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Question 1
(a) Describe the functions of the modulator and source encoder in a digital communications system.
(b) By using appropriate examples, distinguish between the simplex and half duplex mode of communication.
(c) Briefly illustrate what is meant by the physical topology of a network. Given that there are n devices in a network, what is the number of cable links required for the following topologies:
(i) Mesh (ii) Ring (iii) Bus (iv) Star
(d) Identify which layer of the OSI model each of the five functions below is most likely to belong to. It is also possible that one or more of the functions cannot be mapped to an OSI layer. If this is the case, explain why.
(i) Translating between EBCDIC to ASCII (ii) Defining the pin-outs in a connector used to attach to a network cable (iii) Generating error correction codes for packet error correction (iv) Arbitrating between multiple nodes attached to a single medium (v) Providing an interface to a visual packet monitoring program
(e) Why is digital transmission better than analog transmission over a long distance where repeaters are needed in any case? Give two advantages of digital transmission over analogue transmission.
(a) The key elements of a protocol are the syntax, semantics and timing. Give a brief explanation of each of these key elements. (b) A file contains 4 million bytes. Compare
electrical project produse eneargy desingn
a) Describe Schmitt trigger with the help of transfer characteristics. b) Also get the expression of hysteresis voltage VH and output waveform for sinusoidal input signal
force and torque in magnetic field system
a mass of 20 kg is lifted u p to the roof of a cliff 100 m high.determie Ep of the mass while it is at the top
What are the Advantages of digital cameras Advantages of digital cameras over manual cameras include: no processing costs (As there is no need to develop film or make prints),
a. Write the advantages of choosing a single purpose processor over a general purpose processor. b. List out the hardware units that must be there in the embedded systems. c.
what is the need of coupling
D Flip Flop As we have seen in the SR flip flop when the inputs S= R are applied the forbidden or indeterminate state occurs. This state can destabilize the SR file flop.
Explain the construction of a MOSFET. Draw the symbols and diagrams of both P-channel and N-channel MOSFET. As JFET and MOSFET also have source, drain and gate. Its gate is ins
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