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# Digital Electronics - Describing Logic Circuits

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### Exercise

"Love is like a war, Easy to begin Hard to end."
- (Proverb)
6.

Which of the figures (a to d) is the DeMorgan equivalent of Figure (e)?

 A. a B. b C. c D. d

7.

Which of the figures in figure (a to d) is equivalent to figure (e)?

 A. a B. b C. c D. d

8.

In VHDL, the mode of a port does not define:

 A. an input. B. an output. C. both an input and an output. D. the TYPE of the bit.

9.

Which of the following equations would accurately describe a 4-input OR gate when A = 1, B = 1, C = 0, and D = 0?

 A. 1 + 1 + 0 + 0 = 1 B. 1 + 1 + 0 + 0 = 01 C. 1 + 1 + 0 + 0 = 0 D. 1 + 1 + 0 + 0 = 00

10.

Which of the examples below expresses the distributive law?

 A. (A + B) + C = A + (B + C) B. A(B + C) = AB + AC C. A + (B + C) = AB + AC D. A(BC) = (AB) + C