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Telephone Engineering – 1 – 3

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

14. The telephone was invented by :

(a) James Watson
(b) Alexander Graham Bell
(c) Philip Reis
(d) Almon Strowger

ANSWER

EXPLANATION

15. A telephone switch is an example of ____ switching.

(a) packet
(b) message
(c) circuit
(d) virtual circuit

ANSWER

EXPLANATION

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