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Question :
a) Describe the following modes of wave propagation:
- Line of sight - Ground waves - Skywaves
b) Why can waves with a very low frequency be used for submarine communication? Give one reason why are they not used for data transmission in mobile phones and computer networks.
c) A Line-of-sight (LOS) is usually required between a sender and receiver for radio waves with frequency > 30 MHz, nevertheless, mobile phones can work in big cities without such LOS. Explain.
d) Spread spectrum is a technique which generates signals which are strong and loud, that is resistant to interference. Explain how this is achieved.
e) Briefly explain how directional and omni-direction antennas work. Is a directional antenna suitable for mobile phone communication?
Distinguish between enhancement mode and depletion mode metal oxide semiconductor field effect transistors giving their characteristics. Ans. Enhancement mode and depleti
how to draw dfd on this??
THE DIFFERENCE ENGINE - Pascaline The difference enigne was based on the mathematical principle of finite differences and was used to solve calculations based on large numbers
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Program Level This is normally the liability of OS (operating system) that runs processes simultaneously. Different programs are generally independent of each other. So paralle
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Neural architectures are appealing as mechanisms for implementing intelligence for a number of reasons. Traditional AI programs tend to be brittle and overly sensitive to noise
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