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MCQ

The signal to noise ratio for a voice grade line is 30.1 dB (decibels) or a power ratio of 1023:1. The maximum achievable data rate on this line whose spectrum ranges from 300 Hz to 4300 Hz is

6200 bps

9600 bps

34000 bps

31000 bps

None of the above

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The amount of uncertainty in a system of symbol is called

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How many Character per sec(7bits + 1parity) can be transmitted over a 2400 bps line if the transfer is synchronous (1 "Start" and 1 "stop" bit)?

300

240

250

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The difference between a multiplexer and a statistical multiplexer is

Statistical multiplexers need buffers while multiplexers do not need buffers

Multiplexer use X.25 protocol, while statistical multiplexers use the Aloha protocol

Multiplexers often waste the output link capacity while statistical multiplexers optimize its use

Multiplexers use Time Division Multiplexing (TDM) while statistical multiplexers use Frequency Division Multiplexing (FDM)

None of the above

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Which of the following statement is correct?

Teleprinters are used for printing at remote locations, not for input.

Teleprinters are same as teletypes

Teleprinters are same as x400

Teleprinters have a printer for output and keyboard for input

None of the above

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How much power (roughly) a light-emitting diode can couple into an optical fiber?

100 microwatts

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100 picowatts

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None of the above

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