MCQOPTIONS
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MCQOPTIONS
This section includes 66 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.
| 51. |
In the input RC circuit of a single-stage BJT, by how much does the base voltage lead the input voltage at the cutoff frequency in the low-frequency region? |
| A. | About 0º |
| B. | 45º |
| C. | About 90º |
| D. | None of the above |
| Answer» C. About 90º | |
| 52. |
For the low-frequency response of a BJT amplifier, the maximum gain is where ________ . |
| A. | R B = 0 |
| B. | R C = 0 |
| C. | R E = 0 |
| D. | - |
| Answer» D. - | |
| 53. |
What is the range of the capacitors C gs and C gd ? |
| A. | 1 to 10 pF |
| B. | 1 to 10 nF |
| C. | 1 to 10 F |
| D. | 1 to 10 F |
| Answer» B. 1 to 10 nF | |
| 54. |
For audio systems, the reference level is generally accepted as ________. |
| A. | 1 mW |
| B. | 1 W |
| C. | 10 mW |
| D. | 100 mW |
| Answer» B. 1 W | |
| 55. |
By what factor does an audio level change if the power level changes from 4 W to 4096 W? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 56. |
The input power to a device is 10,000 W at 1000 V. The output power is 500 W, and the output impedance is 100 . Find the voltage gain in decibels. |
| A. | –30.01 dB |
| B. | –20.0 dB |
| C. | –13.01 dB |
| D. | –3.01 dB |
| Answer» D. –3.01 dB | |
| 57. |
Which of the following elements is (are) important in determining the gain of the system in the high-frequency region? |
| A. | Interelectrode capacitances |
| B. | Wiring capacitances |
| C. | Miller effect capacitance |
| D. | All of the above |
| Answer» E. | |
| 58. |
The larger capacitive elements of the design will determine the ________ cutoff frequency. |
| A. | low |
| B. | mid |
| C. | high |
| D. | - |
| Answer» B. mid | |
| 59. |
An amplifier rated at 30-W output is connected to a 5- speaker. Calculate the input power required for full power output if the power gain is 20 dB. |
| A. | 3 mW |
| B. | 30 mW |
| C. | 300 mW |
| D. | 3 W |
| Answer» D. 3 W | |
| 60. |
An amplifier rated at 30-W output is connected to a 5- speaker. Calculate the input voltage for the rated output if the amplifier voltage gain is 20 dB. |
| A. | 1.225 mV |
| B. | 12.25 mV |
| C. | 122.5 mV |
| D. | 1.225 V |
| Answer» E. | |
| 61. |
What is the range of the capacitor C ds ? |
| A. | 0.01 to 0.1 pF |
| B. | 0.1 to 1 pF |
| C. | 0.1 to 1 nF |
| D. | 0.1 to 1 F |
| Answer» C. 0.1 to 1 nF | |
| 62. |
The smaller capacitive elements of the design will determine the ________ cutoff frequencies. |
| A. | low |
| B. | mid |
| C. | high |
| D. | - |
| Answer» D. - | |
| 63. |
Determine the lower cutoff frequency of this network. |
| A. | 15.8 Hz |
| B. | 46.13 Hz |
| C. | 238.73 Hz |
| D. | 1575.8 Hz |
| Answer» D. 1575.8 Hz | |
| 64. |
For which of the following frequency region(s) can the coupling and bypass capacitors no longer be replaced by the short-circuit approximation? |
| A. | Low-frequency |
| B. | Mid-frequency |
| C. | High-frequency |
| D. | All of the above |
| Answer» B. Mid-frequency | |
| 65. |
What is the ratio of the capacitive reactance X CS to the input resistance R I of the input RC circuit of a single-stage BJT amplifier at the low-frequency cutoff? |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.75 |
| D. | 1.0 |
| Answer» E. | |
| 66. |
A change in frequency by a factor of ________ is equivalent to 1 octave. |
| A. | 2 |
| B. | 10 |
| C. | 5 |
| D. | 20 |
| Answer» B. 10 | |