1. In Pulse transmitter the ratio of time on to time off is called :
(a) Efficiency
(b) Duty cycle
(c) Base
(d) Bandwidth
2. PCM transmission requires _______ Bandwidth than Amplitude transmission.
(a) More
(b) Less
(c) Same
(d) Negligible
3. Which one of the following communication system is digital ?
(a) FM
(b) AM
(c) PCM
(d) PAM
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