A certain amount of side tone is essential in telephone communication (A) TRUE (B) FALSE

A certain amount of side tone is essential in telephone communication
(A) TRUE (B) FALSE
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Ans: (A)
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In a hundred-line exchange 24 two-motion selectors are used. Draw the schematic you suggest for this exchange and explain its working. How many simultaneous calls can be made during peak hour in this exchange?

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Explain the following terms: progressive control, common control and stored program control.

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