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- Question
A logic probe is placed on the output of a digital circuit and the probe lamp is dimly lit. This display indicates ________.
Options- A. that an open or bad logic level exists
- B. a high level output
- C. a high-frequency pulse train
- D. that the supply voltage is low
- Correct Answer
- that an open or bad logic level exists
- 1. With an OR gate, the output is HIGH only when both inputs are HIGH.
Options- A. True
- B. False Discuss
- 2. Which format requires fewer conductors?
Options- A. Parallel
- B. Serial
- C. Both are the same
- D. Cannot tell Discuss
- 3. ________ is the output frequency of the counter shown below.
Options- A. 4 MHz
- B. 20 kHz
- C. 210.5 kHz
- D. 800 Hz Discuss
- 4. A good example of the use of a digital representation of an analog quantity is the audio recording of music.
Options- A. True
- B. False Discuss
- 5. Which of the following RAM timing parameters determine its operating speed?
Options- A. tACC
- B. tAA and tACS
- C. tCO and tOD
- D. tRC and tWC Discuss
- 6. Typically, how often is DRAM refreshed?
Options- A. 2 to 8 ms
- B. 4 to 16 ms
- C. 8 to 16 µs
- D. 1 to 2 µs Discuss
- 7. The architecture of a PAL differs slightly from that of a PROM.
Options- A. True
- B. False Discuss
- 8. CCD stands for ________.
Options- A. capacitor charging device
- B. capacitor-capacitor drain
- C. charged-capacitor device
- D. charge-coupled device Discuss
- 9. Dynamic memories, such as the 2118 16K × 1 RAM, have to multiplex the address bus.
Options- A. True
- B. False Discuss
- 10. The total amount of external code memory that can be interfaced to the 8051 is:
Options- A. 32K
- B. 64K
- C. 128K
- D. 256K Discuss
More questions
Correct Answer: False
Correct Answer: Serial
Correct Answer: 20 kHz
Correct Answer: False
Correct Answer: tRC and tWC
Correct Answer: 4 to 16 ms
Correct Answer: True
Correct Answer: charge-coupled device
Correct Answer: True
Correct Answer: 64K
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