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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
Answer : (d)

Explanation
No answer description available for this question. Let us discuss.

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
Answer : (b)

Explanation
No answer description available for this question. Let us discuss.

8. The primary cause of echo and singing is :

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

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

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
Answer : (a)

Explanation
No answer description available for this question. Let us discuss.

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

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

Answer
Answer : (a)

Explanation
No answer description available for this question. Let us discuss.

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