Jawaharlal Nehru Technological University Hyderabad 2002 B.Tech Computer Science and Engineering gate - Question Paper

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1.8 —If X then Y unless Z“ is represented by which of the subsequent formulas in
prepositional logic? (—
¬
—, is negation, —
“ is conjunction, and —‰“ is implication)
(a) (X
¬
Z)‰Y (b) (X
Y)‰
¬
Z (c) X‰(Y
¬
Z) (d) (X‰Y)
¬
Z
1.9 A device employing INTR line for device interrupt puts the CALL instruction on the
data bus while
(a) INTA is active (b) HOLD is active
(c) READY is active (d) None of the above
1.10 In 8085 which of the subsequent modifies the program counter?
(a) Only PCHL instruction (b) Only ADD instructions
(c) Only JMP and CALL instructions (d) All instructions
1.11 In serial data transmission, every byte of data is padded with a ”0‘ in the
beginning and 1 or 2 ”1‘s at the end of byte because
(a) Receiver is to be synchronized for byte reception
(b) Receiver recovers lost ”0‘s and ”1‘s from these padded bits
(c) Padded bits are useful in parity calculation
(d) None of the above
1.12 Minimum sum of product expression for f(w,x,y,z) shown in Karnaugh-map beneath
is
wx
00 01 11 10
yz
0 one one 0
00
x
0 0 1
01
x 0 0 1
11
0 one 1
x
10
'
' '
(a) xz y z
+
(b) xz zx
+
' '
(c) x y zx
+
(d) None of the above
1.13 Which of the subsequent is not a form of memory?
(a) instruction cache (b) instruction register
(c) instruction opcode (d) translation look-a-side buffer
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