# 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

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

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

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

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