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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 6
11.
Which of the following characteristic are necessary for a sequential circuit?
  1. It must have 6 gates
  2. It must have feedback
  3. Its output should depend on past value
Which of the above statements are correct?
1, 2, 3
1, 2
2, 3
1, 3
Answer: Option
Explanation:

The number of gates may be any.

12.
10112 x 1012 = __________ 10
55
45
35
25
Answer: Option
Explanation:

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

13.
For the logic circuit of the given figure the simplified Boolean equation
Y = (A + B) (C + D) (E + F)
Y = A = B + C + D + E + F
ABCDEF
ABC + DEF
Answer: Option
Explanation:

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

14.
A combination circuit is one in which the output depends on
input combination at that time
input combination and previous output
input combination and previous input
present output and previous output
Answer: Option
Explanation:

Combinational circuit does not have memory.

15.
718 = __________ .
1110002
1110012
1000012
1100012
Answer: Option
Explanation:

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

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