MCQOPTIONS
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MCQOPTIONS
This section includes 15 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. |
What is the ratio of the capacitive reactance X to the input resistance Rof the input RC circuit of a single-stage BJT amplifier at the low-frequency cutoff? |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.75 |
| D. | 1.0 |
| Answer» E. | |
| 2. |
What is the range of the capacitor C? |
| A. | 0.01 to 0.1 pF |
| B. | 0.1 to 1 pF |
| C. | 0.1 to 1 nF |
| D. | 0.1 to 1 F |
| Answer» C. 0.1 to 1 nF | |
| 3. |
An amplifier rated at 30-W output is connected to a 5- speaker. Calculate the input voltage for the rated output if the amplifier voltage gain is 20 dB. |
| A. | 1.225 mV |
| B. | 12.25 mV |
| C. | 122.5 mV |
| D. | 1.225 V |
| Answer» E. | |
| 4. |
A 3-dB drop in h will occur at a frequency defined by ________. |
| A. | 1 |
| B. | 2 |
| Answer» C. | |
| 5. |
An amplifier rated at 30-W output is connected to a 5- speaker. Calculate the input power required for full power output if the power gain is 20 dB. |
| A. | 3 mW |
| B. | 30 mW |
| C. | 300 mW |
| D. | 3 W |
| Answer» D. 3 W | |
| 6. |
The input power to a device is 10,000 W at 1000 V. The output power is 500 W, and the output impedance is 100 . Find the voltage gain in decibels. |
| A. | –30.01 dB |
| B. | –20.0 dB |
| C. | –13.01 dB |
| D. | –3.01 dB |
| Answer» D. –3.01 dB | |
| 7. |
What is the range of the capacitors C and C? |
| A. | 1 to 10 pF |
| B. | 1 to 10 nF |
| C. | 1 to 10 F |
| D. | 1 to 10 F |
| Answer» B. 1 to 10 nF | |
| 8. |
Which of the low-frequency cutoffs determined by C, C, or C will be the predominant factor in determining the low-frequency response for the complete system? |
| A. | lowest |
| B. | middle |
| C. | highest |
| D. | None of the above |
| Answer» D. None of the above | |
| 9. |
Which of the following capacitors is (are) included in C for the high-frequency region of a BJT or FET amplifier? |
| A. | Input wiring capacitance |
| B. | The transition capacitance ( |
| C. | ) |
| D. | Miller capacitance |
| E. | All of the above |
| Answer» E. All of the above | |
| 10. |
loga = ________ log10 |
| A. | 2.3 |
| B. | 2.718 |
| C. | e |
| D. | 1.414 |
| Answer» B. 2.718 | |
| 11. |
In the hybrid or Giacoletto model, which one of the following does r include? |
| A. | Base spreading resistance |
| B. | Base contact |
| C. | Base bulk |
| D. | All of the above |
| Answer» E. | |
| 12. |
At very high frequencies, the effect of C is to ________ the total impedance of the parallel combination of R, R, R, and C. |
| A. | increase |
| B. | maintain |
| C. | decrease |
| D. | None of the above |
| Answer» D. None of the above | |
| 13. |
In the low-frequency region, the ________ low-frequency cutoff determined by C, C, or C will have the greatest impact on the network. |
| A. | highest |
| B. | average |
| C. | lowest |
| D. | None of the above |
| Answer» B. average | |
| 14. |
is ________ than in a common-base configuration. |
| A. | significantly smaller |
| B. | smaller |
| C. | significantly greater |
| D. | None of the above |
| Answer» D. None of the above | |
| 15. |
With a BJT amplifier in the high-frequency region, the capacitance C is the ________ of the parasitic capacitances while C is the ________. |
| A. | smallest, largest |
| B. | largest, smallest |
| C. | smallest, medium |
| D. | None of the above |
| Answer» C. smallest, medium | |