MCQOPTIONS
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MCQOPTIONS
This section includes 131 Mcqs, each offering curated multiple-choice questions to sharpen your Active Filter Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In a hybrid equivalent circuit, ________ is determined to make it easier to find the other parameters. |
| A. | Zi |
| B. | Zo |
| C. | Ai |
| D. | Av |
| Answer» E. | |
| 2. |
In an unbypassed emitter-bias configuration ________ replaces re in the hybrid equivalent circuit. |
| A. | hie |
| B. | hfe |
| C. | hre |
| D. | hoe |
| Answer» B. hfe | |
| 3. |
The feedback pair uses a(n) ________ transistor driving a(n) ________ transistor, the two devices acting effectively much like one pnp transistor. |
| A. | pnp, npn |
| B. | pnp, pnp |
| C. | npn, npn |
| D. | None of the above |
| Answer» B. pnp, pnp | |
| 4. |
The ac voltage gain of a Darlington connection is about ________. |
| A. | 0 |
| B. | 1 |
| C. | D |
| D. | None of the above |
| Answer» C. D | |
| 5. |
The ________ the source resistance, the ________ the overall gain of an amplifier. |
| A. | larger, higher |
| B. | larger, lower |
| C. | lower, lower |
| D. | None of the above |
| Answer» C. lower, lower | |
| 6. |
The ________ the level of RL, the ________ the level of ac voltage gain. |
| A. | smaller, higher |
| B. | larger, lower |
| C. | smaller, lower |
| D. | None of the above |
| Answer» D. None of the above | |
| 7. |
The dc load line and ac load line both have the same ________ . |
| A. | x-intercept |
| B. | y-intercept |
| C. | slope |
| D. | Q-point |
| Answer» E. | |
| 8. |
The coupling capacitor places the load and collector resistors in a ________ arrangement. |
| A. | series |
| B. | parallel |
| C. | series-parallel |
| D. | None of the above |
| Answer» C. series-parallel | |
| 9. |
Ideally, the changes in the load resistor or the source resistor should have ________ effect on all the parameters of the two-port model. |
| A. | a great |
| B. | a moderate |
| C. | no |
| D. | None of the above |
| Answer» D. None of the above | |
| 10. |
The loaded voltage gain of an amplifier is ________ the no-load level. |
| A. | always more than |
| B. | always less than |
| C. | always the same as |
| D. | None of the above |
| Answer» C. always the same as | |
| 11. |
In a common-base configuration, the input and output voltages are ________ and the output and input currents are ________. |
| A. | 180º out of phase, 180º out of phase |
| B. | 180º out of phase, in phase |
| C. | in phase,180º out of phase |
| D. | in phase, in phase |
| Answer» E. | |
| 12. |
A common-base configuration has ________ impedance at the input and ________ impedance at the output. |
| A. | high, high |
| B. | high, low |
| C. | low, low |
| D. | low, high |
| Answer» E. | |
| 13. |
________ is slightly affected if the condition ro 10RE is not satisfied in the analysis of an emitter-follower configuration. |
| A. | Zi |
| B. | Zo |
| C. | Av |
| D. | Ai |
| Answer» D. Ai | |
| 14. |
In an emitter-follower, the output voltage is ________ with the input voltage. |
| A. | 45º out of phase |
| B. | 90º out of phase |
| C. | 180º out of phase |
| D. | in phase |
| Answer» E. | |
| 15. |
An emitter-follower has ________ impedance at the input and ________ impedance at the output. |
| A. | high, high |
| B. | low, high |
| C. | high, low |
| D. | low, low |
| Answer» D. low, low | |
| 16. |
In an emitter-follower, the voltage gain is ________. |
| A. | slightly less than 1 |
| B. | slightly more than 1 |
| C. | a very large value |
| D. | None of the above |
| Answer» B. slightly more than 1 | |
| 17. |
The bypass capacitor in a common-emitter configuration ________ the voltage gain. |
| A. | significantly decreases |
| B. | significantly increases |
| C. | slightly increases |
| D. | slightly decreases |
| Answer» C. slightly increases | |
| 18. |
In a voltage-divider bias configuration, there can be a measurable difference in the results for ________ if the condition ro 10RC is not satisfied. |
| A. | Zo |
| B. | Av |
| C. | Ai |
| D. | All of the above |
| Answer» D. All of the above | |
| 19. |
In a voltage-divider bias configuration, the voltage-divider equation is used to determine the ________. |
| A. | ac level of Vb |
| B. | dc level of IB |
| C. | dc level of VB |
| D. | ac level of Ib |
| Answer» D. ac level of Ib | |
| 20. |
In a fixed-bias network, the input signal Vi is applied to the ________ of the transistor while the output Vo is off the ________. |
| A. | base, collector |
| B. | base, emitter |
| C. | emitter, collector |
| D. | None of the above |
| Answer» B. base, emitter | |
| 21. |
For the common-emitter and common-base configurations, the magnitude of ________ and ________ is often not included in the model. |
| A. | hr, ho |
| B. | hi, he |
| C. | hi, hr |
| D. | he, ho |
| Answer» B. hi, he | |
| 22. |
________ refers to the forward transfer current ratio. |
| A. | hi |
| B. | hr |
| C. | hf |
| D. | ho |
| Answer» D. ho | |
| 23. |
The level of re is determined by ________. |
| A. | a |
| B. | IE |
| C. | [C]. |
| D. | IB |
| Answer» C. [C]. | |
| 24. |
The output voltage and the input voltage are ________ for the common-emitter configuration. |
| A. | in phase |
| B. | 45º out of phase |
| C. | 90º out of phase |
| D. | 180º out of phase |
| Answer» E. | |
| 25. |
The output voltage and the input voltage are ________ for the common-base configuration. |
| A. | 45º out of phase |
| B. | 90º out of phase |
| C. | 180º out of phase |
| D. | in phase |
| Answer» E. | |
| 26. |
The common-emitter configuration has a ________ level of input impedance with a ________ voltage and current gain. |
| A. | moderate, high |
| B. | low, moderate |
| C. | low, low |
| D. | high, low |
| Answer» B. low, moderate | |
| 27. |
In a common-emitter configuration ________ is the controlling current while ________ is the controlled current. |
| A. | IC, IB |
| B. | IC, IE |
| C. | IB, IC |
| D. | None of the above |
| Answer» D. None of the above | |
| 28. |
The input and output signals are ________ for the typical transistor amplifier at frequencies that permit ignoring the effects of the reactive elements. |
| A. | in phase |
| B. | 180º out of phase |
| C. | either in phase or 180º out of phase |
| D. | None of the above |
| Answer» D. None of the above | |
| 29. |
For transistor amplifiers, the no-load voltage gain is ________ the loaded voltage gain. |
| A. | smaller than |
| B. | greater than |
| C. | the same as |
| D. | None of the above |
| Answer» C. the same as | |
| 30. |
One junction of an operating transistor is ________ and the other one is ________. |
| A. | forward-biased, forward-biased |
| B. | forward-biased, reverse-biased |
| C. | reverse-biased, reverse-biased |
| D. | None of the above |
| Answer» C. reverse-biased, reverse-biased | |
| 31. |
For a common-base configuration, the input impedance is relatively ________ and the output impedance quite ________. |
| A. | high, small |
| B. | small, high |
| C. | small, small |
| D. | high, high |
| Answer» C. small, small | |
| 32. |
________ can be applied to determine the response of the ac equivalent circuit. |
| A. | Mesh analysis |
| B. | Node analysis |
| C. | Thevenin's theorem |
| D. | All of the above |
| Answer» E. | |
| 33. |
The peak value of the ac input signal is controlled by the ________ in a transistor network for the frequencies in the low to midrange. |
| A. | resistors |
| B. | applied dc voltage |
| C. | capacitors |
| D. | None of the above |
| Answer» C. capacitors | |
| 34. |
The ________ of the input signal is one of the first concerns in the sinusoidal ac analysis of transistor networks. |
| A. | period |
| B. | frequency |
| C. | magnitude |
| D. | None of the above |
| Answer» D. None of the above | |
| 35. |
The ________ model(s) is (are) commonly used in the small-signal ac analysis of transistor networks. |
| A. | re |
| B. | hybrid equivalent |
| C. | re and hybrid equivalent |
| D. | None of the above |
| Answer» D. None of the above | |
| 36. |
In an unbypassed emitter bias configuration hie replaces ________ in the re model. |
| A. | re |
| B. | [B]. |
| C. | re |
| D. | Ib |
| Answer» D. Ib | |
| 37. |
The current gain for the Darlington connection is ________. |
| A. | [A]. |
| B. | [B]. |
| C. | [C]. |
| D. | [D]. |
| Answer» C. [C]. | |
| 38. |
Which of the following configurations has an output impedance Zo equal to RC? |
| A. | Fixed-bias common-emitter |
| B. | Common-emitter voltage-divider with bypass capacitor |
| C. | Common-emitter voltage-divider without bypass capacitor |
| D. | All of the above |
| Answer» E. | |
| 39. |
Which of the following configurations has a voltage gain of –RC /re? |
| A. | Fixed-bias common-emitter |
| B. | Common-emitter voltage-divider with bypass capacitor |
| C. | Fixed-bias common-emitter and voltage-divider with bypass capacitor |
| D. | Common-emitter voltage-divider without bypass capacitor |
| Answer» D. Common-emitter voltage-divider without bypass capacitor | |
| 40. |
Under which of the following conditions is the output impedance of the network approximately equal to RC for a common-emitter fixed-bias configuration? |
| A. | ro 10RC |
| B. | ro < 10RC |
| C. | ro < ro |
| D. | ro > ro |
| Answer» B. ro < 10RC | |
| 41. |
What is the unit of the parameter ho? |
| A. | Volt |
| B. | Ohm |
| C. | Siemen |
| D. | No unit |
| Answer» D. No unit | |
| 42. |
Which of the h-parameters corresponds to re in a common-base configuration? |
| A. | hib |
| B. | hfb |
| C. | hrb |
| D. | hob |
| Answer» B. hfb | |
| 43. |
The ________ model fails to account for the output impedance level of the device and the feedback effect from output to input. |
| A. | hybrid equivalent |
| B. | re |
| C. | [C]. |
| D. | Thevenin |
| Answer» C. [C]. | |
| 44. |
The ________ model suffers from being limited to a particular set of operating conditions if it is to be considered accurate. |
| A. | hybrid equivalent |
| B. | re |
| C. | [C]. |
| D. | Thevenin |
| Answer» B. re | |
| 45. |
What is the limit of the efficiency defined by = Po / Pi? |
| A. | Greater than 1 |
| B. | Less than 1 |
| C. | Always 1 |
| D. | None of the above |
| Answer» C. Always 1 | |
| 46. |
AC current ratios ac and ac convert directly from h parameters. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 47. |
r'e is temperature dependent. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 48. |
A coupling capacitor couples dc to an amplifier. |
| A. | True |
| B. | False |
| Answer» C. | |
| 49. |
A common-collector amplifier has high input impedance, good current gain, and a voltage gain of 1. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 50. |
The common-base amplifier has a good voltage gain, low input impedance, and high current gain. |
| A. | True |
| B. | False |
| Answer» C. | |