an information source is none of the mentioned deterministic random & deterministic random 24. In a delta modulation system, granular noise occurs when the pulse amplitude decreases pulse rate decreases modulating signal remains constant modulating signal increases rapidly 25. Coherent demodulation of FSK signal can be performed using bpf and envelope detectors none of the mentioned discriminator matched filter 26. When pulse code modulation is applied to non binary symbols we obtain waveform called as pcm line codes m-ary pam 27. In which waveform logic 1 and logic 0 are represented by opposite one half bit wide pulses? unipolar rz manchester coding rz-ami bipolar rz 28. Which method is preferred in magnetic tape recording? nrz-s nrz-m none of the mentioned nrz-l 29. The signals which are obtained by encoding each quantized signal into a digital word is called as sampling and quantization pcm signal fm signal pam signal 30. In PCM encoding, quantization level varies as a function of square of frequency square of amplitude amplitude frequency 31. Sample resolution for LPCM bits per sample. all of the mentioned 24 8 16 32. The return to zero waveform consists of unipolar rz rz-ami bipolar rz all of the mentioned 33. is often called the formant of the speech signal. pole frequency central frequency pitch frequency voice pitch 34. The real part of an antenna's input impedance is due to reflected signal swr radiated signal refracted signal 35. QPSK provides twice the bandwidth efficiency and energy efficiency as compared to BPSK. same four times twice half 36. ASCII code is a variable length code none of the mentioned fixed length code fixed & variable length code 37. Coherent PSK and non coherent orthogonal FSK have a difference of in PB. 6db 4db 3db 1db 38. Self information should be negative positive positive & negative none of the mentioned 39. The self information of random variable is 1 0 infinite cannot be determined 40. A rate distortion function is a none of the mentioned increasing function convex function concave function 41. Which of the following is not a detection technique used for detection of ?/4 QPSK signals? baseband differential detection envelope detection if differential detection fm discriminator detection Submit Answers Retake Test More Computer Science Engineering Study Material › Computer Science Engineering Mock Tests with Answers Distributed Computing System Mock Test Software Project Management Mock TestArtificial Intelligence and Robotics Mock TestBasics of Database Management Mock TestC# Programming Mock TestC#.NET Programming Mock TestCloud Computing Mock TestCommunication Network Mock TestComputer Architecture Mock TestComputer Architecture and Organization Mock TestComputer Fundamentals Mock TestComputer Networking Mock TestComputer Networks Mock TestCPP Programming Mock TestData Analysis Mock TestData Communication and Computer Network Mock TestData Compression and Data Retrieval Mock TestData Mining and Business Intelligence Mock TestData Mining and Data Warehouse Mock TestData Structure and Algorithms Mock TestData Structures Mock TestDataBase Management System Mock TestDesign and Analysis of Algorithms Mock TestDigital Electronics and Logic Design Mock TestDigital Logic Circuits Mock TestDigital Principles and System Design Mock TestDiscrete Mathematics Mock TestDiscrete Structure Mock TestDotNet Technology Mock TestEmbedded Real Time Operating System Mock TestGreen Computing Mock TestHigh Performance Computing Mock TestInformation Cyber Security Mock TestInformation and Network Security Mock TestInformation Retrival Techniques Mock TestInformation Systems and Engineering Economics Mock TestMachine Learning Mock TestMicroprocessor and Interfacing Technique Mock TestMicroprocessors Mock TestMuli core Architectures and Pro Mock TestMulti core processors Mock TestNetwork Security Mock TestNeural Networks and Fuzzy Control Object Oriented Programming Mock TestOperating System Architecture Mock TestOperating System Mock TestProblem Solving and Python Programming Mock TestProgramming for Problem Solving Mock TestPython Programming Mock TestSoft Computing Mock TestSoftware Design Modeling Mock TestSoftware Engineering Mock TestSoftware Testing Mock TestSoftware Testing and Quality Assurance Mock TestTheory of Computation and Compiler Design Mock TestTheory of Computation Mock TestUbiquitous Computing System Mock Test Computer Science Engineering Mock Tests