MCQOPTIONS
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MCQOPTIONS
This section includes 27 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Refer to this figure. Calculate the value of R. |
| A. | 37.7 k |
| B. | 3.77 k |
| C. | 378 |
| D. | 2.25 k |
| Answer» C. 378 | |
| 2. |
Which of the following configurations has an output impedance Z equal to R? |
| A. | Fixed-bias common-emitter |
| B. | Common-emitter voltage-divider with bypass capacitor |
| C. | Common-emitter voltage-divider without bypass capacitor |
| D. | All of the above |
| Answer» E. | |
| 3. |
Refer to this figure. Find the value of R. |
| A. | 420 |
| B. | 50 k |
| C. | 940 |
| D. | 100.8 |
| Answer» C. 940 | |
| 4. |
In an unbypassed emitter bias configuration h replaces ________ in the r model. |
| A. | r |
| B. | r |
| C. | I |
| Answer» D. | |
| 5. |
Which of the following is (are) true regarding the input impedance for frequencies in the midrange 100 kHz of a BJT transistor amplifier? |
| A. | The input impedance is purely resistive. |
| B. | It varies from a few ohms to megohms. |
| C. | An ohmmeter cannot be used to measure the small-signal ac input impedance. |
| D. | All of the above |
| Answer» E. | |
| 6. |
Refer to this figure. If an emitter bypass capacitor was installed, determine the value of R. |
| A. | 416 |
| B. | 5 k |
| C. | 50 k |
| D. | 500 |
| Answer» B. 5 k | |
| 7. |
Refer to this figure. If an emitter bypass capacitor was installed, what would the new A be? |
| A. | 4.96 |
| B. | 125 |
| C. | 398 |
| D. | 600 |
| Answer» E. | |
| 8. |
Refer to this figure. Determine the value of A. |
| A. | 49.6 |
| B. | 5 |
| C. | 100 |
| D. | 595 |
| Answer» C. 100 | |
| 9. |
What is the unit of the parameter h? |
| A. | Volt |
| B. | Ohm |
| C. | Siemen |
| D. | No unit |
| Answer» D. No unit | |
| 10. |
Refer to this figure. Calculate the value of V. |
| A. | 5 V |
| B. | 3.7 V |
| C. | 20 V |
| D. | 3 V |
| Answer» C. 20 V | |
| 11. |
Which of the h-parameters corresponds to r in a common-base configuration? |
| A. | h |
| B. | h |
| C. | h |
| D. | h |
| Answer» B. h | |
| 12. |
Refer to this figure. Find the value of I. |
| A. | 2 mA |
| B. | 4 mA |
| C. | 5 mA |
| D. | 6 mA |
| Answer» E. | |
| 13. |
Which of the following configurations has a voltage gain of –R /r? |
| A. | Fixed-bias common-emitter |
| B. | Common-emitter voltage-divider with bypass capacitor |
| C. | Fixed-bias common-emitter and voltage-divider with bypass capacitor |
| D. | Common-emitter voltage-divider without bypass capacitor |
| Answer» D. Common-emitter voltage-divider without bypass capacitor | |
| 14. |
An emitter-follower amplifier has an input impedance of 107 k. The input signal is 12 mV. The approximate output voltage is (common-collector) |
| A. | 8.92 V |
| B. | 112 mV |
| C. | 12 mV |
| D. | 8.9 mV |
| Answer» D. 8.9 mV | |
| 15. |
Which of the following is (are) true regarding the output impedance for frequencies in the midrange 100 kHz of a BJT transistor amplifier? |
| A. | The output impedance is purely resistive. |
| B. | It varies from a few ohms to more than 2 M |
| C. | . |
| D. | An ohmmeter cannot be used to measure the small-signal ac output impedance. |
| E. | All of the above |
| Answer» E. All of the above | |
| 16. |
What is the limit of the efficiency defined by = P / P? |
| A. | Greater than 1 |
| B. | Less than 1 |
| C. | Always 1 |
| D. | None of the above |
| Answer» C. Always 1 | |
| 17. |
Refer to this figure. Determine the value of V. |
| A. | 20 V |
| B. | 10 V |
| C. | 5 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 18. |
The dc emitter current of a transistor is 8 mA. What is the value of r? |
| A. | 320 |
| B. | 13.3 k |
| C. | 3.125 |
| D. | 5.75 |
| Answer» D. 5.75 | |
| 19. |
In a fixed-bias network, the input signal V is applied to the ________ of the transistor while the output V is off the ________. |
| A. | base, collector |
| B. | base, emitter |
| C. | emitter, collector |
| D. | None of the above |
| Answer» B. base, emitter | |
| 20. |
In an unbypassed emitter-bias configuration ________ replaces r in the hybrid equivalent circuit. |
| A. | h |
| B. | h |
| C. | h |
| D. | h |
| Answer» B. h | |
| 21. |
In a voltage-divider bias configuration, there can be a measurable difference in the results for ________ if the condition r 10R is not satisfied. |
| A. | Z |
| B. | A |
| C. | A |
| D. | All of the above |
| Answer» D. All of the above | |
| 22. |
The level of r is determined by ________. |
| A. | a |
| B. | I |
| C. | I |
| Answer» C. I | |
| 23. |
The ________ the level of R, the ________ the level of ac voltage gain. |
| A. | smaller, higher |
| B. | larger, lower |
| C. | smaller, lower |
| D. | None of the above |
| Answer» D. None of the above | |
| 24. |
________ is slightly affected if the condition r 10R is not satisfied in the analysis of an emitter-follower configuration. |
| A. | Z |
| B. | Z |
| C. | A |
| D. | A |
| Answer» D. A | |
| 25. |
AC current ratios and convert directly from h parameters. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 26. |
Besides the fact that = I/I and = I/I, these quantities are always the same for purposes of small-signal amplification. |
| A. | True |
| B. | False |
| Answer» C. | |
| 27. |
r is temperature dependent. |
| A. | True |
| B. | False |
| Answer» B. False | |