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
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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