Discussion
Home ‣ Electronics ‣ Testing and Troubleshooting Comments
- Question
A +5 V PCB power source that has been "pulled down" to a +3.4 V level may be due to:
Options- A. a circuit open
- B. a faulty regulator
- C. the half-split method
- D. a circuit short
- Correct Answer
- a circuit short
- 1. What is the next step after discovering a faulty gate within an IC?
Options- A. repair the gate
- B. resolder the tracks
- C. replace the IC involved
- D. recheck the power source Discuss
- 2. The use of triggered sweep when using an oscilloscope provides more accuracy in which area?
Options- A. frequency
- B. amplitude
- C. graticule activity
- D. timing Discuss
- 3. The time needed for an output to change as the result of an input change is known as:
Options- A. noise immunity
- B. fanout
- C. propagation delay
- D. rise time Discuss
- 4. The range of a valid LOW input is:
Options- A. 0.0 V to 0.4 V
- B. 0.4 V to 0.8 V
- C. 0.4 V to 1.8 V
- D. 0.4 V to 2.4 V Discuss
- 5. A digital logic device used as a buffer should have what input/output characteristics?
Options- A. high input impedance and high output impedance
- B. low input impedance and high output impedance
- C. low input impedance and low output impedance
- D. high input impedance and low output impedance Discuss
- 6. Measurement of pulse width should be taken at a 50% mean of the:
Options- A. overshoot and undershoot
- B. rise and fall
- C. damping and ringing
- D. leading and trailing amplitude Discuss
- 7. A logic probe is placed on the output of a gate and the display indicator is dim. A logic pulser is used on each of the input terminals, but the output indication does not change. What is wrong?
Options- A. The dim indication on the logic probe indicates that the supply voltage is probably low.
- B. The output of the gate appears to be open.
- C. The LOW indication is the result of a bad ground connection on the logic probe.
- D. The gate is a tri-state device. Discuss
- 8. The duty cycle of a pulse is determined by which formula?
Options- A. Duty Cycle =
- B. Duty Cycle =
- C. Duty Cycle =
- D. Duty Cycle =
Discuss
- 9. The time needed for a pulse to increase from 10% to 90% of its amplitude defines:
Options- A. pulse width
- B. propagation delay
- C. rise time
- D. duty cycle Discuss
- 10. The determination of a digital signal's frequency and waveshape is best accomplished with which test equipment?
Options- A. an oscilloscope
- B. a multimeter
- C. a spectrum analyzer
- D. a frequency generator Discuss
Testing and Troubleshooting problems
Search Results
Correct Answer: replace the IC involved
Correct Answer: timing
Correct Answer: propagation delay
Correct Answer: 0.4 V to 0.8 V
Correct Answer: high input impedance and low output impedance
Correct Answer: rise and fall
Correct Answer: The output of the gate appears to be open.
Correct Answer: Duty Cycle =
Correct Answer: rise time
Correct Answer: an oscilloscope
Comments
There are no comments.More in Electronics:
Programming
Copyright ©CuriousTab. All rights reserved.