Digital Electronics - Section 1 (5)
Digital Electronics - Section 1
| 33. | An 8 bit DAC has a full scale output of 2 mA and full scale error of ± 0.5%. If input is 10000000 the range of outputs is |
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Answer: Option A Explanation: |
= 1004μA.
| 34. | The expression Y = pM (0, 1, 3, 4) is |
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Answer: Option A Explanation: This is product of sums expression. |
| 35. | The access time of a word in 4 MB main memory is 100 ms. The access time of a word in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is 0.95. The efficiency of memory access time is |
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Answer: Option B Explanation: Access time = 0.95 x 10 + 0.05 x 100. |
| 36. | The number of digits in octal system is |
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Answer: Option A Explanation: The octal system has 8 digits 0 to 7. |
| 37. | Which of the following is non-saturating? |
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Answer: Option C Explanation: Since it is non-saturating, ECL has low propagation delay. |
| 38. | The circuit in the given figure is |
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Answer: Option C Explanation: Since V(I) is lower state than V(0) it is a negative logic circuit. Since diodes are in reversed parallel, it is an AND gate. Note: In Boolean algebra it is recognized that a positive logic OR is a negative logic AND. Similarly a positive logic AND is a negative logic OR. |
| 39. | In the expression A + BC, the total number of minterms will be |
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Answer: Option D Explanation: The min terms are ABC + ABC + AB C + ABC + ABC. |
| 40. | For the gate in the given figure the output will be |
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Answer: Option D Explanation: If A = 0, Y = 1 and A = 1, Y = 0 Therefore Y = A. |
