MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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. | |
| 2. |
The PUT (programmable unijunction transistor) is actually a type of: |
| A. | UJT thyristor |
| B. | FET device |
| C. | TRIAC |
| D. | SCR |
| Answer» B. FET device | |
| 3. |
A transducer's function is to: |
| A. | transmit electrical energy |
| B. | convert energy |
| C. | produce mechanical energy |
| D. | prevent current flow |
| Answer» C. produce mechanical energy | |
| 4. |
The smallest amount of current that the cathode-anode can have, and still sustain conduction of an SCR is called the: |
| A. | maximum forward current |
| B. | maximum forward gate current |
| C. | holding current |
| D. | reverse gate leakage current |
| Answer» E. | |
| 5. |
A UJT has: |
| A. | two base leads |
| B. | one emitter lead |
| C. | two emitter leads and one base lead |
| D. | one emitter lead and two base leads |
| Answer» E. | |
| 6. |
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. | |
| 7. |
What is the difference between mnemonic codes and machine codes? |
| A. | There is no difference. |
| B. | Machine codes are in binary, mnemonic codes are in shorthand English. |
| C. | Machine codes are in shorthand English, mnemonic codes are in binary. |
| D. | Machine codes are in shorthand English, mnemonic codes are a high-level language. |
| Answer» C. Machine codes are in shorthand English, mnemonic codes are in binary. | |
| 8. |
A microprocessor unit, a memory unit, and an input/output unit form a: |
| A. | CPU |
| B. | compiler |
| C. | microcomputer |
| D. | ALU |
| Answer» D. ALU | |
| 9. |
What type of register would shift a complete binary number in one bit at a time and shift all the stored bits out one bit at a time? |
| A. | PIPO |
| B. | SISO |
| C. | SIPO |
| D. | PISO |
| Answer» C. SIPO | |
| 10. |
Synchronous counters eliminate the delay problems encountered with asynchronous (ripple) counters because the: |
| A. | input clock pulses are applied only to the first and last stages |
| B. | input clock pulses are applied only to the last stage |
| C. | input clock pulses are not used to activate any of the counter stages |
| D. | input clock pulses are applied simultaneously to each stage |
| Answer» E. | |
| 11. |
One of the major drawbacks to the use of asynchronous counters is that: |
| A. | low-frequency applications are limited because of internal propagation delays |
| B. | high-frequency applications are limited because of internal propagation delays |
| C. | Asynchronous counters do not have major drawbacks and are suitable for use in high- and low-frequency counting applications. |
| D. | Asynchronous counters do not have propagation delays, which limits their use in high-frequency applications. |
| Answer» C. Asynchronous counters do not have major drawbacks and are suitable for use in high- and low-frequency counting applications. | |
| 12. |
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 | |
| 13. |
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. | |
| 14. |
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. | |
| 15. |
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 | |
| 16. |
What does a hall effect sensor sense? |
| A. | temperature |
| B. | moisture |
| C. | magnetic fields |
| D. | pressure |
| Answer» D. pressure | |
| 17. |
What causes the piezoelectric effect? |
| A. | heat or dissimilar metals |
| B. | pressure on a crystal |
| C. | water running on iron |
| D. | a magnetic field |
| Answer» C. water running on iron | |
| 18. |
Which is the DIAC? |
| A. | <img src="/_files/images/basic-electronics/complete/mca14_10012a1.gif" alt="mca14_10012a1.gif"> |
| B. | <img src="/_files/images/basic-electronics/complete/mca14_10012b1.gif" alt="mca14_10012b1.gif"> |
| C. | <img src="/_files/images/basic-electronics/complete/mca14_10012c1.gif" alt="mca14_10012c1.gif"> |
| D. | <img src="/_files/images/basic-electronics/complete/mca14_10012d1.gif" alt="mca14_10012d1.gif"> |
| Answer» B. <img src="/_files/images/basic-electronics/complete/mca14_10012b1.gif" alt="mca14_10012b1.gif"> | |
| 19. |
Intrinsic semiconductor material is characterized by a valence shell of how many electrons? |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 20. |
Ionization within a P-N junction causes a layer on each side of the barrier called the: |
| A. | junction |
| B. | depletion region |
| C. | barrier voltage |
| D. | forward voltage |
| Answer» C. barrier voltage | |
| 21. |
What is the most significant development in electronics since World War II? |
| A. | the development of color TV |
| B. | the development of the diode |
| C. | the development of the transistor |
| D. | the development of the TRIAC |
| Answer» D. the development of the TRIAC | |
| 22. |
What causes the depletion region? |
| A. | doping |
| B. | diffusion |
| C. | barrier potential |
| D. | ions |
| Answer» C. barrier potential | |
| 23. |
What is an energy gap? |
| A. | the space between two orbital shells |
| B. | the energy equal to the energy acquired by an electron passing a 1 V electric field |
| C. | the energy band in which electrons can move freely |
| D. | an energy level at which an electron can exist |
| Answer» B. the energy equal to the energy acquired by an electron passing a 1 V electric field | |
| 24. |
With full-wave rectification, current through the load resistor must be: |
| A. | in opposite directions |
| B. | to the external load |
| C. | from the reverse biased diode |
| D. | in the same direction |
| Answer» E. | |
| 25. |
A characteristic curve is the result of a current versus voltage plot of diode activity, which begins at the: |
| A. | 3rd quadrant |
| B. | current plot |
| C. | graph origin |
| D. | voltage plot |
| Answer» D. voltage plot | |
| 26. |
When a diode is forward biased, the voltage across it |
| A. | is directly proportional to the current |
| B. | is inversely proportional to the current |
| C. | is directly proportional to the source voltage |
| D. | remains approximately the same |
| Answer» E. | |
| 27. |
Why is heat produced in a diode? |
| A. | due to current passing through the diode |
| B. | due to voltage across the diode |
| C. | due to the power rating of the diode |
| D. | due to the PN junction of the diode |
| Answer» B. due to voltage across the diode | |
| 28. |
The diode schematic arrow points to the: |
| A. | trivalent-doped material |
| B. | positive axial lead |
| C. | anode lead |
| D. | cathode lead |
| Answer» E. | |
| 29. |
When checking a diode, low resistance readings both ways indicate the diode is: |
| A. | open |
| B. | satisfactory |
| C. | faulty |
| D. | not the problem |
| Answer» D. not the problem | |
| 30. |
Electrons in the outermost orbit or shell of an atom are called |
| A. | free electrons |
| B. | negative ions |
| C. | valence electrons |
| D. | conduction band electrons |
| Answer» D. conduction band electrons | |
| 31. |
Shunting the ac component away from the load is the task of a: |
| A. | transformer |
| B. | filter |
| C. | regulator |
| D. | rectifier |
| Answer» C. regulator | |
| 32. |
What is the current through the zener diode? |
| A. | 0 mA |
| B. | 7 mA |
| C. | 8.3 mA |
| D. | 13 mA |
| Answer» C. 8.3 mA | |
| 33. |
A diode for which you can change the reverse bias, and thus vary the capacitance is called a |
| A. | varactor diode |
| B. | tunnel diode |
| C. | zener diode |
| D. | switching diode |
| Answer» B. tunnel diode | |
| 34. |
A filtered full-wave rectifier voltage has a smaller ripple than does a half-wave rectifier voltage for the same load resistance and capacitor values because: |
| A. | there is a shorter time between peaks |
| B. | there is a longer time between peaks |
| C. | the larger the ripple, the better the filtering action |
| D. | none of the above |
| Answer» B. there is a longer time between peaks | |
| 35. |
Testing a good diode with an ohmmeter should indicate |
| A. | high resistance when forward or reverse biased |
| B. | low resistance when forward or reverse biased |
| C. | high resistance when reverse biased and low resistance when forward biased |
| D. | high resistance when forward biased and low resistance when reverse biased |
| Answer» D. high resistance when forward biased and low resistance when reverse biased | |
| 36. |
The peak inverse voltage (PIV) across a nonconducting diode in a bridge rectifier equals approximately: |
| A. | half the peak secondary voltage |
| B. | twice the peak secondary voltage |
| C. | the peak value of the secondary voltage |
| D. | four times the peak value of the secondary voltage |
| Answer» D. four times the peak value of the secondary voltage | |
| 37. |
If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what? |
| A. | Common-mode |
| B. | Single-ended |
| C. | Double-ended |
| D. | Noninverting mode |
| Answer» C. Double-ended | |
| 38. |
If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value? |
| A. | 7.82 V |
| B. | saturation |
| C. | cutoff |
| D. | 9.52 V |
| Answer» E. | |
| 39. |
In an open-loop op-amp circuit, whenever the inverting input ( ) is negative relative to the noninverting input (+), the output will: |
| A. | swing negative |
| B. | close the loop |
| C. | be balanced |
| D. | swing positive |
| Answer» E. | |
| 40. |
What is the difference between common-mode and differential-mode input signals? |
| A. | phase relationship |
| B. | voltage |
| C. | current |
| D. | apparent power |
| Answer» B. voltage | |
| 41. |
The common-mode voltage gain is |
| A. | smaller than differential voltage gain |
| B. | equal to voltage gain |
| C. | greater than differential voltage gain |
| D. | None of the above |
| Answer» B. equal to voltage gain | |
| 42. |
How many logic states does an S-R flip-flop have? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 43. |
An output that is proportional to the addition of two or more inputs is from which type of amplifier? |
| A. | differentiator |
| B. | difference |
| C. | summing |
| D. | analog subtractor |
| Answer» D. analog subtractor | |
| 44. |
In a PLL, to obtain lock, the signal frequency must: |
| A. | come within the lock range |
| B. | be less than the capture frequency |
| C. | come within the capture range |
| D. | be greater than the capture frequency |
| Answer» D. be greater than the capture frequency | |
| 45. |
An ideal amplifier should have: |
| A. | high input current |
| B. | zero offset |
| C. | high output impedance |
| D. | moderate gain |
| Answer» C. high output impedance | |
| 46. |
The Schmitt trigger is a two-state device that is used for: |
| A. | pulse shaping |
| B. | peak detection |
| C. | input noise rejection |
| D. | filtering |
| Answer» B. peak detection | |
| 47. |
When a capacitor is used in place of a resistor in an op-amp network, its placement determines: |
| A. | open- or closed-loop gain |
| B. | integration or differentiation |
| C. | saturation or cutoff |
| D. | addition or subtraction |
| Answer» C. saturation or cutoff | |
| 48. |
All of the following are basic op-amp input modes of operation EXCEPT |
| A. | inverting mode |
| B. | common-mode |
| C. | double-ended |
| D. | single-ended |
| Answer» B. common-mode | |
| 49. |
What is the output voltage? |
| A. | 15 V |
| B. | 5 V |
| C. | 5 V |
| D. | 15 V |
| Answer» D. 15 V | |
| 50. |
How many leads does the TO-5 metal can package of an operational amplifier have? |
| A. | 8, 10, or 12 |
| B. | 6, 8, or 10 |
| C. | 8 or 14 |
| D. | 8 or 16 |
| Answer» B. 6, 8, or 10 | |