| QUESTION
BANK
BCA
– I
Principles
of Digital Electronics
(Paper-VII)
1.
Semiconductors: Junction diodes, Bipolar and FET transistors, biasing
Techniques, transistor as a switch.
Q-1) Discuss construction, biasing and working of a bipolar transistor.
(20)
Q-2) Discuss the working of
PN junction diode. (10)
Q-3) Discuss construction
and working of Metal Oxide Semiconductor Field Effect Transistor (MOSFET)
(20)
Q-4) Compare Bipolar and FET
transistors. (10)
Q-5) Discuss I-V characteristics
of PN diodes. What is cut-in voltage? (10)
Q-6) Discuss the construction
and working of Junction Field Effect transistor. (20)
Q-7) How is transistor used
as a switch? (10)
Q-8) What is Pinch off voltage
in MOSFET? Explain I-V characteristics if this transistor (MOSFET). Compare
FET with BJT (20)
Q-9) Why FET is called voltage
operated device? (10)
Q-10) Sketch a drain characteristic
for an n-channel JFETS (10)
Q-11) Write a note on any
biasing technique and find the Q-point. (10)
Q-12) Discuss construction
and working of JFET. (10)
Q-13) Classify semiconductors
in detail.
Q-14) Define (a) Breakdown
Voltage (b) Peak Inverse Voltage (c) Knee Voltage.
Q-15) What are advantages of
transistors over vacuum tubes?
Q-16) Differentiate NPN and
PNP transistors.
Q-17) How transistors work
as an OFF switch? Explain.
Q-18) Explain the enhancement
mode of MOSFET.
Q-19) Explain the depletion
mode of JFET and MOSFET.
Q-20) Explain biasing of PN
diode. Also write limitations of PN diode.
2. Information
Representation: Number Systems, Integer and Floating point representation,
character codes (ASCII, EBCDIC), Error detecting and correcting codes.
TTL, STTL, CMOS logic families.
Q-1) Convert the following
hexadecimal numbers into their decimal equivalent. (i) 071E (ii) 3FFE
(iii) 031F (iv) C1E1 (V) 2180 ---(10)
Q-2) Convert the following
decimal numbers into their hexadecimal equivalent. (i) 0179 (ii) 4083
(iii) 16273 (iv) 32767 (v) 64710 ----(10)
Q-3) Show Fan out of standard
TTL in low and high output (5-7)
Q-4) Draw and explain the working
of TTL (10)
Q-5) Write short note on TTL
characteristics (10)
Q-6) Compare TTL and CMOS
logic families (10)
Q-7) Change following binary
no. into decimal no. (i) 1011.01 (ii) 10001.111 ---- (10)
Q-8) What is an ASCII code?
What are its advantages? (10)
Q-9) Compare TTL, STTL and
CMOS logic families. (10)
Q-10) Determine the value
of base x if (211) x = (152) 8 (10)
Q-11) Write short note on
following:
(i) Error Detecting and Correcting Codes
(ii) Universal Gates
(iii) Advantages of Synchronous Counter (20)
Q-12) How Error detection
and correction carried out? (10)
Q-13) What are weighted and
non-weighted codes? Also discuss code conversion between octal and hexadecimal
giving examples. (10)
Q-14) What are BCD codes?
Discuss their merits and demerits --
Q-15) What is the full form
of ASCII? What are the maximum characters that can be represented by ASCII
codes? Discuss their areas of application. --
Q-16) What are gray codes?
What are their applications? --
3. Logic Design: Logic gates, flip - flops, clocks and timers,
registers, counters.
Q-1) Discuss the working of
synchronous counter. (10)
Q-2) Discuss the design and
working of an edge triggered flip-flop with preset and clear inputs. (20)
Q-3) Discuss the working of
a JK Master Slave flip-flop. (20)
Q-4) Discuss the working of
decade counter (synchronous) (20)
Q-5) Discuss construction
and working of HEX counter (Mod-6 Ripple counter) (10)
Q-6) What are ripple counters?
Discuss its working. (20)
Q-7) What is a JK Flip Flop?
Discuss the race around condition in that flip flop. How is it rectified?
(20)
Q-8) Draw the circuit diagram
and explain the working of a decade ripple counter. (10)
Q-9) What are the advantages
of synchronous counter? (10)
Q-10) Draw the logic diagram
of Master Slave D Flip-Flop using NAND gates. (10)
Q-11) Draw the logic diagram
of clocked RS Flip-Flop four NAND gates and explain its truth table. (10)
Q-12) Explain BCD counter
with example. (10)
Q-13) What are shift register?
Explain serial transfer of information using shift registers. (20)
Q-14) What is universal shift
register? Draw the circuit of a 4-bit universal shift register. (10)
Q-15) Design 4-bit Ripple
counter with D Flip-flops. (10)
Q-16) Discuss drawback of
RS flip flop and how will these be removed? (10)
Q-17) Discuss a counter that
has repeated sequence of six state. Draw the Excitation table and logic
diagram of counter. (10)
Q-18) Discuss controlled shift
registers. (PISO and Bidirectional shift register). (20)
Q-19) Differentiate Combinational
and Sequential circuits. --
Q-20) What is the use of clear
and preset inputs? --
Q-21) What do you mean by
edge-triggering of Flip-Flop? --
Q-22) Differentiate Positive
and negative edge triggering of the clock pulse? --
4. Digital IC’s: Basic laws of Boolean algebra, circuit
design standard (NAND) gates, Adder, decoder/encoder demultiplexer / multiplexer
design.
Q-1) Discuss the working of
2’s complement Adder/Subtractor Circuit. (10)
Q-2) Draw the logic circuit
for the Boolean equation:
Y = A’B’C’D + AB’C’D + ABC’D + ABCD’
(10)
Q-3) State and discuss De-Morgan’s
theorems. (10)
Q-4) Discuss the giving examples
and principles of Karnaugh mapping
(i) Y = S m (1,5,6,7) (ii) Y= p M (0,1,2,4,5,6,9,11,12,13,14,15) (20)
Q-5) Discuss in details the
Karnaugh simplification principles (10)
Q-6) What is a multiplexer?
What are its applications? Discuss in details one of the applications.
(20)
Q-7) Draw a logic diagram
of 4 to 10 line decoder using NAND gates. (10)
Q-8) What is the utility of
decoder? Describe and explain logic circuits of 3 X 8 decoder. (20)
Q-9) Write short note on (i)
Boolean Algebra (ii) Adder Circuits (20)
Q-10) Using Boolean Algebra
simplify expression: A.(B+B’C) (10)
Q-11) Explain the working
of Half Adder. (10)
Q-12) What is the role of
decoders in microcomputer? Explain the working of 4 X 10 decoder in details.
(20)
Q-13) Draw logic diagram and
T-table for full adder & half adder. (20)
Q-14) Perform the subtraction
by 2’s complement
(i) 11010 – 1000
(ii) 11010 -1101
(iii) 100 – 110000
(iv) 1010100 - 1010100 (20)
Q-15) Implement a full adder
with two 8 X 1 multiplexers (10)
Q-16) Write the expression
for Boolean function F(A,B,C) = S m (1,4,5,6,7) in a standard POS form.
(20)
Q-17) Differentiate Multiplexer
and Demultiplexer.
Q-18) Design 6-line –to-64
line decoder using
(a) 3 – line to 16-line decoder
(b) 5-line to 32-line decoder
(c) 4-line to 16-line decoder
(d) 4 line to 10 – line decoder (20)
Q-19) What is an encoder?
Differentiate encoder and decoder.
5. Boolean Algebra
& Circuit Design:
Semiconductor memory, static and dynamic devices, read only& random
access memory chips, PROMS and EPROMS. Address selection logic. Read and
write control timing diagrams for ICs.
Q-1) What are the advantages and disadvantages of Dynamic RAM? (10)
Q-2) Classify various types
of semiconductor memories and briefly discuss working of UVEPROM (20)
Q-3) Classify various types
of semiconductor memories and discuss briefly about each class (20)
Q-4) Draw the architecture
of RAM and PROM. How is address selection logic used to identify the correct
register? (20)
Q-5) Write short note on Memory
hierarchy (10)
Q-6) Describe the methods
of storing data in ROMs, PROMs, and EPROMs. What are their relative merits?
(20)
Q-7) How is charge refreshing
done in dynamic memories (10)
Q-8) Draw the read and write
control timing diagrams for Integrated Circuit (IC) and explain them.
(20)
Q-9) Explain in details of
different types of semiconductor memory. How address selection logic is
used in case of RAM? (20)
Q-10) Draw the circuit of
a basic RAM memory cell. --
Q-11) List the drawback and
advantages of DRAM Vs SRAM --
Q-12) Classify memories on
the basis of principles of operation. --
Q-13) Differentiate between
RAM and ROM. --
Q-14) Discuss the characteristics
of semiconductor memories. --
Q-15) Draw and discuss the
operation of a RAM cell. --
6. MOS and LSI
digital Systems
Analog to digital and Digital to analog conversion techniques, Microprocessor
compatible ADCs and interfacing techniques.
Q-1 Discuss with the help
of a circuit diagram the working of a 8-bit successive approximation ADC
(20)
Q-2 Discuss the principles
of Digital to Analog converters. What do you mean by resolution and accuracy
of a DAC? (20)
Q-3) Explain internal architecture
and working of Digital to Analog converter (20)
Q-4) Discuss construction
and working of dual slope ADC (20)
Q-5) Discuss Schmitt triggers.
Why it is needed? (10)
Q-6) Discuss architecture
and working of DAC (10)
Q-7) Describe the architecture
of µP (microprocessor) compatible ADC and explain its working. (20)
Q-8) Explain the working of
binary weighted D/A converter (DAC). (10)
Q-9) Explain Digital to Analog
conversion techniques. (20)
Q-10) Discuss the counter
method of A/D conversion. (10)
Q-11) Discuss simultaneous
A/D Converter. (10)
Q-12) Discuss the A to D conversion
technique, you find most efficient. (20)
Q-13) Discuss the interfacing
of ADC with microprocessors. (20)
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