MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
What is the maximum efficiency of a class B circuit? |
| A. | 90% |
| B. | 78.5% |
| C. | 40% |
| D. | 50% |
| Answer» C. 40% | |
| 2. |
For BJT power transistors, the collector terminal is always connected to the transistor’s case________ |
| A. | for easy circuit connection |
| B. | to prevent shorts |
| C. | because the collector terminal is the critical terminal for heat dissipation |
| D. | because the collector terminal is located nearest the case |
| Answer» D. because the collector terminal is located nearest the case | |
| 3. |
Calculate the efficiency of a class B amplifier for a supply voltage of VCC = 20 V with peak output voltage of VL(p) = 18 V. Assume RL = 16 . |
| A. | 78.54% |
| B. | 75% |
| C. | 70.69% |
| D. | 50% |
| Answer» D. 50% | |
| 4. |
A class A amplifier with RC = 3.3 k and RE = 1.2 k has a VCC = 20 V. Find IC(sat). |
| A. | 4.4mA |
| B. | 6.1mA |
| C. | 20mA |
| D. | 16.7mA |
| Answer» B. 6.1mA | |
| 5. |
WHAT_IS_THE_MAXIMUM_EFFICIENCY_OF_A_CLASS_B_CIRCUIT??$ |
| A. | 90% |
| B. | 78.5% |
| C. | 40% |
| D. | 50% |
| Answer» C. 40% | |
| 6. |
WHICH_TYPE_OF_AMPLIFIER_USES_PULSE_(DIGITAL)_SIGNALS_IN_ITS_OPERATION??$ |
| A. | Class A |
| B. | Class B or AB |
| C. | Class C |
| D. | Class D |
| Answer» E. | |
| 7. |
Which of the power amplifiers is not suitable as audio amplifiers? |
| A. | Class A |
| B. | Class B |
| C. | Class C |
| D. | Class D |
| Answer» D. Class D | |
| 8. |
Calculate the harmonic distortion component for an output signal having a fundamental amplitude of 3 V and a second harmonic amplitude of 0.25 V. |
| A. | 3.83% |
| B. | 38.3% |
| C. | 83.3% |
| D. | 8.33% |
| Answer» E. | |
| 9. |
Which of the push-pull amplifiers is presently the most popular form of the class B power amplifier? |
| A. | Quasi-complementary |
| B. | Transformer-coupled |
| C. | Complementary-symmetry |
| D. | Symmetry |
| Answer» B. Transformer-coupled | |
| 10. |
Which operation class is generally used in radio or communications? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 11. |
For BJT power transistors, the collector terminal is always connected to the transistor’s case________$ |
| A. | for easy circuit connection |
| B. | to prevent shorts |
| C. | because the collector terminal is the critical terminal for heat dissipation |
| D. | because the collector terminal is located nearest the case |
| Answer» D. because the collector terminal is located nearest the case | |
| 12. |
Calculate the efficiency of a class B amplifier for a supply voltage of VCC = 20 V with peak output voltage of VL(p) = 18 V. Assume RL = 16 . |
| A. | 78.54% |
| B. | 75% |
| C. | 70.69% |
| D. | 50% |
| Answer» D. 50% | |
| 13. |
Which of the power amplifiers has the lowest overall efficiency? |
| A. | Class C |
| B. | Class A |
| C. | Class B or AB |
| D. | Class D |
| Answer» C. Class B or AB | |
| 14. |
A class A amplifier with RC = 3.3 k and RE = 1.2 k has a VCC = 20 V. Find IC(sat). |
| A. | 4.4mA |
| B. | 6.1mA |
| C. | 20mA |
| D. | 16.7mA |
| Answer» B. 6.1mA | |