MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
The loop gain for an ideal operational amplifier with R1 = 10kΩ and R2(negative feedback) = 1MΩ is |
| A. | 20 db |
| B. | 40 db |
| C. | 60 db |
| D. | 80 db |
| Answer» C. 60 db | |
| 2. |
You are provided with an ideal op amp and three 10kΩ resistors. Using series and parallel resistor combinations, how many different inverting-amplifier circuit topologies are possible? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 3. |
The following is a circuit of weighted summer capable of summing coefficients of both sign. The expressions for the output voltage v0 is |
| A. | v0 = v1 (R1/Ra ) (Rc/Rb ) + v1 (Ra/R2 ) (Rc/Rb ) – v1 (Rc/R3 ) – v1 (Rc/R4 ) |
| B. | v0 = – v1 (R1/Ra ) (Rc/Rb ) – v1 (Ra/R2 ) (Rc/Rb ) + v1 (Rc/R3 ) + v1 (Rc/R4 ) |
| C. | v0 = v1 (Ra/R1 ) (Rc/Rb ) + v1 (Ra/R2 ) (Rc/Rb ) – v1 (Rc/R3 ) – v1 (Rc/R4 ) |
| D. | v0 = – v1 (Ra/R1 ) (Rc/Rb ) – v1 (Ra/R2 ) (Rc/Rb ) + v1 (Rc/R3 ) + v1 (Rc/R4 ) |
| Answer» D. v0 = – v1 (Ra/R1 ) (Rc/Rb ) – v1 (Ra/R2 ) (Rc/Rb ) + v1 (Rc/R3 ) + v1 (Rc/R4 ) | |
| 4. |
THE_LOOP_GAIN_FOR_AN_IDEAL_OPERATIONAL_AMPLIFIER_WITH_R1_=_10K‚ÂÀ√≠¬¨¬©_AND_R2(NEGATIVE_FEEDBACK)_=_1M‚ÂÀ√≠¬¨¬©_IS?$# |
| A. | 20 db |
| B. | 40 db |
| C. | 60 db |
| D. | 80 db |
| Answer» C. 60 db | |
| 5. |
In_an_inverting_op-amp_circuit_for_which_the_gain_is_−4_V/V_and_the_total_resistance_used_is_100_kΩ._Then_the_value_of_R1_and_R2_(negative_feedback)$# |
| A. | R<sub>1</sub> = 20KΩ and R<sub>1</sub> = 80KΩ |
| B. | R<sub>1</sub> = 80KΩ and R<sub>1</sub> = 20KΩ |
| C. | R<sub>1</sub> = 40KΩ and R<sub>1</sub> = 60KΩ |
| D. | R<sub>1</sub> = 50KΩ and R<sub>1</sub> = 50KΩ |
| Answer» B. R<sub>1</sub> = 80K‚âà√≠¬¨¬© and R<sub>1</sub> = 20K‚âà√≠¬¨¬© | |
| 6. |
You are provided with an ideal op amp and three 10kΩ resistors. Using series and parallel resistor combinations, how many different inverting-amplifier circuit topologies are possible?# |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 7. |
The advantage of a weighted summer operational amplifier is |
| A. | It is capable of summing various input voltages together |
| B. | Each input signal may be independently adjusted by adjusting the corresponding input resistance |
| C. | If one needs both sign of a voltage signal then two operational amplifiers are needed |
| D. | All of the mentioned |
| Answer» E. | |
| 8. |
The non-inverting closed loop configuration features a high resistance. Therefore in many cases unity gain follower called buffer amplifier is often used to |
| A. | Connect a high resistance source to high resistance load |
| B. | Connect low resistance source to low resistance load |
| C. | Connect low resistance source to a high resistance source |
| D. | Connect high resistance source to a low resistance load |
| Answer» E. | |
| 9. |
The negative feedback causes |
| A. | The voltage between the two input terminals to the very small, ideally zero |
| B. | The voltage between the two input resistance very high, ideally infinite |
| C. | Current flow through the positive input terminal and no current flows through the negative input terminal |
| D. | Both a and c |
| Answer» B. The voltage between the two input resistance very high, ideally infinite | |
| 10. |
For an ideal negative feedback configuration which of the following is true? |
| A. | There is a virtual open circuit between the input terminals |
| B. | The closed loop gain for a negative feedback does not depend only on the external parameters |
| C. | There is a virtual short circuit between the input terminals |
| D. | There is a virtual ground at the negative input terminal |
| Answer» D. There is a virtual ground at the negative input terminal | |
| 11. |
The effect of the inverting configuration is |
| A. | The output signal and the input signal are out of phase by 180<sup>o</sup> |
| B. | The output signal and the input signal are in phase |
| C. | The output phase is leading the input phase by 90<sup>o</sup> |
| D. | The output phase is lagging behind the input phase by 90<sup>o</sup> |
| Answer» B. The output signal and the input signal are in phase | |
| 12. |
When does a resistance provide a negative feedback to an amplifier? |
| A. | Resistance is connected between the positive input terminal and the output terminal |
| B. | Resistance is connected between the negative input terminal and the output terminal |
| C. | Resistance is connected between the input terminals |
| D. | Resistance is connected between the negative input terminal and ground |
| Answer» C. Resistance is connected between the input terminals | |