Telephone Engineering – 1 – 2

6. The following are the transmission media used for telephone systems except :

(a) parallel wire
(b) coaxial cable
(c) fiber optics
(d) NOTA

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

8. The primary cause of echo and singing is :

(a) intermodulation noise
(b) crosstalk
(c) impedance mismatch
(d) thermal noise

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

10. In telephony, tone dialing takes _________ time than pulse dialing.

(a) less
(b) more
(c) about the same
(d) can’t be determined

ANSWER

EXPLANATION

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