MCQOPTIONS
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MCQOPTIONS
This section includes 98 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A ___ is created when an electron moves from the valence band to the conduction band. |
| A. | hole |
| B. | gap |
| C. | vacancy |
| D. | blank |
| Answer» B. gap | |
| 2. |
The average value of the half-wave rectified output voltage is approximately __________ of V. |
| A. | 31.8% |
| B. | 63.6% |
| C. | 70.7% |
| D. | 100% |
| Answer» B. 63.6% | |
| 3. |
What is the percent of regulation if V = 20 V and V = 19.8 V? |
| A. | 0% |
| B. | 1% |
| C. | .1% |
| D. | 5% |
| Answer» C. .1% | |
| 4. |
The voltage where current may start to flow in a reverse-biased junction is called the |
| A. | breakdown voltage |
| B. | barrier potential |
| C. | forward voltage |
| D. | biasing voltage |
| Answer» B. barrier potential | |
| 5. |
Atoms in a silicon crystal are held together by ___ bonds. |
| A. | crystal |
| B. | chemical |
| C. | electrical |
| D. | covalent |
| Answer» E. | |
| 6. |
___ occurs when a junction is first formed. |
| A. | Recombination |
| B. | Covalent bonding |
| C. | Crystallization |
| D. | Breakdown |
| Answer» B. Covalent bonding | |
| 7. |
a junction allows the flow of majority current. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
The is the small difference of potential created by positive and negative ions on either side of the depletion region. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
is a small reverse current that flows in a photodiode that is receiving no light. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
The area at the junction of -type and -type materials that has lost its is called the |
| A. | barrier potential |
| B. | depletion region |
| C. | region |
| D. | region |
| Answer» C. region | |
| 11. |
At any given time in an piece of semiconductor material at room temperature |
| A. | electrons drift randomly |
| B. | recombination occurs |
| C. | holes are created |
| D. | All of the above |
| Answer» E. | |
| 12. |
If a bridge rectifier is used, it is not necessary to use a transformer. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 13. |
Breakdown voltage and peak inverse voltage are the same. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 14. |
It is not possible to use a half-wave rectifier circuit without a transformer. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 15. |
An electron can move to another atom's orbit only while in the _______. |
| A. | valence band |
| B. | conduction band |
| C. | orbit nearest the nucleus |
| D. | covalent band |
| Answer» C. orbit nearest the nucleus | |
| 16. |
The peak inverse voltage (PIV) for the diode in the give circuit equals ___. |
| A. | 3 V |
| B. | 2.3 V |
| C. | 0 V |
| D. | 6 V |
| Answer» B. 2.3 V | |
| 17. |
Connecting a capacitor filter to the circuit in the given circuit will___. |
| A. | produce a nearly-constant dc voltage |
| B. | reduce the output voltage |
| C. | increase the ripple voltage |
| D. | lower the surge current |
| Answer» B. reduce the output voltage | |
| 18. |
The forward biased characteristics of a zener diode are the same as those of a diode. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 19. |
Doping semiconductive material is the process of putting a small amount of pentavalent or trivalent atoms in with tetravalent atoms. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 20. |
Atoms in a silicon crystal are held together by ___ bonds. |
| A. | crystal |
| B. | chemical |
| C. | electrical |
| D. | covalent |
| Answer» E. | |
| 21. |
The peak output voltage from the circuit in the given circuit equals ___. |
| A. | 3 V |
| B. | 3.7 V |
| C. | 2.3 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 22. |
One of the advantages of using transformer coupling in a half-wave rectifier is that it allows the ac source to be directly connected to the load. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 23. |
The barrier potential is the small difference of potential created by positive and negative ions on either side of the depletion region. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 24. |
A zener diode has a larger breakdown voltage than a diode. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 25. |
Reverse biasing a pn junction allows the flow of majority current. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 26. |
Dark current is a small reverse current that flows in a photodiode that is receiving no light. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 27. |
A zener diode can be tested with an ohmmeter. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 28. |
A pure semiconductor material ___ very well. |
| A. | conducts |
| B. | insulates |
| C. | conducts and insulates |
| D. | neither conducts nor insulates |
| Answer» E. | |
| 29. |
Electrons in the conduction band are the only ones that are included in the electron current flow. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 30. |
The average value of the output voltage from the circuit in the given circuit equals ___. |
| A. | 5.48 V |
| B. | 2.74 V |
| C. | 0 V |
| D. | 6.37 V |
| Answer» B. 2.74 V | |
| 31. |
A diode can be tested with an ohmmeter. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 32. |
A zener diode can be used to provide voltage regulation in a power supply. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 33. |
A common problem with rectifiers is open diodes. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 34. |
___ occurs when a pn junction is first formed. |
| A. | Recombination |
| B. | Covalent bonding |
| C. | Crystallization |
| D. | Breakdown |
| Answer» B. Covalent bonding | |
| 35. |
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 | |
| 36. |
The diode's characteristic curve shows that current increases when voltage increases. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 37. |
The number of electrons in a stable atom is the same as the number of protons in its nucleus. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 38. |
The conduction band is closest to the valence band in |
| A. | semiconductors |
| B. | conductors |
| C. | insulators |
| D. | The distance is the same for all of the above. |
| Answer» B. conductors | |
| 39. |
Special diodes designed to conduct in the reverse direction are called _______________ diodes. |
| A. | zener |
| B. | varactor |
| C. | LED |
| D. | switching |
| Answer» B. varactor | |
| 40. |
A two-diode rectifier will not operate without a _________. |
| A. | center-tapped transformer |
| B. | voltage regulator |
| C. | capacitive filter |
| D. | phase-inverting transformer |
| Answer» B. voltage regulator | |
| 41. |
Rectifier output polarity depends upon: |
| A. | cycles of input |
| B. | capacitor polarity |
| C. | half or full wave |
| D. | diode installation |
| Answer» E. | |
| 42. |
DC power should be connected to forward bias a diode as follows: |
| A. | – anode, + cathode |
| B. | – cathode, – anode |
| C. | + anode, – cathode |
| D. | + cathode, + anode |
| Answer» D. + cathode, + anode | |
| 43. |
Shunting the ac component away from the load is the task of a: |
| A. | transformer |
| B. | filter |
| C. | regulator |
| D. | rectifier |
| Answer» C. regulator | |
| 44. |
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 | |
| 45. |
The PIV rating of a diode in a full-wave bridge rectifier is more than that required for a full-wave center-tapped configuration. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 46. |
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 | |
| 47. |
The characteristic curve for the complex model of a silicon diode shows that |
| A. | the barrier potential is 0 V |
| B. | the barrier potential stays fixed at 0.7 V |
| C. | the barrier potential increases slightly with an increase in current |
| D. | the barrier potential decreases slightly with an increase in current |
| Answer» D. the barrier potential decreases slightly with an increase in current | |
| 48. |
What is the peak output voltage for this half-wave rectifier? |
| A. | 1 V |
| B. | 7.8 V |
| C. | 10.9 V |
| D. | 15.6 V |
| Answer» C. 10.9 V | |
| 49. |
Thermal shutdown occurs in an IC regulator if: |
| A. | power dissipation is too high |
| B. | internal temperature is too high |
| C. | current through the device is too high |
| D. | load resistance increases |
| Answer» C. current through the device is too high | |
| 50. |
An LED can be tested with an ohmmeter. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |