MCQOPTIONS
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MCQOPTIONS
This section includes 26 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An internal logic gate that shorts to either +V or ground will cause the inputs or output to be stuck either LOW or FLOATING. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Erratic or unexplained digital circuit activity is often due to _________. |
| A. | a glitch |
| B. | a random pulse |
| C. | clock frequency changes |
| D. | a change in slew rate |
| Answer» D. a change in slew rate | |
| 3. |
The device that would best aid in open track detection is a(n) ________. |
| A. | multimeter |
| B. | current tracer |
| C. | logic probe |
| D. | oscilloscope |
| Answer» C. logic probe | |
| 4. |
A check of all power supply voltages should be made during the ________ method of troubleshooting. |
| A. | half-split |
| B. | diagnosis |
| C. | repair |
| D. | final test |
| Answer» B. diagnosis | |
| 5. |
What is the next step after discovering a faulty gate within an IC? |
| A. | repair the gate |
| B. | resolder the tracks |
| C. | replace the IC involved |
| D. | recheck the power source |
| Answer» D. recheck the power source | |
| 6. |
The time interval between the start of two consecutive pulses is called pulse repetition time. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 7. |
The results of internal IC failures will usually be noticed during the ______ phase of troubleshooting. |
| A. | diagnostic |
| B. | isolation |
| C. | repair |
| D. | final test |
| Answer» B. isolation | |
| 8. |
The duty cycle of a pulse is determined by which formula? |
| A. | Duty Cycle = |
| B. | Duty Cycle = |
| C. | Duty Cycle = |
| D. | Duty Cycle = |
| Answer» B. Duty Cycle = | |
| 9. |
The control of digital circuits is usually achieved with _________. |
| A. | random pulses |
| B. | clock signals |
| C. | sophisticated gating |
| D. | selected frequencies |
| Answer» C. sophisticated gating | |
| 10. |
Which device would best aid in shorted track detection? |
| A. | multimeter |
| B. | current tracer |
| C. | logic pulser |
| D. | oscilloscope |
| Answer» C. logic pulser | |
| 11. |
The use of a multimeter with digital circuits allows the measurement of: |
| A. | pulse width |
| B. | voltage or resistance |
| C. | current |
| D. | pulse trains |
| Answer» C. current | |
| 12. |
In order for a logic probe to operate, its red and black leads must first be connected to a ________. |
| A. | logic clip |
| B. | HIGH or TRUE signal |
| C. | power source |
| D. | logic pulser |
| Answer» D. logic pulser | |
| 13. |
The use of triggered sweep when using an oscilloscope provides more accuracy in which area? |
| A. | frequency |
| B. | amplitude |
| C. | graticule activity |
| D. | timing |
| Answer» E. | |
| 14. |
An internal logic gate that shorts to either +VCC or ground will cause the inputs or output to be stuck either LOW or FLOATING. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 15. |
The use of a logic probe may be improved through the use of a(n) ________. |
| A. | logic clip |
| B. | frequency counter |
| C. | oscilloscope |
| D. | current tracer |
| Answer» B. frequency counter | |
| 16. |
The ideal test equipment to use for locating shorts in digital circuitry is the ________ and _______. |
| A. | logic probe, clip |
| B. | logic pulser, logic probe |
| C. | current tracer, logic pulser |
| D. | current tracer, logic clip |
| Answer» D. current tracer, logic clip | |
| 17. |
A noise problem in a digital circuit is often called a glitch. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 18. |
Which test equipment best allows a comparison between input and output signals? |
| A. | an oscilloscope |
| B. | a logic probe |
| C. | a spectrum analyzer |
| D. | a multitrace oscilloscope |
| Answer» E. | |
| 19. |
The determination of a digital signal's frequency and waveshape is best accomplished with which test equipment? |
| A. | an oscilloscope |
| B. | a multimeter |
| C. | a spectrum analyzer |
| D. | a frequency generator |
| Answer» B. a multimeter | |
| 20. |
"Train" and "single" is the mode selection for a _______. |
| A. | multimeter |
| B. | logic probe |
| C. | current tracer |
| D. | logic pulser |
| Answer» E. | |
| 21. |
Measurement of pulse width should be taken at a 50% mean of the: |
| A. | overshoot and undershoot |
| B. | rise and fall |
| C. | damping and ringing |
| D. | leading and trailing amplitude |
| Answer» C. damping and ringing | |
| 22. |
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? |
| 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. |
| Answer» C. The LOW indication is the result of a bad ground connection on the logic probe. | |
| 23. |
The time needed for a pulse to increase from 10% to 90% of its amplitude defines: |
| A. | pulse width |
| B. | propagation delay |
| C. | rise time |
| D. | duty cycle |
| Answer» D. duty cycle | |
| 24. |
A +5 V PCB power source that has been "pulled down" to a +3.4 V level may be due to: |
| A. | a circuit open |
| B. | a faulty regulator |
| C. | the half-split method |
| D. | a circuit short |
| Answer» E. | |
| 25. |
The three basic steps for fixing a failure are ISOLATE, DIAGNOSE, and REPAIR. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 26. |
A series of gradually decreasing sine wave oscillations is called: |
| A. | ringing |
| B. | slew |
| C. | overshooting |
| D. | undershooting |
| Answer» B. slew | |