16. A fax transmission is usually at a _______ mode.
(a) simplex
(b) half-duplex
(c) full duplex
(d) multiplex
17. The sampling period for telephone signals.
(a) 8000 Hz.
(b) 125 μsec.
(c) 6400 Hz.
(d) 100 mu;sec.
18. What part of the conventional telephone set the transmitter and receiver unit are located ?
(a) dial
(b) base
(c) keypad
(d) handset
19. The type of receiver widely used in the conventional telephone set.
(a) electromagnetic
(b) ceramic
(c) carbon
(d) piezoelectric
20. The signal heard on the telephone line which indicates that the called subscriber set is in use.
(a) dial tone
(b) ringing tone
(c) busy tone
(d) congestion tone
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