6. The following are the transmission media used for telephone systems except :
(a) parallel wire
(b) coaxial cable
(c) fiber optics
(d) NOTA
7. A method of multiplexing in which the total frequency spectrum available is used by each channel, but only for part of the time.
(a) FDM
(b) TDM
(c) SDM
(d) GSM
8. The primary cause of echo and singing is :
(a) intermodulation noise
(b) crosstalk
(c) impedance mismatch
(d) thermal noise
9. The signal to noise ratio for voice based on customer satisfaction is :
(a) 30 dB
(b) 45 dB
(c) 15 dB
(d) 20 dB
10. In telephony, tone dialing takes _________ time than pulse dialing.
(a) less
(b) more
(c) about the same
(d) canrsquo;t be determined
Related Posts
Telephone Engineering » Exercise - 120. 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- Telephone Engineering » Exercise - 110. In telephony, tone dialing takes _________ time than pulse dialing. (a) less (b) more (c) about the same (d) can’t be determined
- Telephone Engineering » Exercise - 1 1. A condition of a telephone handset, in which it can be called, is _______ condition. (a) on-hook (b) off-hook (c) busy (d) none of these
- Telephone Engineering » Exercise - 13. That part of the telephone network between the telephone instrument at the subscriber premises and the central office equipment is called the __________. (a) Inter-office trunk (b) Tie Line (c) Subscriber loop (d) Service drop wire
- Telephone Engineering » Exercise - 117. The sampling period for telephone signals. (a) 8000 Hz. (b) 125 μsec. (c) 6400 Hz. (d) 100 μsec.