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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