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ECE Objective Questions { Digital Communication System }



50. The use of non-uniform quantization leads to
A. reduction in transmission bandwidth
B. increase in maximum SNR
C. increase in SNR for signal levels
D. simplification of quantization process.

51. In pulse modulation, the number of samples required to ensure no loss of information is given by
A. Nyquist theorem
B. Parsevals theorem
C. Fourier transform
D. None of the above

52. Pulse amplitude modulation is a process whereby
A. the position ofthe pulse is changed as a function of the sampled value
B. the width of the pulse is varied as a function of time
C. the height of a pulse is made proportional to the sampled value
D. None of the above

53. Which of the following is restriction imposed on the reconstruction of a sampled signal?
A. Impulses must be passed through a high pass filter
B. Impulses must be passed through a band pass filter
C. The sampling rate must be in the form of impulses
D. None of the above

54. Pulse width of modulation is a process whereby
A. the position of a pulse is changed as a function of the sampled value
B. the sampled value is first coded and then transmitted
C. the width of a pulse is varicd as a function of the sampled value
D. None of the above

55. The signal-to-noise (S/N) ratio appearing at the output of each channel in PAM is
A. three times the input S/N
B. one-and-half times the input S/N
C. twice the input S/N
D. None of the above

56. A PWM signal can be generated by
A. a monostable multi-vibrator
B. a astable multi-vibrator
C. integrating the PPM signal
D. differentiating the PPM signal

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