Friday, 2 December 2011

Model question paper of Digital Electronics of Diploma 3rd Sem - E & CE

DERARTMENT OF TECHNICAL EDUCATION
DIPLOMA COURSE IN ELECTRONICS & COMMUNICATION ENGG.
THIRD SEMESTER
                                                                                                                                              
MODEL QUESTION PAPER
Digital Electronics and Introduction to Microprocessor
MAX MARKS:100                                                               TIME :3Hrs
       
INSTRUCTIONS:-
1    SECTION-I IS COMPULSORY   
2    ANSWER ANY TWO FULL QUESTIONS FROM EACH OF THE REMAINING    
    SECTIONS.
SECTION:  I       
               
1    a    Fill in the blanks with suitable words                                      1X5   
    (i)    The number of comparators required to build an 8-bit flash
        ADC is--------------       
    (ii)    Register which keeps track of instruction execution is---------   
    (iii)    MC68000 is a  ---------- bit processor       
    (iv)    RISC stands for ----------       
    (v)    A basic memory cell in a DRAM is  ----------       
               
    b    Write a note on Generic Array Logic                        5   
               
    SECTION:  II       
               
2    a    Explain the circuit operation of TTL Nand gate for low and
        high state                                                                            10   
    b    What three characteristics of real wires add up to distort
        signals that move through them                                        3       
    c    What is the IEEE/ANSI symbol for tristate outputs     2   
               
3    a    Explain the working of Binary ladder network for converting
        the digital to analog data                                                                8
    b    Define the terms Resolution & Accuracy as applied to DAC    4   
    c    Determine the resolution of a 12-bit A/D converter having a
         full scale analog input voltage of 5v.                                             3 
                   
4    a    Explain the working of Successive approximation type ADC
        with block diagram     8
        the digital to analog data   
    b    Define quantization error in ADC’s    3   
    c    Explain the working of low frequency function generator using
        DAC              4   
                                                                          SECTION: III       
               
5    a    Define the terms i) memry cell ii) memory word iii) Access
        time     6           
    b    With A CPU memory connection block diagram explain the
         steps that take place when the CPU writes to memory    6   
    c    Explain the construction of basic SRAM memory cell    3   
               
6    a    Two 16MB RAMs are used to build a RAM capacity of 32MB.
         Show the configuration and also state the address inputs for
        which the two RAMs will be active. The two RAMs have
        common i/o pins, a write enable i/p that is active low and a
        active high chip select i/p.                 8   
    b    Write a note on Cache memories    4
    c    mention the differences between fixed logic and
        programmable logic                           3   
               
7    a    With neat block diagram explain the internal architecture of
        CPLD    8
    b    Implement the Boolean function Y= BC+ A C+ABC using
        PAL    5
    c    Mention the number of i/o lines in PAL device designated as
        PAL-16L8    2   
               
                                                                 SECTION: IV       
               
8    a     Explain the inside of a Microprocessor with a neat schematic    7   
    b    Explain the following addressing modes i) Immediate 
        ii) Indexed    04   
    c    List the differences between RISC and CISC processors    4   
               
9   a    List the differences between Microprocessor and
        Microcontroller                                                                   4
    b    Explain the inside of a Microcontroller with a neat schematic    7   
    c    List the advantages and disadvantages of LCD    4   
               
               
10    a    Explain the operation of seven segment  display.    6 
        b    Explain the operation dynamic scattering type of LCD.   6
        c    Write a note on multiplexed displays.    3 

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