MCQOPTIONS
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MCQOPTIONS
This section includes 50 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A two-pole active filter produces a roll-off rate of –20 dB/decade. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
For a Wien-bridge oscillator to produce a sustained sine-wave output, the phase shift around the positive feedback loop must be greater than 0°. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
The R/2R ladder is commonly used for D/A converters. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
The output of an op-amp comparator will be zero when the input voltage exceeds the reference voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
An op-amp can be used as a comparator to determine when an input voltage exceeds a certain level. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
An op-amp integrator uses a capacitor as the feedback element. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
The difference between the UTP and the LTP is the hysteresis voltage. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
The output voltage of a summing amplifier is proportional to the sum of the input voltages. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
In an op-amp comparator, when the input voltage exceeds a reference voltage, the voltage output changes state. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
A positive feedback network for hysteresis improves an op-amp comparator's noise immunity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Operational amplifiers are never used as nonlinear devices. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
Bounding allows the output of a comparator to be an unlimited voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
Refer to the given figure. If Vin = 5 V, the rate of change of the output voltage in response to a single pulse input is: |
| A. | 15.2 mV/s |
| B. | 1.52 V/s |
| C. | 1.52 mV/s |
| D. | 15.2 V/s |
| Answer» D. 15.2 V/s | |
| 14. |
Refer to the given figure. Determine the output voltage, VOUT. |
| A. | 1.05 V |
| B. | –0.35 V |
| C. | 0.35 V |
| D. | –1.05 V |
| Answer» B. –0.35 V | |
| 15. |
An op-amp has an open-loop gain of 90,000. Vsat = ±13 V. A differential voltage of 0.1 V p-p is applied between the inputs. What is the output voltage? |
| A. | 13 V |
| B. | –13 V |
| C. | 13 Vp-p |
| D. | 26 Vp-p |
| Answer» E. | |
| 16. |
A zero-level detector is a type of comparator circuit. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 17. |
A two-pole active filter produces a roll-off rate of –20 dB/decade. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 18. |
A Wien-bridge oscillator uses _________. |
| A. | positive feedback |
| B. | negative feedback |
| C. | both types of feedback |
| D. | an LC tank circuit |
| Answer» D. an LC tank circuit | |
| 19. |
For a Wien-bridge oscillator to produce a sustained sine-wave output, the phase shift around the positive feedback loop must be greater than 0°. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 20. |
The given circuit is a two-pole, active ______ filter. |
| A. | high-pass |
| B. | low-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» C. band-pass | |
| 21. |
The ______________ input makes the summing amplifier circuit possible. |
| A. | virtual ground at the noninverting |
| B. | virtual ground at the inverting |
| C. | low-voltage |
| D. | high-voltage |
| Answer» C. low-voltage | |
| 22. |
In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the Acl _______. |
| A. | reduced, equals one |
| B. | reduced, is less than one |
| C. | increased, is more than one |
| D. | increased, is much greater than one |
| Answer» B. reduced, is less than one | |
| 23. |
The effectiveness of a filter in rejecting signals beyond cutoff frequency is a function of the filter roll-off rating. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 24. |
The critical frequency for the active filter in the given circuit is approximately _______. |
| A. | 20.1 kHz |
| B. | 89.3 kHz |
| C. | 14.2 kHz |
| D. | 179 kHz |
| Answer» B. 89.3 kHz | |
| 25. |
A comparator is an example of a(n) |
| A. | active filter |
| B. | current source |
| C. | linear circuit |
| D. | nonlinear circuit |
| Answer» E. | |
| 26. |
The rate of change of the output voltage in the given circuit equals ______. |
| A. | 40 mV/s |
| B. | 5 V/s |
| C. | 0 V/s |
| D. | 40 V/s |
| Answer» E. | |
| 27. |
To operate properly, an oscillator requires an external ac input signal. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 28. |
When used as a comparator, an op-amp is wired in a closed-loop configuration. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 29. |
The ramp voltage at the output of an op-amp integrator |
| A. | increases or decreases at a linear rate |
| B. | increases or decreases exponentially |
| C. | is always increasing and never decreasing |
| D. | is constant |
| Answer» B. increases or decreases exponentially | |
| 30. |
The output voltage of a summing amplifier is proportional to the product of the input voltages. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 31. |
A two-pole high-pass active filter would have a roll-off rate of |
| A. | 40 dB/decade |
| B. | –40 dB/decade |
| C. | 20 dB/decade |
| D. | –20 dB/decade |
| Answer» C. 20 dB/decade | |
| 32. |
In the given circuit, if Rf is reduced to 8 k, the circuit becomes the ______. |
| A. | digital-to-analog converter |
| B. | averaging amplifier |
| C. | scaling adder |
| D. | summing amplifier with gain greater than unity |
| Answer» C. scaling adder | |
| 33. |
In an averaging amplifier, the input resistances are |
| A. | equal to the feedback resistance |
| B. | less than the feedback resistance |
| C. | greater than the feedback resistance |
| D. | unequal |
| Answer» D. unequal | |
| 34. |
A mathematical operation that determines the rate of change of a curve is called __________. |
| A. | differentiation |
| B. | integration |
| C. | curve averaging |
| D. | linear regression |
| Answer» B. integration | |
| 35. |
The control element in a basic shunt voltage regulator is a zener diode. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 36. |
Above the critical frequency (fc) of a low-pass filter, the output voltage gain _______. |
| A. | does not change |
| B. | doubles for every 1 kHz increase in frequency |
| C. | increases |
| D. | decreases |
| Answer» E. | |
| 37. |
When the capacitance in an active high-pass filter increases, the critical frequency decreases. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 38. |
Initially, the closed-loop gain (Acl) of a Wien-bridge oscillator should be |
| A. | Acl < 3 |
| B. | Acl > 3 |
| C. | 0 |
| D. | Acl 1 |
| Answer» C. 0 | |
| 39. |
A mathematical operation for finding the area under the curve of a graph is called __________. |
| A. | differentiation |
| B. | integration |
| C. | curve averaging |
| D. | linear regression |
| Answer» C. curve averaging | |
| 40. |
A basic series regulator has |
| A. | an error detector |
| B. | a load |
| C. | a reference voltage |
| D. | both an error detector and a reference voltage |
| Answer» E. | |
| 41. |
The reference voltage for the comparator in the given circuit equals ______. |
| A. | 0 V |
| B. | +8.8 V |
| C. | +16 V |
| D. | +7.2 V |
| Answer» C. +16 V | |
| 42. |
If the value of resistor Rf in an averaging amplifier circuit is equal to the value of one input resistor divided by the number of inputs, the output will be equal to |
| A. | the average of the individual inputs |
| B. | the inverted sum of the individual inputs |
| C. | the sum of the individual inputs |
| D. | the inverted average of the individual inputs |
| Answer» E. | |
| 43. |
In the given circuit, VIN1 equals ______. |
| A. | +4 V |
| B. | +20 V |
| C. | –4 V |
| D. | –20 V |
| Answer» D. ‚Äì20 V | |
| 44. |
The formula shows that for a given capacitor, if the voltage changes at a constant rate with respect to time, the current will |
| A. | increase |
| B. | decrease |
| C. | be constant |
| D. | decrease logarithmically |
| Answer» D. decrease logarithmically | |
| 45. |
A triangular-wave oscillator can consist of an op-amp comparator, followed by a(n) |
| A. | differentiator |
| B. | amplifier |
| C. | integrator |
| D. | multivibrator |
| Answer» D. multivibrator | |
| 46. |
The feedback component in an op-amp integrator is a capacitor. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 47. |
If the input to a comparator is a sine wave, the output is a |
| A. | ramp voltage |
| B. | sine wave |
| C. | rectangular wave |
| D. | sawtooth wave |
| Answer» D. sawtooth wave | |
| 48. |
A zero-level detector is a |
| A. | comparator with a sine-wave output |
| B. | comparator with a trip point referenced to zero |
| C. | peak detector |
| D. | limiter |
| Answer» C. peak detector | |
| 49. |
A digital-to-analog converter is an application of the |
| A. | scaling adder |
| B. | voltage-to-current converter |
| C. | noninverting amplifier |
| D. | adjustable bandwidth circuit |
| Answer» B. voltage-to-current converter | |
| 50. |
The center frequency of a band-pass filter is always equal to the |
| A. | bandwidth |
| B. | –3 dB frequency |
| C. | bandwidth divided by Q |
| D. | geometric average of the critical frequencies |
| Answer» E. | |