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This set of Communication Engineering Multiple Choice Questions & Answers (MCQs) focuses on Communication Engineering Set 4

Q1 | If the channel is noiseless information conveyed is        and if it is useless channel information conveyed is        
  • 0,0
  • 1,1
  • 0,1
  • 1,0
Q2 | The mutual information between a pair of events is
  • positive
  • negative
  • zero
  • all of the mentioned
Q3 | 2 QUANTIZATION
  • true
  • false
Q4 | The output of an information source is
  • random
  • deterministic
  • random & deterministic
  • none of the mentioned
Q5 | When the base of the logarithm is e, the unit of measure of information is
  • bits
  • bytes
  • nats
  • none of the mentioned
Q6 | Flat top sampling of low pass signals
  • gives rise to aperture effect
  • implies over sampling
  • leads to aliasing
  • introduces delay distortion
Q7 | In a delta modulation system, granular noise occurs when the
  • modulating signal increases rapidly
  • pulse rate decreases
  • pulse amplitude decreases
  • modulating signal remains constant
Q8 | A PAM signal can be detected using
  • low pass filter
  • high pass filter
  • band pass filter
  • all pass filter
Q9 | Coherent demodulation of FSK signal can be performed using
  • matched filter
  • bpf and envelope detectors
  • discriminator
  • none of the mentioned
Q10 | The use of non uniform quantization leads to
  • reduction in transmission bandwidth
  • increase in maximum snr
  • increase in snr for low level signals
  • simplification of quantization process
Q11 | A PWM signal can be generated by
  • an astable multi vibrator
  • a monostable multi vibrator
  • integrating a ppm signal
  • differentiating a ppm signal
Q12 | TDM is less immune to cross-talk in channel than FDM.
  • true
  • false
Q13 | In an ideal TDM system, the cross correlation between two users of the system is
  • 1
  • 0
  • infinity
  • -1
Q14 | TDM requires
  • constant data transmission
  • transmission of data samples
  • transmission of data at random
  • transmission of data of only one measured
Q15 | Which waveforms are also called as line codes?
  • pcm
  • pam
  • fm
  • am
Q16 | When pulse code modulation is applied to non binary symbols we obtain waveform called as
  • pcm
  • pam
  • m-ary
  • line codes
Q17 | Examples of PCM waveforms are
  • non return to zero
  • phase encoded
  • multilevel binary
  • all of the mentioned
Q18 | Which type is used and preferred in digital logic circuits?
  • nrz-l
  • nrz-m
  • nrz-s
  • none of the mentioned
Q19 | Which method is called as differential encoding?
  • nrz-l
  • nrz-m
  • nrz-s
  • none of the mentioned
Q20 | Which method is preferred in magnetic tape recording?
  • nrz-l
  • nrz-m
  • nrz-s
  • none of the mentioned
Q21 | NRZ-S is complement of                
  • nrz-l
  • nrz-m
  • nrz-l & nrz-m
  • none of the mentioned
Q22 | The return to zero waveform consists of
  • unipolar rz
  • bipolar rz
  • rz-ami
  • all of the mentioned
Q23 | Phase encoded group consists of
  • manchester coding
  • bi-phase-mark
  • miller coding
  • all of the mentioned
Q24 | In which waveform logic 1 is represented by half bit wide pulse and logic 0 is represented by absence of pulse?
  • unipolar rz
  • bipolar rz
  • rz-ami
  • manchester coding
Q25 | In which waveform logic 1 and logic 0 are represented by opposite one half bit wide pulses?
  • unipolar rz
  • bipolar rz
  • rz-ami
  • manchester coding