Digital Electronics and Microprocessor 2022
Sub Code: - 2018304
2022(Odd)
Time : 3Hrs
Semester
III/CSE
DE&M
Full
Marks : 70
Pass
marks : 28
Group A
Choose the most suitable
answer from the following options: - (1*20=20)
(i) Minimum number of NAND gate required to implement full adder is
(a) 8
(b) 10
(c) 12
(d) 9
(ii) The most commonly used system for representing signed binary number
is the:
(a) 2’s complement
system
(b) 1’s complement
system
(c) 10’s complement
system
(d) Sign magnitude
system
(iii) The logical expression for a NOR gate is:
(a) X=A’+B
(b) X=A+B’
(c) X=A+B
(d) X=(A+B)’
(iv) Binary coded decimal or BCD is also known as
(a) 2841
(b) 4821
(c) 4281
(d) 8421
(v) D- flip flop can be made from a J-K flip flop by making
(a) J=K
(b) J=K=1
(c) J=0, K=1
(d)J=K’
(vi) When two asynchronous active low inputs present and clear or applied to a
J-K flip flop the output will be:
(a) Zero
(b) Undefined
(c) Previous state
(d) 1
(vii) In a positive edge triggered JK flip-flop, a low J and a low K
produces:
(a) Low state
(b) Toggle state
(c) High state
(d)No change
(viii) The condition for making a J-K flip-flop made to toggle
(a) J=0, K=0
(b) J=1, K=0
(c) J=0, K=1,
(d) J=1, K=1
(ix) The main difference between a register and a counter is:
(a) A register has
no specific sequence of states
(b) A counter has no
specific sequence of states
(c) A register has
capability to store one bit of information but counter has n-bit
(d) A register
counts data
(x) Minimum number of NOR gates required to implement full adder is:
(a) 10
(b) 9
(c) 11
(d) 12
(xi) Minimum number of 4:1 mux required to implement 64:1 mux is:
(a) 23
(b) 21
(c) 24
(d) 20
(xii) If a 10-bit ring has an initial state 1101000000, What is the state
after second clock pulse:
(a) 1101000000
(b) 0011010000
(c) 1100000000
(d) 0000000000
(xiii) A digital multiplexer is a combinational circuit that selects _________
(a) One digital
information from several source and transmits the selected one
(b) Many digital
information and convert them into one
(c) Many decimal inputs
and transmits the selected information
(d) None of the
above
(xiv)Convert binary into gray code 100101
(a)101101
(b) 001110
(c) 110111
(d) 111001
(xv) How many AND, OR and EX OR gates are required for the configuration of
full adder?
(a) 1,2,2
(b) 2,1,2
(c) 3,1,2
(d) 4,0,1
(xvi) Convert binary number into decimal number (11011.1011)2 into
decimal
(a) (27.6875)10
(b) (27.5874)10
(c) (26.9876)10
(d) (27.7893)10
(xvii) Master slave flip-flop is also referred to as
(a) Level triggered flip-flop
(b) Pulse triggered
flip-flop
(c) Edge triggered
flip-flop
(d) Edge-Level
triggered flip-flop
(xviii) How many inputs and outputs does a full adder have?
(a) 3,2
(b) 2,3
(c) 3,3
(d) 2,2
(xix) Which of the following addressing technique is not used in 8085
microprocessor?
(a) Register
(b) Immediate
(c) Register
indirect
(d) Relative
(xx) Which of the following is ALE (bar) signal pin in 8086 microprocessor?
(a) Pin 27
(b) Pin 31
(c) Pin 25
(d) Pin 26
Group:-"B"
➥ Answer all Five Questions: -
(5*4=20)
2.
Differentiate
between multiplexer and demultiplexer.
OR
Explain
the working o0f 4-bits register.
3. Compare serial
adder with parallel adder.
OR
Draw
the logic diagram of full adder using NAND gates.
4. Design Ex-OR
gates using NAND gates only.
OR
a. Realize basic
gates using NAND only.
b. Convert (845)10
into its equivalent BCD and excess-3 code.
5.
Draw
and explain the working of clocked R-S flip-flop with timing diagram.
OR
Draw
and explain master slave JK flip-flop with truth table.
6. Simplify the
Boolean expression Y (A,B,C)= (0,4,5,6,7) using k-map and draw logic circuit
after reduction of Boolean expression.
OR
Implement
NAND gate using 2:1 MUX.
Group:- "C"
➥ Answer all Five Questions: -
(5*6=30)
7.
Simplify
the following using k-map and implement using NAND-NAND gates only:
Y = (0,1,2,3,5,7,8,9,11)
OR
Simplify
using k-map and implement using NOR-NOR gates only:
f(A,B,C,D)
= (0,2,6,7,8,10,12,14,15)
8. Prove NOR gate
and NAND gate as universal gate with suitable diagrams.
OR
Define
modulus of counter and write down the number of flip-flop required to construct
mod 7 counter.
9. Explain
addressing modes of 8086 microprocessor with examples. Explain any three-arithmetic
instruction of 8086.
OR
Draw
and explain the functional block diagram of 8086 microprocessor. List different
registers and state their functions in 8085 microprocessor.
10.
a. Implement
OR gate using 2:1 MUX using “n-1” select lines.
b. Implement
16:1 MUX using 2:1 MUX.
OR
a. Design
half adder using NOR gates only.
b. Design
full adder using Half Adders.
c. Design
8 to 3 encoder using 4 to 2 encoder.
11.
Write
short notes on any two:
a. Sequential
circuits vs combinational circuits
b. A/D
converter
c. Display
Devices
OR
Explain
different types of memories. Differentiate between static and dynamic memory.
No comments:
Post a Comment
Please do not enter any spam link in the comment box and use English and Hindi language for comment.