MCQOPTIONS
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MCQOPTIONS
This section includes 64 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
As the junction temperature increases, the voltage breakdown point for Zener mechanism ___________ |
| A. | Is increased |
| B. | Is decreased |
| C. | Remains the same |
| D. | None of the above |
| Answer» C. Remains the same | |
| 52. |
The rupture of covalent bonds will occur when the electric field is ___________ |
| A. | 100 V/cm |
| B. | 0.6 V/cm |
| C. | 1000 V/cm |
| D. | More than 10⁵ V/cm |
| Answer» E. | |
| 53. |
A 30 V Zener will have depletion layer width ___________ that of 10 V Zener |
| A. | More than |
| B. | Less than |
| C. | Equal to |
| D. | None of the above |
| Answer» B. Less than | |
| 54. |
An ideal regulated power supply is one which has voltage regulation of ___________ |
| A. | 0% |
| B. | 5% |
| C. | 10% |
| D. | 1% |
| Answer» B. 5% | |
| 55. |
If the doping level is increased, the breakdown voltage of the Zener ___________ |
| A. | Remains the same |
| B. | Is increased |
| C. | Is decreased |
| D. | None of the above |
| Answer» D. None of the above | |
| 56. |
In a 15 V Zener diode , the breakdown mechanism will occur by ___________ |
| A. | Avalanche mechanism |
| B. | Zener mechanism |
| C. | Both Zener and avalanche mechanism |
| D. | None of the above |
| Answer» B. Zener mechanism | |
| 57. |
If the load resistance decreases in a Zener regulator, then Zener current ___________ |
| A. | Decreases |
| B. | Stays the same |
| C. | Increases |
| D. | None of the above |
| Answer» B. Stays the same | |
| 58. |
In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance? |
| A. | 10 Ω |
| B. | 50 Ω |
| C. | 25 Ω |
| D. | 40 Ω |
| Answer» C. 25 ≈í¬© | |
| 59. |
A Zener diode ___________ |
| A. | Is a battery |
| B. | Acts like a battery in the breakdown region |
| C. | Has a barrier potential of 1 V |
| D. | Is forward biased |
| Answer» C. Has a barrier potential of 1 V | |
| 60. |
If the load current drawn by unregulated power supply increases, the d.c. output voltage ___________ |
| A. | Increases |
| B. | Decreases |
| C. | Stays the same |
| D. | None of the above |
| Answer» C. Stays the same | |
| 61. |
Two similar 15 V Zeners are connected in series. What is the regulated output voltage? |
| A. | 15 V |
| B. | 5 V |
| C. | 30 V |
| D. | 45 V |
| Answer» D. 45 V | |
| 62. |
Commercial power supplies have voltage regulation ___________ |
| A. | of 10% |
| B. | of 15% |
| C. | of 25% |
| D. | within 1% |
| Answer» E. | |
| 63. |
Which of these is the best description for a Zener diode? |
| A. | It is a diode |
| B. | It is a constant current device |
| C. | It is a constant-voltage device |
| D. | It works in the forward region |
| Answer» D. It works in the forward region | |
| 64. |
A Zener voltage regulator will cease to act as a voltage regulator if Zener current becomes ___________ |
| A. | Less than load current |
| B. | Zero |
| C. | More than load current |
| D. | None of the above |
| Answer» C. More than load current | |