MCQOPTIONS
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MCQOPTIONS
This section includes 194 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The ideal output impedance for an is 0 . |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
The resistors and in an op-amp circuit control ______ . |
| A. | positive feedback and current gain |
| B. | negative feedback and power gain |
| C. | negative feedback and voltage gain |
| D. | open and closed loop gain |
| Answer» D. open and closed loop gain | |
| 3. |
The magnitude of closed-loop voltage gain () of an inverting amplifier equals: |
| A. | the ratio of the input resistance to the feedback resistance |
| B. | the open-loop voltage gain |
| C. | the feedback resistance divided by the input resistance |
| D. | the input resistance |
| Answer» D. the input resistance | |
| 4. |
The open-loop voltage gain () of an op-amp is the |
| A. | external voltage gain the device is capable of |
| B. | internal voltage gain the device is capable of |
| C. | most controlled parameter |
| D. | same as |
| Answer» C. most controlled parameter | |
| 5. |
It takes 4 s for the output voltage of an op-amp to rise from –14 V to +14 V. The of this op-amp is 3.5 V/s. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
If a noninverting amplifier has an R of 1000 ohms and an R of 2.5 kilohms, what is the R voltage when 1.42 mV is applied to the correct input? |
| A. | 3.5 mV |
| B. | ground |
| C. | 1.42 mV |
| D. | 0.56 mV |
| Answer» D. 0.56 mV | |
| 7. |
Input impedance [(I)] of an inverting amplifier is approximately equal to: |
| A. | + |
| B. | – |
| Answer» B. – | |
| 8. |
Current actually flows into or out of a . |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
An has a phase shift of 180° from input to output. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
The amplifier circuit has a fixed voltage gain of approximately 10. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
An inverting amplifier has a phase shift of 180° from input to output. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
It takes 4 s for the output voltage of an op-amp to rise from –14 V to +14 V. The slew rate of this op-amp is 3.5 V/s. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will: |
| A. | not need an input resistor |
| B. | be virtual ground |
| C. | have high reverse current |
| D. | not invert the signal |
| Answer» C. have high reverse current | |
| 14. |
In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will: |
| A. | swing negative |
| B. | close the loop |
| C. | be balanced |
| D. | swing positive |
| Answer» E. | |
| 15. |
Ideally, the value of the CMRR is ________. Practically, the ________ the value of CMRR, the better the circuit operation. |
| A. | zero, smaller |
| B. | infinite, larger |
| C. | zero, larger |
| D. | infinite, smaller |
| Answer» C. zero, larger | |
| 16. |
The common-mode rejection ratio (CMRR) is defined by ________. |
| A. | Ad / Ac |
| B. | Ac / Ad |
| C. | Ad × Ac |
| D. | Ad + Ac |
| Answer» B. Ac / Ad | |
| 17. |
When both input signals are the same, a common signal element due to the two inputs can be defined as the ________ of the two signals. |
| A. | difference |
| B. | sum |
| C. | average of the sum |
| D. | product |
| Answer» D. product | |
| 18. |
The ratio of the unity-gain frequency to the cutoff frequency is numerically equal to the level of ________. |
| A. | CMRR |
| B. | common-mode gain |
| C. | closed-loop gain |
| D. | open-loop gain |
| Answer» D. open-loop gain | |
| 19. |
The output offset voltage is determined by ________. |
| A. | the input offset voltage and input offset current |
| B. | the closed-loop gain |
| C. | both the input offset voltage and the closed-loop gain |
| D. | None of the above |
| Answer» B. the closed-loop gain | |
| 20. |
Inverting amplifier connection is more widely used because it has ________. |
| A. | higher gain |
| B. | better frequency stability |
| C. | unit gain |
| D. | None of the above |
| Answer» E. | |
| 21. |
As the frequency increases, the input impedance of an op-amp ________ and the output impedance ________. |
| A. | increases, increases |
| B. | increases, decreases |
| C. | decreases, decreases |
| D. | decreases, increases |
| Answer» D. decreases, increases | |
| 22. |
As the supply voltage increases, the voltage gain of the circuit ________ and the power consumption ________. |
| A. | increases, increases |
| B. | increases, decreases |
| C. | decreases, decreases |
| D. | decreases, increases |
| Answer» B. increases, decreases | |
| 23. |
The maximum frequency at which an op-amp may operate depends on the ________. |
| A. | bandwidth (BW) |
| B. | slew rate (SR) |
| C. | unity-gain bandwidth |
| D. | All of the above |
| Answer» E. | |
| 24. |
________ is the unit for the slew rate, SR. |
| A. | V/ms |
| B. | ms/V |
| C. | V |
| D. | V/s |
| Answer» B. ms/V | |
| 25. |
The feedback component of an integrator is a(n) ________. |
| A. | resistor |
| B. | capacitor |
| C. | inductor |
| D. | diode |
| Answer» C. inductor | |
| 26. |
The ________ amplifier is the most widely used constant-gain amplifier circuit. |
| A. | inverting |
| B. | noninverting |
| C. | differential |
| D. | None of the above |
| Answer» B. noninverting | |
| 27. |
An ideal op-amp circuit has ________input impedance, ________ output impedance, and ________ voltage gain. |
| A. | zero, infinite, infinite |
| B. | infinite, zero, zero |
| C. | zero, zero, infinite |
| D. | infinite, zero, infinite |
| Answer» E. | |
| 28. |
A ________ differential amplifier is particularly well suited for battery operation due to its low power consumption. |
| A. | BiFET |
| B. | BiMOS |
| C. | CMOS |
| D. | BJT |
| Answer» D. BJT | |
| 29. |
An IC unit containing a differential amplifier built using opposite-type MOSFET transistors is referred to as a ________ circuit. |
| A. | CMOS |
| B. | BiFET |
| C. | BiMOS |
| D. | None of the above |
| Answer» B. BiFET | |
| 30. |
An IC unit containing a differential amplifier built using both bipolar and FET transistors is referred to as a ________ circuit. |
| A. | CMOS |
| B. | BiFET |
| C. | BiMOS |
| D. | None of the above |
| Answer» C. BiMOS | |
| 31. |
If the same input is applied to both inputs, the operation is called ________. |
| A. | double-ended |
| B. | single-ended |
| C. | common-mode |
| D. | All of the above |
| Answer» D. All of the above | |
| 32. |
The main feature of the differential amplifier is the ________ gain when opposite signals are applied to the inputs as compared to the ________ gain resulting from common inputs. |
| A. | very large, large |
| B. | very small, large |
| C. | very small, very large |
| D. | very large, very small |
| Answer» E. | |
| 33. |
If two opposite-polarity input signals are applied, the operation is referred to as ________. |
| A. | double-ended |
| B. | single-ended |
| C. | common-mode |
| D. | All of the above |
| Answer» B. single-ended | |
| 34. |
In a differential amplifier circuit, if an input signal is applied to either input with the other input connected to ground, the operation is referred to as ________. |
| A. | double-ended |
| B. | single-ended |
| C. | common-mode |
| D. | All of the above |
| Answer» C. common-mode | |
| 35. |
In a differential connection, the signals that are opposite at the inputs are ________ amplified, and those that are common to the two inputs are ________ amplified. |
| A. | slightly, slightly |
| B. | slightly, highly |
| C. | highly, highly |
| D. | highly, slightly |
| Answer» E. | |
| 36. |
An input applied to either input terminal will result in ________. |
| A. | outputs from both output terminals, which have opposite polarities |
| B. | outputs from both output terminals, which have the same polarities |
| C. | a single output from one of the output terminals |
| D. | None of the above |
| Answer» B. outputs from both output terminals, which have the same polarities | |
| 37. |
In double-ended (differential) input operation, ________. |
| A. | an input is applied between the two input terminals |
| B. | two separate signals are applied to the input terminals |
| C. | either an input is applied between the two input terminals or two separate signals are applied to the input terminals |
| D. | None of the above |
| Answer» D. None of the above | |
| 38. |
The output signal of an op-amp is ________ out of phase with its input signal connected to the inverting input terminal. |
| A. | 0º |
| B. | 90º |
| C. | 180º |
| D. | 270º |
| Answer» D. 270º | |
| 39. |
An operational amplifier has a ________ input impedance and a ________ output impedance. |
| A. | high, low |
| B. | high, high |
| C. | low, low |
| D. | low, high |
| Answer» B. high, high | |
| 40. |
An operational amplifier is a ________ gain and ________ bandwidth differential amplifier. |
| A. | very low, narrow |
| B. | low, wide |
| C. | medium, narrow |
| D. | very high, wide |
| Answer» E. | |
| 41. |
Calculate the output impedance of an inverting op-amp using the 741 op-amp (ro = 75 , AOL = 200 V/mV) if R1 = 100 and Rf = 1 k. |
| A. | 0.011 |
| B. | 0.00375 |
| C. | 0.0375 |
| D. | 0.375 |
| Answer» C. 0.0375 | |
| 42. |
Calculate the output voltage if R1 = R2 = R3 = 100 , Rf = 1 k, and V1 = V2 = V3 = 50 mV. |
| A. | –1.5 V |
| B. | 1.5 V |
| C. | 0.5 V |
| D. | –0.5 V |
| Answer» B. 1.5 V | |
| 43. |
Calculate the input voltage if R1 = 100 , Rf = 1 k, and Vout = 550 mV. |
| A. | –50 mV |
| B. | –5 mV |
| C. | 550 mV |
| D. | 50 mV |
| Answer» E. | |
| 44. |
Calculate the overall voltage gain of the circuit if R1 = 100 and Rf = 1 k. |
| A. | –1 |
| B. | –10 |
| C. | 11 |
| D. | 9 |
| Answer» D. 9 | |
| 45. |
Calculate the overall voltage gain of the circuit if R1 = 100 and Rf = 1 k. |
| A. | –1 |
| B. | –10 |
| C. | 11 |
| D. | 9 |
| Answer» C. 11 | |
| 46. |
If Rf = R1, the voltage gain is ________. |
| A. | 1 |
| B. | –1 |
| C. | 10 |
| D. | very small |
| Answer» C. 10 | |
| 47. |
When the open-loop gain of an op-amp is reduced by negative feedback, the bandwidth is increased. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 48. |
Open-loop gain is always smaller than closed-loop gain. |
| A. | True |
| B. | False |
| Answer» C. | |
| 49. |
Negative feedback decreases the bandwidth and increases the voltage gain. |
| A. | True |
| B. | False |
| Answer» C. | |
| 50. |
Closed-loop gain is the gain with negative feedback. |
| A. | True |
| B. | False |
| Answer» B. False | |