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ECE Objective Questions { Digital Communication System }



36. A PAM signal can be demodulated using
A. a low pass filter
B. a band pass filter
C. a high pass filter
D. none of the above

37. In time-division-multiplexing, each multiplexed signal occupies
A. the entire transmission bandwidth
B. a fraction of the transmission bandwidth
C. a bandwidth equal to the bandwidth of each input signal
D. none of above

38. The signal propagation time between two ground stations in a synchronous satellite link is about millisecond.
A.50
B.135
C.270
D.300

39. Pulse modulation is used in
A. Radio navigation
B. Automatic landing equipments
C.Data communications
D. All of the above

40. In pulse transmitter theratio of time on to time off is called
A. efficiency
B. duty cycle
C. base
D. bandwidth

41. Quantization noise occurs in
A. PCM
B. TDM
C.FDM
D. PWD

42. Which of the following modulating system is inherently most noise-resistant?
A. PCM
B. PPM
C. FM
D.DSB

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