26. The telephone channels in a communication satellite are assembled in :
(a) FM
(b) AM
(c) TDM
(d) FDM
27. In transmission analog signals may be converted in digital form using :
(a) Modem
(b) Transponder
(c) Compander
(d) Codec
28. Which of the following is the most effective antijamming technique ?
(a) Key leverage
(b) Frequency
(c) Once-only key
(d) Spread-spectrum modulation
29. Radio broadcasting is a familiar example of ……. Multiplexing .
(a) Frequency
(b) Time
(c) Space
(d) None of the above
30. The carrier frequency component of an amplitude-modulated signal contains no information but is of ….. amplitude than the side band.
(a) Smaller
(b) Greater
(c) Either of the above
(d) None of the above
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