Kingdom of Saudi Arabia
Majmaah University
College of Engineering
EE 207
Final Exam
Academic Year: - 1434-1435 / 2013-2014
Subject: Logic Design Lab.
Date: 13th May, 2014 (09:00 – 12:00)
Term: Subject Code: Time: -
Second
EE 207
3:00 Hours
Name: _________________________________ ID: _____________________________
Question # 1:
(10 Points)
1- A Boolean function can be transformed from _________________to circuit diagram.
2- A_______________ is defined as a single variable or its compliment within a term.
3- When both augend and addend bits are equal to 1, then the ______________consists two
digits.
4- For____________, three of the four outputs will be equal to zero (0) and only one output
will be equal to one (1).
5- The _____________has the limitation that one input can be active at any given time.
6- A priority encoder is an encoder circuit that includes the ________________function.
7- The three selection lines S0, S1, & S2, selects the particular input to be _______________
and applied to the output.
8- Binary number system is the most natural system for a_______________.
9- The __________________that are controlled by a clock transition are known as flip-flops.
10- The ______________for the latches are set and reset.
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Question # 2:
(10 Points)
1- A + 1 =
a- 1
b- 0
c- A
d- A'
2- A full adder performs the addition of three bits, where there are two significant bits and
____________.
a- Sum
b- Carry
c- Borrow
d- Difference
3- If S = X'Y'Z + X'YZ' + XY'Z' + XYZ then the simplest form of ' S ' is
a- S = X + (Y + Z)
b- S = (X  Y(  Z
c- S = (X'  Y' (  Z
d- S = X + (Y' + Z')
4- Write the Boolean expression for S and C.
5- Decoder detects unique input combination and produces______ active output/outputs.
a- 1
b- 2
c- 3
d- 4
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6- Some decoders have ______ or more Enable inputs that must satisfy a given logic
condition in order to enable the circuit.
a- 1
b- 2
c- 3
d- 4
7- The memory elements that operate with signal levels are referred as:
a- Flip-Flops
b- Latches
c- Encoder
d- Decoder
8- The Latch is said to be in Set State, when:
a- Q = 0 & Q’ = 1
b- Q = 1 & Q’ = 0
9- A ___________is a group of flip-flops ,each one of which is capable of storing one bit
information
a- Counter
b- Register
c- Latch
d- Multiplexer
10- For shift registers, each ____________shifts the contents of the Register one bit position
to the right.
a- Serial Input
b- Clock pulse
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Question # 3:
(10 Points)
Construct 3 To 8 Lines Decoder using following IC:
Complete the Truth Table given below.
Truth Table for 3 To 8 Lines Decoder
Inputs
Outputs
A2
A1
A0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
O0
O1
O2
O3
O4
O5
O6
O7
ghghgjhjhj
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Question # 4:
(10 Points)
Implement the BCD to 7-Segment Display circuit as shown in Figure.
Prove the following table and show it to instructor.
Decimal
0
1
2
3
4
5
6
7
8
9
BCD
A
0
0
0
0
0
0
0
0
1
1
B
0
0
0
0
1
1
1
1
1
1
C
0
0
1
1
1
1
0
0
0
0
D
0
1
1
0
0
1
1
0
0
1
Instructor’s Signature:
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