Which among the following types of channels moves data relatively slowly?
Answer: C
Correct answer: narrow band channel
A narrowband channel carries the least data per second, being defined by its small range of frequencies; voice-band channels are the next step up and wideband channels the fastest.
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A communications device that combines transmissions from several I/O devices into one line is a
Answer: C
Correct answer: multiplexer
A multiplexer combines several input streams onto one line and separates them again at the far end. A concentrator also shares a line but buffers and forwards rather than dividing it into fixed channels.
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In a synchronous modem, the digital-to-analog converter transmits signal to the
Answer: A
Correct answer: equilizer
In a synchronous modem the digital-to-analog converter's output goes to the equalizer, which compensates for the distortion the telephone line will impose before the signal is put on the line.
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Which among the following communications lines is best suited to interactive processing applications?
Answer: C
Correct answer: full duplex lines
Interactive work means a rapid exchange in both directions, and a full duplex line carries both at once so neither side waits for the line to turn round. A simplex line carries one direction only.
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Which amogn the following is considered a broad band communication channel?
Answer: D
Correct answer: all of above
Broadband means a channel of wide bandwidth, and coaxial cable, optical fibre and microwave links all qualify - each carries far more than a single voice channel.
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Which among the following is not a transmission medium?
Answer: C
Correct answer: modem
Telephone lines, coaxial cable and microwave systems all carry the signal, so each is a transmission medium. A modem is equipment at the end of the medium, converting the signal so it can travel.
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Which among the following does not allow multiple uses or devices to share one communication line?
Answer: A
Correct answer: doubleplexer
Multiplexers, concentrators and controllers all let several devices share one line. Doubleplexer is not a device at all, which is what makes it the answer.
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Which among the following signal is not standard RS-232-C signal?
Answer: A
Correct answer: VDR
RTS, CTS and DSR are all RS-232-C control signals - request to send, clear to send and data set ready. VDR is not among the standard's signals.
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