MCQOPTIONS
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MCQOPTIONS
This section includes 78 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A 1,000 V power supply would use_____________ as a filter capacitor? |
| A. | paper capacitor |
| B. | air capacitor |
| C. | mica capacitor |
| D. | electrolytic capacitor |
| Answer» B. air capacitor | |
| 2. |
A 10 V power supply would use ____________ as filter capacitor? |
| A. | paper capacitor |
| B. | mica capacitor |
| C. | electrolytic capacitor |
| D. | air capacitor |
| Answer» D. air capacitor | |
| 3. |
A zener diode is destroyed if it___________ |
| A. | is forward biased |
| B. | is reverse biased |
| C. | carrier more than rated current |
| D. | none of the above |
| Answer» D. none of the above | |
| 4. |
If the PIV rating of a diode is exceeded, ___________ |
| A. | the diode conducts poorly |
| B. | the diode is destroyed |
| C. | the diode behaves like a zener diode |
| D. | none of the above |
| Answer» C. the diode behaves like a zener diode | |
| 5. |
An ideal crystal diode is one which behaves as a perfect ___________ when forward biased. |
| A. | conductor |
| B. | insulator |
| C. | resistance material |
| D. | none of the above |
| Answer» B. insulator | |
| 6. |
The ___________ filter circuit results in the best voltage regulation |
| A. | choke input |
| B. | capacitor input |
| C. | resistance input |
| D. | none of the above |
| Answer» B. capacitor input | |
| 7. |
The doping level in a zener diode is ___________ that of a crystal diode |
| A. | the same as |
| B. | less than |
| C. | more than |
| D. | none of the above |
| Answer» D. none of the above | |
| 8. |
___________ rectifier has the lowest forward resistance |
| A. | solid state |
| B. | vacuum tube |
| C. | gas tube |
| D. | none of the above |
| Answer» B. vacuum tube | |
| 9. |
A zener diode utilizes ___________ characteristics for its operation. |
| A. | forward |
| B. | reverse |
| C. | both forward and reverse |
| D. | none of the above |
| Answer» C. both forward and reverse | |
| 10. |
The leakage current in a crystal diode is due to ___________ |
| A. | minority carriers |
| B. | majority carriers |
| C. | junction capacitance |
| D. | none of the above |
| Answer» B. majority carriers | |
| 11. |
There is a need of transformer for ___________ |
| A. | half-wave rectifier |
| B. | centre-tap full-wave rectifier |
| C. | bridge full-wave rectifier |
| D. | none of the above |
| Answer» C. bridge full-wave rectifier | |
| 12. |
Mains a.c. power is converrted into d.c. power for ___________ |
| A. | lighting purposes |
| B. | heaters |
| C. | using in electronic equipment |
| D. | none of the above |
| Answer» D. none of the above | |
| 13. |
The reverse current in a diode is of the order of ___________ |
| A. | kA |
| B. | mA |
| C. | μA |
| D. | A |
| Answer» D. A | |
| 14. |
A crystal diode has forward resistance of the order of ___________ |
| A. | kΩ |
| B. | Ω |
| C. | MΩ |
| D. | none of the above |
| Answer» C. MΩ | |
| 15. |
The d.c. resistance of a crystal diode is ___________ its a.c. resistance |
| A. | the same as |
| B. | more than |
| C. | less than |
| D. | none of the above |
| Answer» D. none of the above | |
| 16. |
If the temperature of a crystal diode increases, then leakage current ___________ |
| A. | remains the same |
| B. | decreases |
| C. | increases |
| D. | becomes zero |
| Answer» D. becomes zero | |
| 17. |
When the crystal current diode current is large, the bias is ___________ |
| A. | forward |
| B. | inverse |
| C. | poor |
| D. | reverse |
| Answer» B. inverse | |
| 18. |
The PIV rating of a crystal diode is ___________ that of equivalent vacuum diode |
| A. | the same as |
| B. | lower than |
| C. | more than |
| D. | none of the above |
| Answer» C. more than | |
| 19. |
The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ___________ |
| A. | 1 : 1 |
| B. | 100 : 1 |
| C. | 1000 : 1 |
| D. | 40000 : 1 |
| Answer» E. | |
| 20. |
The forward voltage drop across a silicon diode is about ___________ |
| A. | 2.5 V |
| B. | 3 V |
| C. | 10 V |
| D. | 0.7 V |
| Answer» E. | |
| 21. |
A series resistance is connected in the zener circuit to___________ |
| A. | properly reverse bias the zener |
| B. | protect the zener |
| C. | properly forward bias the zener |
| D. | none of the above |
| Answer» C. properly forward bias the zener | |
| 22. |
The knee voltage of a crystal diode is approximately equal to ___________ |
| A. | applied voltage |
| B. | breakdown voltage |
| C. | forward voltage |
| D. | barrier potential |
| Answer» E. | |
| 23. |
When the graph between current through and voltage across a device is a straight line, the device is referred to as ___________ |
| A. | linear |
| B. | active |
| C. | nonlinear |
| D. | passive |
| Answer» B. active | |
| 24. |
The PIV rating of each diode in a bridge rectifier is ___________ that of the equivalent centre-tap rectifier |
| A. | one-half |
| B. | the same as |
| C. | twice |
| D. | four times |
| Answer» B. the same as | |
| 25. |
When a crystal diode is used as a rectifier, the most important consideration is ___________ |
| A. | forward characteristic |
| B. | doping level |
| C. | reverse characteristic |
| D. | PIC rating |
| Answer» E. | |
| 26. |
If the a.c. input to a half-wave rectifier is an r.m.s value of 400/√2 volts, then diode PIV rating is ___________ |
| A. | 400/√2 V |
| B. | 400 V |
| C. | 400 x √2 V |
| D. | none of the above |
| Answer» C. 400 x √2 V | |
| 27. |
A zener diode has ___________ |
| A. | one pn junction |
| B. | two pn junctions |
| C. | three pn junctions |
| D. | none of the above |
| Answer» B. two pn junctions | |
| 28. |
The most widely used rectifier is ___________ |
| A. | half-wave rectifier |
| B. | centre-tap full-wave rectifier |
| C. | bridge full-wave rectifier |
| D. | none of the above |
| Answer» D. none of the above | |
| 29. |
The maximum efficiency of a half-wave rectifier is ___________ |
| A. | 40.6% |
| B. | 81.2% |
| C. | 50% |
| D. | 25% |
| Answer» B. 81.2% | |
| 30. |
The ripple factor of a half-wave rectifier is ___________ |
| A. | 2 |
| B. | 1.21 |
| C. | 2.5 |
| D. | 0.48 |
| Answer» C. 2.5 | |
| 31. |
A 10 V power supply would use ___________ as filter capacitor. |
| A. | paper capacitor |
| B. | mica capacitor |
| C. | electrolytic capacitor |
| D. | air capacitor |
| Answer» D. air capacitor | |
| 32. |
A crystal diode has |
| A. | one pn junction |
| B. | two pn junctions |
| C. | three pn junctions |
| D. | none of the above |
| Answer» B. two pn junctions | |
| 33. |
A crystal diode is a ___________ device |
| A. | non-linear |
| B. | bilateral |
| C. | linear |
| D. | none of the above |
| Answer» B. bilateral | |
| 34. |
A zener diode is always ___________ connected. |
| A. | reverse |
| B. | forward |
| C. | either reverse or forward |
| D. | none of the above |
| Answer» B. forward | |
| 35. |
A half-wave rectifier has an input voltage of 240 V r.m.s. If the step-down transformer has a turns ratio of 8:1, what is the peak load voltage? Ignore diode drop. |
| A. | 27.5 V |
| B. | 86.5 V |
| C. | 30 V |
| D. | 42.5 V |
| Answer» E. | |
| 36. |
A zener diode is used as ___________ |
| A. | an amplifier |
| B. | a voltage regulator |
| C. | a rectifier |
| D. | a multivibrator |
| Answer» C. a rectifier | |
| 37. |
A crystal diode is used as ___________ |
| A. | an amplifier |
| B. | a rectifier |
| C. | an oscillator |
| D. | a voltage regulator |
| Answer» C. an oscillator | |
| 38. |
The disadvantage of a half-wave rectifier is that the___________ |
| A. | components are expensive |
| B. | diodes must have a higher power rating |
| C. | output is difficult to filter |
| D. | none of the above |
| Answer» D. none of the above | |
| 39. |
For the same secondary voltage, the output voltage from a centre-tap rectifier is ___________ than that of bridge rectifier |
| A. | twice |
| B. | thrice |
| C. | four time |
| D. | one-half |
| Answer» E. | |
| 40. |
A zener diode is destroyed if it___________%! |
| A. | is forward biased |
| B. | is reverse biased |
| C. | carrier more than rated current |
| D. | none of the above |
| Answer» D. none of the above | |
| 41. |
If the PIV rating of a diode is exceeded, ___________%! |
| A. | the diode conducts poorly |
| B. | the diode is destroyed |
| C. | the diode behaves like a zener diode |
| D. | none of the above |
| Answer» C. the diode behaves like a zener diode | |
| 42. |
An ideal crystal diode is one which behaves as a perfect ___________ when forward biased.%! |
| A. | conductor |
| B. | insulator |
| C. | resistance material |
| D. | none of the above |
| Answer» B. insulator | |
| 43. |
The ___________ filter circuit results in the best voltage regulation%! |
| A. | choke input |
| B. | capacitor input |
| C. | resistance input |
| D. | none of the above |
| Answer» B. capacitor input | |
| 44. |
*/*_A 10 V power supply would use ___________ as filter capacitor.? |
| A. | paper capacitor |
| B. | mica capacitor |
| C. | electrolytic capacitor |
| D. | air capacitor |
| Answer» D. air capacitor | |
| 45. |
*/*_The PIV rating of a crystal diode is ___________ that of equivalent vacuum diode? |
| A. | the same as |
| B. | lower than |
| C. | more than |
| D. | none of the above |
| Answer» C. more than | |
| 46. |
*/*_There is a need of transformer for ___________? |
| A. | half-wave rectifier |
| B. | centre-tap full-wave rectifier |
| C. | bridge full-wave rectifier |
| D. | none of the above |
| Answer» C. bridge full-wave rectifier | |
| 47. |
*/*_The knee voltage of a crystal diode is approximately equal to ___________? |
| A. | applied voltage |
| B. | breakdown voltage |
| C. | forward voltage |
| D. | barrier potential |
| Answer» E. | |
| 48. |
*/*_A zener diode has ___________? |
| A. | one pn junction |
| B. | two pn junctions |
| C. | three pn junctions |
| D. | none of the above |
| Answer» B. two pn junctions | |
| 49. |
*/*_The doping level in a zener diode is ___________ that of a crystal diode? |
| A. | the same as |
| B. | less than |
| C. | more than |
| D. | none of the above |
| Answer» D. none of the above | |
| 50. |
*/*_The d.c. resistance of a crystal diode is ___________ its a.c. resistance? |
| A. | the same as |
| B. | more than |
| C. | less than |
| D. | none of the above |
| Answer» D. none of the above | |