Electronics and Communication Engineering - Digital Electronics

46. 

Decimal number 5436 when converted into 9's complement will become

A. 4356
B. 4653
C. 4563
D. 4655

Answer: Option C

Explanation:

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47. 

What is output 'Z' of an EX-OR gate, whose all inputs are set at A?

A. Z = A
B. Z = 1
C. Z = 0
D. Z = A

Answer: Option C

Explanation:

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48. 

Minimum number of J-K flip-flop needed to construct a BCD counter is

A. 2
B. 3
C. 4
D. 5

Answer: Option C

Explanation:

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49. 

The following switching functions are to be implemented using a decoder

  1. f1 = ∑m (1, 2, 4, 8, 10, 14)
  2. f2 = ∑m (2, 5, 9, 15)
  3. f3 = ∑m (2, 4, 5, 6, 7)
The minimum configuration of decoder is

A. 2 to 4 line
B. 3 to 8 line
C. 4 to 16 line
D. 5 to 32 line

Answer: Option C

Explanation:

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50. 

For the logic circuit of the given figure the simplified Boolean expression is

A. A ⊕ B
B. A + B
C. AB
D. A + B

Answer: Option A

Explanation:

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