MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Consider a step graded diode, which has built in voltage 0.7V, and depletion width 2 m. Depletion width is W2 when a reverse bias voltage of 11.3 V is applied. Find W2? |
| A. | 8.28 m |
| B. | 8 m |
| C. | 4.14 m |
| D. | 9.88 m |
| Answer» B. 8 m | |
| 2. |
If the relative permittivity of a diode remains constant, its area is doubled and its doping concentration is quadrupled. What is its new diffusion capacitance, of originally it was CD? |
| A. | 4C<sub>D</sub> |
| B. | 2C<sub>D</sub> |
| C. | 3C<sub>D</sub> |
| D. | C<sub>D</sub> |
| Answer» B. 2C<sub>D</sub> | |
| 3. |
Consider two almost similar diodes, whose diffusion capacitances are C1 and C2, and doping concentrations of 1020 /cubic centimeter and 1016/cubic centimeter. Find ( frac{C1}{C2} ). |
| A. | 100 |
| B. | 0.01 |
| C. | 10000 |
| D. | 0.0001 |
| Answer» C. 10000 | |
| 4. |
The minority charge concentration can be represented as Q = V2 33V. If the voltage being applied is now 5V, find the diffusion capacitance. |
| A. | 1 F |
| B. | 0.1 F |
| C. | 10 F |
| D. | 0.9 F |
| Answer» C. 10 F | |
| 5. |
In a diode, the change in voltage being applied across it is 2V. The change in minority carriers outside the depletion region is 1.2 10-8. Find diffusion capacitance. |
| A. | 6 pF |
| B. | 6 F |
| C. | 1.2 nF |
| D. | 6nF |
| Answer» E. | |
| 6. |
Diffusion capacitance is larger than transition capacitance. |
| A. | True |
| B. | False |
| C. | Both are same |
| D. | Depends on doping concentrations |
| Answer» C. Both are same | |
| 7. |
If the diffusion capacitance is directly proportional only to the lifetime of holes in N side then ________ |
| A. | The diode is a p<sup>+</sup>n junction diode |
| B. | The diode is a pn<sup>+</sup> junction diode |
| C. | The diode is a p<sup>+</sup>n<sup>+</sup> diode |
| D. | The diode can have any type of pn junction |
| Answer» B. The diode is a pn<sup>+</sup> junction diode | |
| 8. |
On which of these does the diffusion capacitance of a diode not depend upon? |
| A. | Forward current |
| B. | Dynamic conductance |
| C. | Doping concentration |
| D. | Reverse resistance |
| Answer» E. | |