Quiz in Wire and Wireless Communications System
Question 501. He designed and built the first transmitter and receiver for a telephone set.
Question 502. What tones carry map information using facsimile?
Question 503. A signalling technique wherein a number of voice paths is carried over one common channel instead of having individual voice channels.
Question 504. For crosstalk to be considered intelligible, at least ________ words are intelligible to the listener in a seven second period.
Question 505. What is used to transmit more than one conversation over a path?
Question 506. The signal heard on the telephone line that indicates readiness of the central office in receiving address or telephone number.
Question 507. dBa is a noise unit which uses a tone of 1000 Hz and a power level of
Question 508. By definition, speech power is equal to v.u. reading minus 1.4 dB plus log of N, where N is
Question 509. That part of the telephone network between the telephone instrument at the subscriber premises and the central office equipment is called the _______________.
Question 510. A recorder helix in facsimile?