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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) Describe why ordinary junction transistor is known as bipolar. (b) Describe working of NPN transistor as common Base configuration. Describe working of NPN transistor in
Charging of the capacitor: Considering the below diagram, with slight approximation the ripple voltage can be supposed as triangular. To the cut-out point from the cut-in poin
Briefly explain single mode and multimode fibres The optical fibres were categorized within two according to the number of modes it passes as: • Single mode fibres • Multi mode
An eight pole dc generator has an armature wound with 768 conductors each capable of carrying 50A without overheating. The emf generated in each conductor is 1.5V. Calculate the th
Q. (a) Consider a three-phase star or wye half-wave recti?er with a purely resistive load R. Determine: (i) efficiency, (ii) formfactor, (iii) ripple factor, (iv) TUF, and (v) PIV
Drift Current and Diffusion Current : There are two mechanisms in which electrons and holes move through a semiconductor. One of these is termed as drift and other is diffusi
how we can say that 3 phase induction motor is short curcited practically?
Explain working of Encoders? Encoding is the process of forming an encoded representation of a set of inputs, and it is the converse of the decoding operation. An encoder is a
Speed and Torque Control of Polyphase Induction Motors The induction motor is valuable in so many applications because it combines simplicity and ruggedness. Although a good nu
How DRAM's are different from SRAM's? Why DRAMs are said to use address multiplexing? Ans Dynamic RAM (DRAM) is basically the same as SRAM except that it recollects data f
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