6. Which of the following modulating system is inherently most noise-resistant ?
(a) PCM
(b) PPM
(c) FM
(d) DSB
7. Which of the following pulse modulating system analog ?
(a) PCM
(b) PWM
(c) Both a and b
(d) None of the above
8. For transmission of normal speech signal, the PCM channels needs bandwidth of :
(a) 64 kHz
(b) 8 kHz
(c) 4 kHz
(d) 2 kHz
9. The main advantage of PCM system is :
(a) Lower bandwidth
(b) Lower power
(c) Lower noise
(d) None of the above
10. The quantisation noise, in a PCM system, depends on :
(a) The sampling rate only
(b) The number of quantisation levels only
(c) Both the sampling rate and the number of quantisation levels
(d) None of the above
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