Exercise: Digital Electronics

Questions for: Digital Electronics

Boolean expression for the output of XNOR (Equivalent) logic gate with inputs A and B is
A:
AB + AB
B:
AB + AB
C:
(A + B). (A + B)
D:
(A + B). (A + B)
Answer: C

(A + B) (A + B) = A ⊕ B.

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718 = __________ .
A:
1110002
B:
1110012
C:
1000012
D:
1100012
Answer: B

71 in octal = 7 x 8 + 1= 57 in decimal = 111001 in binary.

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A combination circuit is one in which the output depends on
A:
input combination at that time
B:
input combination and previous output
C:
input combination and previous input
D:
present output and previous output
Answer: A

Combinational circuit does not have memory.

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For the logic circuit of the given figure the simplified Boolean equation
A:
Y = (A + B) (C + D) (E + F)
B:
Y = A = B + C + D + E + F
C:
ABCDEF
D:
ABC + DEF
Answer: A

= (A + B) (C + D) (E + F).

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10112 x 1012 = __________ 10
A:
55
B:
45
C:
35
D:
25
Answer: A

1011 = 11 in decimal and 101 = 5 in decimal, 11 X 5 = 55.

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