Digital Electronics - Section 1 (3)
Digital Electronics - Section 1
| 17. | The counter in the given figure is |
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Answer: Option B Explanation: When counter is 110 the counter resets. Hence mod 6. |
| 18. | A carry look ahead adder is frequently used for addition because |
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Answer: Option B Explanation: In look ahead carry adder the carry is directly derived from the gates when original inputs are being added. Hence the addition is fast. This process requires more gates and is costly. |
| 19. | Which device has one input and many outputs? |
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Answer: Option B Explanation: Demultiplexer takes data from one line and directs it to any of its N output depending on the status of its select lines. |
| 20. | Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is |
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Answer: Option B Explanation: |
minimum no. of 2 input NAND gate.
| 22. | If the functions w, x, y, z are as follows. w = R + PQ + RS , x = PQR S + PQR S + PQ R S Then |
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Answer: Option A Explanation: Use k-map, then it will be easy. |
| 23. | A full adder can be made out of |
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| 24. | For the truth table of the given figure Y = |
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Answer: Option D Explanation: Y = A B C + A B C + AB C + A B C = A B (C + C) + A B (C + C) = A B + AB = B(A + A) = B. |
