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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.
For the network shown in Figure, find the current delivered by the 10-V source and the voltage across the 3- resistor by means of mesh-current analysis.
Design a logic circuit when to provide an output when any two or three of four switches are closed.
Q. Balanced wye-connected loads drawing 10 kW at 0.8 power factor lagging and 15 kW at 0.9 power factor leading are connected in parallel and supplied by a 60-Hz, 300-V, three-phas
Determine the equivalent winding resistance: A 50 kVA, 2200/110 V, 50 HZ' transformer contain an HV winding resistance of 0.15 Ω and a leakage reactance of 0.45 Ω. The LV wind
State whether Lamis theorem is applicable for more than three coplanar concurrent forces?
a) Provide pertinent summary of the basic principles behind ECG monitoring b) Using MATLAB, provide plots of the "clean" and "noisy" ECG signals. Investigate the spectral es
Voltage is referred as Potential difference among two points. Potential means its force. I think so.voltage defination is 100% correct.
user defined function
Discuss the advantages and disadvantages of aluminium as compared to copper as a conductor of electricity. Advantages: Aluminium as a conductor of electricity as compared co
What is TPA (transient program area)? The memory system is divided in three major parts: transient program area, System is and XMS that is extended memory system.
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