Download Pipelining improves CPU performance due to

Department of Computer Engineering
National Institute of Technology Karnataka, Surathkal
Class Test -1 [CO250]
Semester: IV
Date: 11.02.2010
Marks: 15
1. Pipelining improves CPU performance due to
Ans: c
(a) Reduced memory access time (b) increased clock speed (c) the
introduction of parallelism (d) additional functional units
2. CPU performance may be measured in (a) BPS (b) MIPS (c) MHz (d)
VLSI
Ans: c
3. A 5 stage pipeline with the stages taking 1, 1, 3, 1, 1, units of time
has a throughput of (a) 1/3 (b) 1/7 (c) 7 (d) 3
Ans: a
4. Which of the following is an illegal instruction
Ans: b
(a) MoV Ax, 30000 (b) iNc Al, 1 (c) aNd bx, bx (d) add ax, 30
5. Given that the subprogram putc displays the character in al, the
effect of the following instructions:
Ans: b
mov al, ‘a’
add al, 2
call putc
is to (a) display 2 (b) display c (c) display a (d) display a blank
6. An assembly language instruction (a) always has a label (b) always
takes at least 1 operand (c) always has an operation field (c) always
modifies the status register
Ans: c
7. The effect of the following instructions
Ans: a
push ax
add ax, 4
pop bx
mov cx, ax
push bx
pop ax
on the ax register is (a) leave it with its original value (b) add 4 to it (c)
clear it (d) double it
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8. To copy the hexadecimal number A to the bh register you write
(a) mov 0bh, ah (b) mov bh, 0ah (c) mov bh, ah (d) mov bh, [ah]
Ans: b
9. What is the output of the following code, if AL=88 BCD, CL=49 BCD
ADD AL, CL
Ans: b
DAA
(a) D7, CF=1 (b) 37, CF=1 (c) 73, CF=1 (d) 7D, CF=1
10. What is the output of the following code, if AL= 49 BCD, BH= 72
BCD
Ans: c
SUB AL, BH
DAS
(a) AL=D7, CF=1. (b) AL=7D, CF=1. (c) AL=77, CF=1 (d) none of them.
11. What is the output of the following code: PUSH AL
Ans: d
(a) Decrement SP by 2 & push a word to stack
(b) Increment SP by 2 & push a word to stack
(c) Decrement SP by 2 & push an AL to stack
(d) Illegal
12. Given a 5 stage pipeline with stages taking 1, 2, 3, 1, 1 units of
time, the flow through time of the pipeline is:
Ans: c
(a) 8 (b) 1/8 (c) 1/3 (d) 3
13. After INC BX, where BX = 0FFH, CF =______, ZF = _______. 0, 0
14. What is the reset address with CS and IP, of 8086?
Ans:
CS = FFFFh, IP=0000h
15. With example what is EQU directive?
Ans: It is used to give a name to some value or symbol.
Eg. X EQU 03h
**** END ****
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