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Digital Electronics
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Digital Concepts
See What Others Are Saying!
Question
Which of the following statements does NOT describe an advantage of digital technology?
Options
A. The values may vary over a continuous range.
B. The circuits are less affected by noise.
C. The operation can be programmed.
D. Information storage is easy.
Correct Answer
The values may vary over a continuous range.
More questions
1. An invalid condition in the operation of an active-HIGH input S-R latch occurs when ________.
Options
A. HIGHs are applied simultaneously to both inputs S and R
B. LOWs are applied simultaneously to both inputs S and R
C. a LOW is applied to the S input while a HIGH is applied to the R input
D. a HIGH is applied to the S input while a LOW is applied to the R input
Show Answer
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Discuss
Correct Answer: HIGHs are applied simultaneously to both inputs S and R
2. The term buffer/driver signifies the ability to provide low output currents to drive light loads.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
3. The time needed for an output to change from the result of an input change is known as:
Options
A. noise immunity
B. fan-out
C. propagation delay
D. rise time
Show Answer
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Discuss
Correct Answer: propagation delay
4. Why are the maximum value of
V
OL
and the minimum value of
V
OH
used to determine the noise margin rather than the typical values for these parameters?
Options
A. These are worst-case conditions.
B. These are normal conditions.
C. These are best-case conditions.
D. It doesn't matter what values are used.
Show Answer
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Discuss
Correct Answer: These are worst-case conditions.
5. Which of the following is correct for a gated
D
flip-flop?
Options
A. The output toggles if one of the inputs is held HIGH.
B. Only one of the inputs can be HIGH at a time.
C. The output complement follows the input when enabled.
D.
Q
output follows the input
D
when the enable is HIGH.
Show Answer
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Discuss
Correct Answer:
Q
output follows the input
D
when the enable is HIGH.
6. Data transfer from I/O to external data memory can only be done with the MOV command.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
7. A 64-bit word consists of ________.
Options
A. 4 bytes
B. 8 bytes
C. 10 bytes
D. 12 bytes
Show Answer
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Discuss
Correct Answer: 8 bytes
8. What is the difference between a 7490 and a 7492?
Options
A. 7490 is a MOD-12, 7492 is a MOD-10
B. 7490 is a MOD-12, 7492 is a MOD-16
C. 7490 is a MOD-16, 7492 is a MOD-10
D. 7490 is a MOD-10, 7492 is a MOD-12
Show Answer
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Correct Answer: 7490 is a MOD-10, 7492 is a MOD-12
9. A data acquisition system may communicate via two common buses: the data bus and the control bus.
Options
A. True
B. False
Show Answer
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Correct Answer: True
10. Design costs for standard cell ASICs are ________ those for MPGAs.
Options
A. lower than
B. about the same as
C. higher than
D. none of the above
Show Answer
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Discuss
Correct Answer: higher than
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