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Branch Name:
Exam Type:
Midterm
Final
X
Academic Year:
Form:
A
Semester:
B
First
Second
Summer
Course Name/No. : T103 : Essentials of computer Organization and Architecture
Exam Date:
MOCK EXAM
Exam Time: 2.5 hrs.
Section Number:
Question
No.
Part 1
Part 2
Part 3
Part 4
Total
Quality
Assurance
Responsible
Signature
Earned
Points
First Marker’s Second Marker’s
Signature
Signature
Reviewer’s
Signature
T103
Final Exam
Fall 2010-2011
PART 1 ALL QUESTIONS ARE REQUIRED [20 Marks]
Question 1: Choose the correct answer : (15 marks)
1. The faster a disk rotates
a.
b.
c.
d.
the faster it can deliver data to RAM
the faster it can read data from RAM
the faster it can deliver data to ROM
the slower it can deliver data to RAM
2. The cycle time for a bus operating at 90MHz is
a)
b)
c)
d)
14.1 ns
11.1 ns
11.1 s
111 ns
3. A byte is a group of _____ bits
a. nine
b. eight
c. sixteen
d. thirty two
4. Given the function F(X,Y,Z) = x'yz+x'yz'+xy simplification is :
a.
b.
c.
d.
x'y+xy
xy'+xy
xy+xy'
(x'y+xy)'
5. The MARIE architecture has the following characteristic :
a.
b.
c.
d.
Binary
Stored program
Seven registers for control and data movement
All of what mentioned above
6. The registers are interconnected, and connected with main memory through a _______
a.
b.
c.
d.
common data bus
CPU
ALU
CU
7. Suppose a program generates the address 1AA . In 14-bit binary, this number is: 00000110101010 . The
first 7 bits of this address go in the _____, the next 4 bits go in the ______, and the final 3 bits indicate the
______ within the block.
Form A
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T103
Final Exam
a.
b.
c.
d.
Fall 2010-2011
tag field, block field, the word
tag field, the word ,block field
block field
None
8. The 400MHz refers to the speed of the _______
a.
b.
c.
d.
System bus
system control
transferring data
None
9. There are two types of write policies ______ , _______
a.
b.
c.
d.
write through and write back .
Read through and write back .
write forward and write back .
none
10. Ports allow movement of data between a system and its ________ devices.
a.
b.
c.
d.
External
Internal
semi permanent
shell
11. ________ is a set of wires that simultaneously convey a single bit along each line.
a.
b.
c.
d.
A modem
A bus
A port
A processor
12. In 8-bit signed magnitude, if positive 3 is : 00000011 then Negative 3 is :
a.
b.
c.
d.
1100001
11111100
10000011
None
13. Boolean Algebra is an algebra for the __________ that can take on only two values, typically true or
false .
a.
b.
c.
d.
Form A
Manipulation of objects
drawing of objects
twisting of objects
All of what mentioned above .
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T103
Final Exam
Fall 2010-2011
14. Serial ports send data as
a. one pulse along one or two data lines
b. a series of pulses along one or two data lines
c. three pulses along one or two data lines
d. a series of pulses along only one data lines
Question 2 .Fill in the Blank : (5 marks)
a) ATA stands for _______________ attachment , which describes how the hard disk interfaces with (or connects to)
other system components.
b) The normal execution of a program is altered when an event of higher-priority occurs. The CPU is alerted to such
an event through an ________________________________
c) ISA stands for A computer's ________________________
d) At the most basic level, a computer is a device consisting of three pieces , so please write down with the right task
A processor : ___________________________, A mechanism : ___________________________
A memory :
____________________________
PART 2 : 2 Questions only are required . [ 10 Marks ]
1) Explain using the truth table the Inverse Law for AND and OR
Inverse law : XNOT(X) = 0
, X + NOT(X) = 1 [ 5 marks ]
2) Write down the RTL for the ADD instruction given value X [ 5 marks]
3) Draw the combination circuit that directly implements the following Boolean expression [ 5 marks]
F(x,y,z) =( xy XOR (y+z')) '+x'z.
4)
a) What is the cycle time for a bus operating at 90MHz? [3 marks]
b) How many kilobytes (KB) are in 1 gigabyte (GB)? [2 marks]
PART 3 : 2 question are required [10 marks ]
1. Given the two binary numbers X= 1010100 and Y = 1000011 perform the subtraction using the 2’s complement
[5 marks] :
(a) A-B
(b) B-A
2) Part a: Calculate the bias of the 14-bit floating-point model.[5 marks]
Part b: Convert the below model to float: [5 marks]
Form A
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T103
Final Exam
Fall 2010-2011
3) Simplify the following expressions in sum of products [ 5 MARKS]:
i)
x’z’+y’z’+yz’+xy
ii) AC’+B’D+A’CD+ABCD
PART 4 : ALL QUESTIONS ARE REQUIRED [ 60 MARKS ]
1) Draw a logical diagram using only two – input NAND gates to implement the following expression :
(AB+A’B’)(CD’+C’D) [10 marks]
2) Design a combinational circuit showing the logical gates that adds one to a 4-bit binary number A3A2A1A0.
For example , if the input of the circuit is A3A2A1A0= 1101 , the output is 1110. The circuit can be designed
using four half adders.[10 marks]
3) What are the differences between a point-to-point bus and a multipoint bus? [ 5 marks]
4) Write the following code segment in MARES’ assembly language [ 10 marks]
If x > 1 then
Y = X + X;
X = 0;
End if ;
Y = Y +1;
6 . Draw the connection of MARIE’s Load instruction . [ 15 marks]
MAR  X
MBR  M[MAR]
AC  MBR
7. Draw the connection of MARIE’s ADD instruction
MAR  X
MBR  M[MAR]
AC  AC + MBR
Form A
5/5