# Electronics and Communication Engineering - Digital Electronics

31.

The dual of the function A(BC + BC + BC) is

 A. A + (B + C) (B + C) (B + C) B. A (BC + BC + BC) C. C(BA + CA + CA) D. ABC + ABC + ABC

Explanation:

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32.

Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after ACI 0 A4 H?

 A. 4 AH, 0 B. 4 AH, 1 C. 4 BH, 0 D. 4 BH, 1

Explanation:

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33.

For the shaded area in Venn diagram of the given figure, the Boolean expression is

 A. AB + BC + CA B. ABC + A B C C. ABC + A B C D. ABC+AB

Explanation:

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34.

If an inverter is placed at the input to an SR flip-flop, the result is

 A. T flip-flop B. D flip-flop C. JK flip-flop D. BCD decade counter

Explanation:

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35.

What is the direction of control bus?

 A. Unidirectional into μp B. Unidirection out of μp C. Bidirectional D. Mixed direction, i.e., some lines into μp an some others out of μp