Describing Logic Circuits - General Questions (3)

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Describing Logic Circuits - General Questions

17. 

Which logic gate does this truth table describe?

mcq3_1022_1
A. AND
B. OR
C. NAND
D. NOR

Answer: Option D

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18. 

How are the statements between BEGIN and END not evaluated in VHDL?
A. Constantly
B. Simultaneously
C. Concurrently
D. Sequentially

Answer: Option D

Explanation:

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19. 

Which of the examples below expresses the associative law of addition:
A. A + (B + C) = (A + B) + C
B. A + (B + C) = A + (BC)
C. A(BC) = (AB) + C
D. ABC = A + B + C

Answer: Option A

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20. 

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

Answer: Option B

Explanation:

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21. 

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

Answer: Option A

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22. 

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.

Answer: Option D

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23. 

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

mcq3_1025_1
A. a
B. b
C. c
D. d

Answer: Option C

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24. 

Which of the figures given below represents a NOR gate?

mcq3_1013_1
A. a
B. b
C. c
D. d

Answer: Option D

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