MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The emitter resistor in an emitter-stabilized bias circuit appears to be ________ in the base circuit. |
| A. | larger |
| B. | smaller |
| C. | the same |
| D. | None of the above |
| Answer» B. smaller | |
| 2. |
Ripple voltage is caused by the charging and discharging of the filter capacitor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
For greatest reliability, and longest life, diodes should be operated at their maximum ratings. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
A diode conducts current when reverse-biased and blocks current when forward-biased. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
The combination of a short circuit in series with an open circuit always results in a(n) ________ circuit. |
| A. | open |
| B. | short |
| C. | neither short nor open |
| D. | unknown |
| Answer» B. short | |
| 6. |
The quiescent point (Q-point) is defined by a(n) ________. |
| A. | ac network |
| B. | dc network |
| C. | ac and dc network |
| D. | None of the above |
| Answer» C. ac and dc network | |
| 7. |
A diode is in the ________ state if the current established by the applied sources is such that its direction matches that of the arrow in the diode symbol and VD > 0.7 V. |
| A. | off |
| B. | reverse bias |
| C. | on |
| D. | transition |
| Answer» D. transition | |
| 8. |
When biased as a variable resistor, JFET resistance (RDS) increases as VGS becomes more negative. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
The term bipolar reflects the fact that ________ and ________ participate in the injection process into the oppositely polarized material. |
| A. | holes, neutrons |
| B. | holes, electrons |
| C. | neutrons, electrons |
| D. | None of the above |
| Answer» C. neutrons, electrons | |
| 10. |
An atom is the smallest particle of an element that retains the characteristics of that element. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
A pn structure is called a diode. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
An intrinsic semiconductor is neither a good conductor nor a good insulator. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
The ideal model of a diode is a switch. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
The feedback network in a Colpitts oscillator contains two series capacitors and a parallel inductor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
The positive feedback voltage in an oscillator has no net phase shift. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 16. |
Crystal oscillators are inherently unstable. |
| A. | True |
| B. | False |
| Answer» C. | |
| 17. |
For a Wien-bridge oscillator, resonance occurs when Vout/Vin = 1. |
| A. | True |
| B. | False |
| Answer» C. | |
| 18. |
LC feedback elements are normally used in oscillators for frequencies greater than 1 MHz. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 19. |
An amplifier is stable if the absolute magnitude of A is ________. |
| A. | <img src="/_files/images/electronic-devices-and-circuit-theory/infinity.gif"> |
| B. | less than 1 |
| C. | greater than 1 |
| D. | None of the above |
| Answer» C. greater than 1 | |
| 20. |
Refer to the given figure. This circuit is known as |
| A. | a noninverting amplifier. |
| B. | a differentiator. |
| C. | an integrator. |
| D. | a summing amplifier. |
| Answer» C. an integrator. | |
| 21. |
Refer to the given figure. A square-wave input is applied to this amplifier. The output voltage is most likely to be |
| A. | a square wave. |
| B. | a triangle wave. |
| C. | a sine wave. |
| D. | no output. |
| Answer» C. a sine wave. | |
| 22. |
In a full-wave rectifier, if no load were connected across the capacitor, the output voltage would ideally be a(n) ________. |
| A. | ac voltage |
| B. | constant dc voltage |
| C. | pulsating dc voltage |
| D. | ramp voltage |
| Answer» C. pulsating dc voltage | |
| 23. |
The output of a loaded power supply is ________ that of the unloaded. |
| A. | the same as |
| B. | larger than |
| C. | smaller than |
| D. | None of the above |
| Answer» D. None of the above | |
| 24. |
The filter output voltage of a power supply ________ when load current is drawn from the supply. |
| A. | remains the same |
| B. | is increased |
| C. | is reduced |
| D. | None of the above |
| Answer» D. None of the above | |
| 25. |
The specification sheet for the 7812 fixed positive voltage regulator shows that the output voltage could be as low as ________ or as high as ________. |
| A. | 11.5 V, 12.5 V |
| B. | 11.2 V, 12.2 V |
| C. | 11 V, 13 V |
| D. | 8 V, 15 V |
| Answer» B. 11.2 V, 12.2 V | |
| 26. |
A dc voltmeter reads the ________ while measuring a pulsating dc voltage. |
| A. | ac component of the signal |
| B. | average of the signal |
| C. | peak of the pulsating signal |
| D. | None of the above |
| Answer» C. peak of the pulsating signal | |
| 27. |
The output resulting from a rectifier is a(n) ________. |
| A. | ac voltage |
| B. | pure dc voltage |
| C. | pulsating dc voltage |
| D. | None of the above |
| Answer» D. None of the above | |
| 28. |
In a foldback configuration, limiting the current reduces ________, protecting the load from overcurrent as well as protecting the regulator. |
| A. | the output voltage |
| B. | the output current |
| C. | both the output voltage and output current |
| D. | None of the above |
| Answer» D. None of the above | |
| 29. |
The ripple voltage Vr is a result of the ________. |
| A. | conduction of the diode(s) |
| B. | transformer windings |
| C. | charging and discharging of the capacitor |
| D. | load resistor |
| Answer» D. load resistor | |
| 30. |
Regulator IC units contain the circuitry for the ________. |
| A. | reference source |
| B. | comparator amplifier |
| C. | control device and overload protection |
| D. | All of the above |
| Answer» E. | |
| 31. |
A full-wave rectified signal has ________ dc component and ________ ripple than (as) the half-wave rectified voltage. |
| A. | a larger, more |
| B. | a smaller, less |
| C. | the same, less |
| D. | a larger, less |
| Answer» E. | |
| 32. |
The output of an op-amp comparator will be zero when the input voltage exceeds the reference voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 33. |
A positive feedback network for hysteresis improves an op-amp comparator's noise immunity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 34. |
Load regulation is the percentage change in line voltage for a change in load voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 35. |
A comparator with hysteresis is sometimes known as a(n) |
| A. | integrator. |
| B. | differentiator. |
| C. | Schmitt trigger. |
| D. | none of the above |
| Answer» D. none of the above | |
| 36. |
A three-terminal regulator can be used with an external pass transistor to increase the total load current available. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 37. |
Since the crystal losses represented by R are small, the equivalent crystal Q (quality factor) is ________. |
| A. | very low |
| B. | low |
| C. | medium |
| D. | high |
| Answer» E. | |
| 38. |
In the Colpitts oscillator, the frequency is determined by ________ . |
| A. | resistance only |
| B. | inductance only |
| C. | capacitance only |
| D. | both inductance and a capacitance |
| Answer» E. | |
| 39. |
Typically, a unijunction transistor has a stand-off ratio from ________ to ________. |
| A. | 0.0, 0.2 |
| B. | 0.2, 0.4 |
| C. | 0.4, 0.6 |
| D. | 0.6, 0.8 |
| Answer» D. 0.6, 0.8 | |
| 40. |
The R/2R ladder is commonly used for D/A converters. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 41. |
Bounding allows the output of a comparator to be an unlimited voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 42. |
The difference between the UTP and the LTP is the hysteresis voltage. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 43. |
Crystal oscillators are used whenever a(n) ________ level of stability is required. |
| A. | lower |
| B. | average |
| C. | greater |
| D. | None of the above |
| Answer» D. None of the above | |
| 44. |
An amplifier with negative feedback has ________ bandwidth than (as) the amplifier without feedback. |
| A. | the same |
| B. | less |
| C. | more |
| D. | None of the above |
| Answer» D. None of the above | |
| 45. |
________ is a mathematical process for determining the rate of change of a function. |
| A. | Integration |
| B. | Differentiation |
| C. | Summing |
| D. | Comparatoring |
| Answer» C. Summing | |
| 46. |
An integrator circuit |
| A. | uses a resistor in its feedback circuit. |
| B. | uses an inductor in its feedback circuit. |
| C. | uses a capacitor in its feedback circuit. |
| D. | uses a resistor in its feedback circuit or uses a capacitor in its feedback circuit |
| Answer» D. uses a resistor in its feedback circuit or uses a capacitor in its feedback circuit | |
| 47. |
In a comparator with output bounding, what type of diode is used in the feedback loop? |
| A. | Schottky |
| B. | junction |
| C. | zener |
| D. | varactor |
| Answer» D. varactor | |
| 48. |
Which of the following are variations of the basic summing amplifier? |
| A. | averaging amplifier |
| B. | scaling amplifier |
| C. | both of the above |
| Answer» D. | |
| 49. |
A differentiator is used to measure |
| A. | the sum of the input voltages. |
| B. | the difference between two voltages. |
| C. | the area under a curve. |
| D. | the rate of change of the input voltage. |
| Answer» E. | |
| 50. |
A(n) ________ amplifier is a summing amplifier with a closed-loop gain equal to the reciprocal of the number of inputs. |
| A. | averaging |
| B. | scaling |
| C. | none of the above |
| Answer» B. scaling | |