11. PABX stands for :
(a) Private All-purpose Broadcasting Exchange
(b) Private Automatic Branch Exchange
(c) Public Access Bidirectional Exchange
(d) Public Address Broadcasting Exchange
12. A trunk is :
(a) the base of a communication tower
(b) a telephone line connecting two C.O.’s
(c) a line connecting one telephone set to the PABX
(d) the structure where antenna are attached
13. The voice frequency channel pass band is :
(a) 0 to 4000 Hz
(b) 300 to 3000 Hz
(c) to carry only speech
(d) all of the preceding
14. The telephone was invented by :
(a) James Watson
(b) Alexander Graham Bell
(c) Philip Reis
(d) Almon Strowger
15. A telephone switch is an example of ____ switching.
(a) packet
(b) message
(c) circuit
(d) virtual circuit
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.