MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Where does degeneration take place in a self – alpha cutoff frequency? |
| A. | Across RB |
| B. | Across RE |
| C. | No degeneration occurs |
| D. | Across RC |
| Answer» C. No degeneration occurs | |
| 2. |
Collector base feedback and emitter feedback combined together provide stability for self – alpha cutoff frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
What is the stability factor if RE = 8kΩ and RTH = 11kΩ during alpha cutoff frequency? |
| A. | 1.335 |
| B. | 2.375 |
| C. | 1.727 |
| D. | 0.272 |
| Answer» C. 1.727 | |
| 4. |
What values of VBE and α would provide maximum stability? |
| A. | VBE = 5V, α = 50 |
| B. | VBE = 4V, α = 100 |
| C. | VBE = 4.5V, α = 50 |
| D. | It is irrelevant |
| Answer» E. | |
| 5. |
In an ideal stable self – alpha cutoff frequency, what should be the current IBwith respect to IC? |
| A. | IB should be 20% of IC |
| B. | IB should be 5% of IC |
| C. | IB should be 10% of IC |
| D. | IB should be 50% of IC |
| Answer» D. IB should be 50% of IC | |
| 6. |
Why is it essential to stabilize the operating point of a circuit? |
| A. | Thermal runaway, power efficiency, individual variations |
| B. | Temperature dependency of IB, individual variations, power efficiency |
| C. | Thermal runaway, Temperature dependency of IC, individual variations |
| D. | Temperature dependency of IC, thermal runaway, cost efficiency |
| Answer» D. Temperature dependency of IC, thermal runaway, cost efficiency | |
| 7. |
In the circuit given below, assume VCC = 4V, VBB = 5V, VBE = 0.7V, RE = 3.3kΩ, RC = 10kΩ, RB = 40kΩ and α = 100. What is the current IE? |
| A. | 1.388mA |
| B. | 0.012mA |
| C. | 10.47mA |
| D. | 1.165mA |
| Answer» B. 0.012mA | |
| 8. |
Why do we require RE for a good stable alpha cutoff frequency? |
| A. | To obtain a current IE sensitive to α and VBE |
| B. | To obtain a current IB sensitive to α and VBE |
| C. | To obtain a current IE insensitive to α and VBE |
| D. | To obtain a current IB insensitive to α and VBE |
| Answer» D. To obtain a current IB insensitive to α and VBE | |
| 9. |
How many main types of alpha cutoff frequency are there in bipolar transistors? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 10. |
What is the function of an alpha cutoff frequency? |
| A. | To simplify the circuit |
| B. | To provide a non – linear output |
| C. | To optimize the power |
| D. | To provide steady current or voltage |
| Answer» E. | |