MCQOPTIONS
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MCQOPTIONS
This section includes 13 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. |
Regarding the negative feedback amplifier, which of the following statements is wrong? |
| A. | Widens the separation between 3db frequency |
| B. | Improves gain stability |
| C. | Increases gain – bandwidth product |
| D. | Reduces distortion |
| Answer» D. Reduces distortion | |
| 2. |
A system has a gain of 80 db without feedback, if the negative feedback is 1/50th. What is the closed loop gain of the system in db with the addition of the negative feedback? |
| A. | 34db |
| B. | 40db |
| C. | 30db |
| D. | 42db |
| Answer» B. 40db | |
| 3. |
What would be the value of feedback voltage in a negative feedback amplifier with A=100; β =0.03 and input signal voltage = 40mv? |
| A. | 0.03V |
| B. | 0.06V |
| C. | 0.09V |
| D. | 0.12V |
| Answer» E. | |
| 4. |
A_SYSTEM_HAS_A_GAIN_OF_80_DB_WITHOUT_FEEDBACK,_IF_THE_NEGATIVE_FEEDBACK_IS_1/50TH._WHAT_IS_THE_CLOSED_LOOP_GAIN_OF_THE_SYSTEM_IN_DB_WITH_THE_ADDITION_OF_THE_NEGATIVE_FEEDBACK??$ |
| A. | 34db |
| B. | 40db |
| C. | 30db |
| D. | 42db |
| Answer» B. 40db | |
| 5. |
Regarding the negative feedback amplifier, which of the following statements is wrong?$ |
| A. | Widens the separation between 3db frequency |
| B. | Improves gain stability |
| C. | Increases gain – bandwidth product |
| D. | Reduces distortion |
| Answer» D. Reduces distortion | |
| 6. |
A feedback circuit usually employs which type of circuit? |
| A. | Resistive |
| B. | Inductive |
| C. | Capacitive |
| D. | Shunt |
| Answer» B. Inductive | |
| 7. |
An ideal OP-Amp Is an ideal ______________ |
| A. | Current controlled current source |
| B. | Current controlled voltage source |
| C. | Voltage controlled voltage source |
| D. | Voltage controlled Current source |
| Answer» D. Voltage controlled Current source | |
| 8. |
Two non-inverting amplifiers, with gain =1 and gain=20 are made using identical operational amplifiers. As compared to the unity gain amplifier, the amplifier with gain=20 has ___________ |
| A. | More input impedance |
| B. | Less negative feedback |
| C. | Less Bandwidth |
| D. | Less input impedance |
| Answer» D. Less input impedance | |
| 9. |
Negative feedback in amplifier _____________ |
| A. | Improves the signal-to-noise ratio at input |
| B. | Improves the signal-to-noise ratio at output |
| C. | Does not improve the signal-to-noise ratio at I/O |
| D. | Reduce Distortion |
| Answer» E. | |
| 10. |
For an ideal voltage amplifier circuit, what should be the value of input resistance? |
| A. | Zero |
| B. | Infinity |
| C. | Unity |
| D. | Unpredictable |
| Answer» C. Unity | |
| 11. |
Which of the following conditions is responsible to drive a low resistance load by the current amplifier circuit? |
| A. | R<sub>o</sub> << R<sub>L</sub> |
| B. | R<sub>o</sub> >> R<sub>L</sub> |
| C. | R<sub>s</sub> >> R<sub>i</sub> |
| D. | R<sub>s</sub> << R<sub>i</sub> |
| Answer» C. R<sub>s</sub> >> R<sub>i</sub> | |
| 12. |
What would be the value of feedback voltage in a negative feedback amplifier with A=100; β =0.03 and input signal voltage = 40mv?$ |
| A. | 0.03V |
| B. | 0.06V |
| C. | 0.09V |
| D. | 0.12V |
| Answer» E. | |
| 13. |
What happens to the non-linear distortion due to the initiation of the negative feedback? |
| A. | level of non- linear distortion increases |
| B. | level of non- linear distortion decreases |
| C. | level of non- linear distortion remains stable |
| D. | level of non-linear distortion changes sinusoidal |
| Answer» C. level of non- linear distortion remains stable | |