12.
Terminals are required for

14.
Business meeting and conferences can be held by linking distantly located people through a computer network. Not only the participants exchange information but are able to see each other. What is it called?

15.
What frequency range is used for microwave communications, satellite and radar?

16.
Which of the following statements is incorrect?

18.
A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. If Delta modulation is selected, then how many bits per second are actually sent?

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