Electronics Communication Interview Questions

Electronics Communication Interview Questions
1)What is packet switching and circuit switching? What is the protocol used in telephone network?
2)What is modulation? Why is needed? What are the various types?Compare AM,FM, PM.Which waves will travel a longer distance- FM or AM and why?
3)What is the mode of transmission of television signals?
4)Compare the bandwidth requirements of AM and FM
5)What do you know about antennae?
6)Why is linking up frequency greater than the down linking frequency?

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