Digital Electronics - Combinational Logic Circuits
Exercise "Everything should be made as simple as possible, but not simpler."
- Albert Einstein
16.
For the device shown here, assume the D input is LOW, both S inputs are HIGH, and the
A. All are HIGH. B. All are LOW. C. All but D. All but
Answer: B
Explanation:
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17.
Which of the following combinations cannot be combined into K-map groups?
A. Corners in the same row B. Corners in the same column C. Diagonal corners D. Overlapping combinations
Answer: A
Explanation:
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18.
As a technician you are confronted with a TTL circuit board containing dozens of IC chips. You have taken several readings at numerous IC chips, but the readings are inconclusive because of their erratic nature. Of the possible faults listed, select the one that most probably is causing the problem.
A. A defective IC chip that is drawing excessive current from the power supply B. A solar bridge between the inputs on the first IC chip on the board C. An open input on the first IC chip on the board D. A defective output IC chip that has an internal open to V cc
Answer: D
Explanation:
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19.
Which gate is best used as a basic comparator?
Answer: C
Explanation:
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20.
The device shown here is most likely a ________.
A. comparator B. multiplexer C. demultiplexer D. parity generator
Answer: D
Explanation:
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input is HIGH. What is the status of the 
outputs?
are LOW.
are HIGH.