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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.
Output Characteristics The output or drain characteristic of N - Channel power MOSFET. When gate is made positive with respect to the source an N type channel is formed
Q. Show the r’s Complement? Step1- get the (r-1)'s complement Step 2- add 1 to the result ex. 935 10 9 9 9
block diagram of digital control system and explain each block
A three-phase induction motor, operating at its rated voltage and frequency, develops a starting torque of 1.6 times the full-load torque and a maximum torque of 2 times the full-l
Multitasking - Single Processor Many Users Many Tasks In multitasking or also called time sharing systems multi user more than one users are sharing one processor
Explain explanatory notes on A/D conversion. The digital inventory is working a revolution into the field of microcontrollers, technology and microprocessors are used more effi
Q. (a) Excess-3 code is a 4-bit binary code for the 10 decimal digits and is found useful in digital computer arithmetic. Each combination is found by adding 3 to the decimal nu
A squirrel-cage inductionmotor operates at a slip of 0.05 at full load. The rotor current at starting is five times the rotor current at full load. Neglecting stator resistance and
Q. Explain the construction of depletion MOSFET? A slab of p-type material is formed from a silicon base and it is referred to as the substrate. It is the foundation upon which
A three - phase,wye - connected, 2500-kVA, 6600- V, 60-Hz turboalternator has a per-phase synchronous reactance and an armature resistance of 10.4 and 0.071 , respectively. Comput
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