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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.
Name the Effects of electric current There are three Effects of electric current:- A) magnetic effect B) chemical effect C) heating effect
Q. For given asymptotic Bode plots. (a) Find ¯H 1 , ¯H 2 , and ¯H 3 at ω = 5 rad/s. (b) At what angular frequency ω is the magnitude of ¯H 4 (jω) one-half of the magnitude o
Half-wave rectifier: A half-wave rectifier will just only give one peak per cycle and for this reason and other reasons is only employed in extremely small power supplies. A f
Explain the term assembler directives. An assembler directive is a statement to provide direction to the assembler to execute the task of assembly process. These assembler dire
how emitter current equal to collector current
Q. With a neat circuit diagram explain the working of a Hartley oscillator using an npn transistor and obtain the expression for oscillation frequency and for minimum gain for sust
Q. Working of Electrically erasable programmable rom EEPROM is used for remote-area applications. The device is provided with special pins which, when activated electrically, a
Transfer Characteristics The transfer characteristics of power MOSFET transfer characteristic shown the variation of ID with V GS denote the drain current with shorted
Q. Explain The Input Characteristics Of Common Emitter Configuration? Input characteristics:In the figure the abscissa is the base current IB, The ordinate is the base to emitter
Permanent magnets are made of (A) Soft magnetic materials. (B) Hard magnetic materials. (C) Semi conductors. (D) Super conductors.
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