MCQOPTIONS
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MCQOPTIONS
This section includes 44 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 ___ oscillator takes advantage of the . |
| A. | crystal |
| B. | Hartley |
| C. | Colpitts |
| Answer» B. Hartley | |
| 2. |
In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the product of × equals_______. |
| A. | reduced, one |
| B. | reduced, less than one |
| C. | increased, more than one |
| D. | increased, much greater than one |
| Answer» B. reduced, less than one | |
| 3. |
approximately equals _______ when a transistor is in saturation. |
| A. | 0.2 V |
| B. | 0.7 V |
| Answer» D. | |
| 4. |
The power gain () of any transistor amplifier circuit equals the ___________. |
| A. | current gain squared |
| B. | current gain times the voltage gain |
| C. | voltage gain times the output resistance |
| D. | current gain plus the voltage gain |
| Answer» C. voltage gain times the output resistance | |
| 5. |
If the drain, source, and channel of a MOSFET are all a -type material, and it operates in both modes, this is an -channel D-MOSFET. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
In an -type JFET, current will flow when a positive voltage is applied to the drain and a negative voltage is applied to the source. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
The of a BJT is the ratio of collector current to emitter current. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
A source follower has a voltage gain () of |
| A. | = |
| B. | = |
| Answer» D. | |
| 9. |
The signal voltage gain of an amplifier, , is defined as: |
| A. | = |
| B. | × |
| Answer» D. | |
| 10. |
The formula used to calculate the approximate ac resistance of the base-emitter diode () is |
| A. | |
| B. | 25 mV × |
| Answer» B. 25 mV × | |
| 11. |
In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the product of Av × B equals_______. |
| A. | reduced, one |
| B. | reduced, less than one |
| C. | increased, more than one |
| D. | increased, much greater than one |
| Answer» B. reduced, less than one | |
| 12. |
The ac input resistance (Rin) of a voltage-divider biased common-emitter amplifier consists of ____________. |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» C. [C]. | |
| 13. |
An essential requirement of a feedback oscillator is a phase shift around the feedback loop of 360°. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
A source follower has a voltage gain (Av) of |
| A. | AV = gmRd |
| B. | AV = gmRS |
| C. | [C]. |
| D. | [D]. |
| Answer» D. [D]. | |
| 15. |
The formula used to calculate the approximate ac resistance of the base-emitter diode (re) is |
| A. | [A]. |
| B. | re 25 mV × IC |
| C. | [C]. |
| D. | [D]. |
| Answer» B. re 25 mV × IC | |
| 16. |
The signal voltage gain of an amplifier, Av, is defined as: |
| A. | [A]. |
| B. | Av = IC × RC |
| C. | [C]. |
| D. | [D]. |
| Answer» D. [D]. | |
| 17. |
The gain of a BJT is called _______ and the gain of a JFET is called _______. |
| A. | beta, alpha |
| B. | transconductance, beta |
| C. | beta, transconductance |
| D. | transconductance, transconductance |
| Answer» D. transconductance, transconductance | |
| 18. |
A decrease in base current of a CE amplifier causes the voltage measured between the emitter and the collector to increase. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 19. |
Changing ________ can control the voltage gain of a common-source amplifier. |
| A. | the input voltage |
| B. | gm |
| C. | VDD |
| D. | RS |
| Answer» C. VDD | |
| 20. |
In an n-type JFET, current will flow when a positive voltage is applied to the drain and a negative voltage is applied to the source. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 21. |
Removing a bypass capacitor from a common-emitter amplifier circuit will _________ voltage gain and ________ input resistance. |
| A. | increase, decrease |
| B. | decrease, increase |
| C. | decrease, decrease |
| D. | increase, increase |
| Answer» C. decrease, decrease | |
| 22. |
An essential requirement of a feedback oscillator is a phase shift around the feedback loop of 360°. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 23. |
The collector current in a class A amplifier flows for ________ of the ac input signal. |
| A. | < 180° |
| B. | 180° |
| C. | < 360° |
| D. | 360° |
| Answer» E. | |
| 24. |
The depletion-mode MOSFET |
| A. | can operate with only positive gate voltages |
| B. | can operate with only negative gate voltages |
| C. | cannot operate in the ohmic region |
| D. | can operate with positive as well as negative gate voltages |
| Answer» E. | |
| 25. |
The beta of a BJT is the ratio of collector current to emitter current. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 26. |
A(n) ___ has a conductive channel only when it is biased properly. |
| A. | p-channel JFET |
| B. | n-channel D-MOSFET |
| C. | p-channel D-MOSFET |
| D. | n-channel E-MOSFET |
| Answer» E. | |
| 27. |
The maximum peak-to-peak output voltage in the given circuit is 15 V. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 28. |
Which of the following conditions are needed to properly bias an npn transistor amplifier? |
| A. | Forward bias the base/emitter junction and reverse bias the base/collector junction. |
| B. | Forward bias the collector/base junction and reverse bias the emitter/base junction. |
| C. | Apply a positive voltage on the n-type material and a negative voltage on the p-type material. |
| D. | Apply a large voltage on the base. |
| Answer» B. Forward bias the collector/base junction and reverse bias the emitter/base junction. | |
| 29. |
The ___ oscillator takes advantage of the piezoelectric effect. |
| A. | crystal |
| B. | Hartley |
| C. | Colpitts |
| D. | RC |
| Answer» B. Hartley | |
| 30. |
The power gain (Ap) of any transistor amplifier circuit equals the ___________. |
| A. | current gain squared |
| B. | current gain times the voltage gain |
| C. | voltage gain times the output resistance |
| D. | current gain plus the voltage gain |
| Answer» C. voltage gain times the output resistance | |
| 31. |
Three different points are shown on a dc load line. The upper point represents the |
| A. | minimum current gain |
| B. | quiescent point |
| C. | saturation point |
| D. | cutoff point |
| Answer» D. cutoff point | |
| 32. |
In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid |
| A. | crossover distortion |
| B. | unusually high efficiency |
| C. | negative feedback |
| D. | a low input impedance |
| Answer» B. unusually high efficiency | |
| 33. |
A certain amplifier has a voltage gain of 210. That gain expressed in decibels is 46.4 dB. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 34. |
VCE approximately equals _______ when a transistor is in saturation. |
| A. | VCC |
| B. | VB |
| C. | 0.2 V |
| D. | 0.7 V |
| Answer» D. 0.7 V | |
| 35. |
Base currents are usually small because of the physical construction of the thin and lightly doped base. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 36. |
A practical CE amplifier has the input on the base and the output taken off the emitter. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 37. |
To get a negative gate-source voltage in a self-biased JFET circuit, you must use a |
| A. | voltage divider |
| B. | source resistor |
| C. | ground |
| D. | negative gate supply voltage |
| Answer» C. ground | |
| 38. |
In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the product of Av √ó B equals_______. |
| A. | reduced, one |
| B. | reduced, less than one |
| C. | increased, more than one |
| D. | increased, much greater than one |
| Answer» B. reduced, less than one | |
| 39. |
In order for feedback oscillators to have any practical value, the gain has to be |
| A. | < 1 |
| B. | self-adjusting |
| C. | stabilized |
| D. | nonlinear |
| Answer» C. stabilized | |
| 40. |
The capacitor that produces an ac ground is called a(n) |
| A. | coupling capacitor |
| B. | dc open |
| C. | bypass capacitor |
| D. | ac open |
| Answer» D. ac open | |
| 41. |
Often a common-collector will be the last stage before the load; the main function of this stage is to |
| A. | provide voltage gain |
| B. | buffer the voltage amplifiers from the low-resistance load |
| C. | provide phase inversion |
| D. | provide a high-frequency path to improve the frequency response |
| Answer» C. provide phase inversion | |
| 42. |
The gate-source junction of a JFET must be ________ for proper linear operation. |
| A. | forward-biased |
| B. | reverse-biased |
| C. | either forward-biased or reverse-biased |
| D. | neutral |
| Answer» C. either forward-biased or reverse-biased | |
| 43. |
If the drain, source, and channel of a MOSFET are all a p-type material, and it operates in both modes, this is an n-channel D-MOSFET. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 44. |
The primary function of the bias circuit is to |
| A. | hold the circuit stable at VCC |
| B. | hold the circuit stable at vin |
| C. | ensure proper gain is achieved |
| D. | hold the circuit stable at the designed Q-point |
| Answer» E. | |