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Home ‣ Digital Electronics ‣ Combinational Logic Circuits See What Others Are Saying!
- Question
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.
Options- 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 Vcc
- Correct Answer
- An open input on the first IC chip on the board
- 1. The programming technologies that are used in FPGA devices include SRAM, flash, and antifuse, with flash being most common.
Options- A. True
- B. False Discuss
- 2. Which of the following is not generally associated with flip-flops?
Options- A. Hold time
- B. Propagation delay time
- C. Interval time
- D. Set up time Discuss
- 3. A 555 operating as a monostable multivibrator has an R1 of 220 kΩ. Determine C1 for a pulse width of 4 ms.
Options- A. 0.017 µF
- B. 17 pF
- C. 170 pF
- D. 1,700 µF Discuss
- 4. An effective time delay device can be constructed by using the propagation delay characteristic of parallel shift registers.
Options- A. True
- B. False Discuss
- 5. If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
Options- A. 1
- B. 2
- C. 7
- D. 8 Discuss
- 6. The complex programmable logic device (CPLD) features a(n) ________ type of memory.
Options- A. volatile
- B. nonvolatile
- C. EPROM
- D. volitile EPROM Discuss
- 7. Digital electronics must use a numbering system that has more than ten digits.
Options- A. True
- B. False Discuss
- 8. The final step in a design flow in which the logic design is implemented in the target device is called ________.
Options- A. design entry
- B. simulation
- C. downloading
- D. compiling Discuss
- 9. Which of the following is NOT a type of memory?
Options- A. RAM
- B. ROM
- C. FPROM
- D. EEPROM Discuss
- 10. Unused TTL inputs should be tied LOW.
Options- A. True
- B. False Discuss
More questions
Correct Answer: False
Correct Answer: Interval time
Correct Answer: 0.017 µF
Correct Answer: False
Correct Answer: 1
Correct Answer: nonvolatile
Correct Answer: False
Correct Answer: downloading
Correct Answer: FPROM
Correct Answer: False
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