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MCQOPTIONS
This section includes 66 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A parallel resonant band-pass filter consists of a 6.8 resistor in series with a parallel network made up of an 8 H coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 . What is the center frequency of the filter? |
| A. | 5.14 MHz |
| B. | 514 kHz |
| C. | 5.03 MHz |
| D. | 503 kHz |
| Answer» B. 514 kHz | |
| 52. |
Referring to Problem 8, assume the input voltage is 15 V ac. What is the output voltage at the critical frequency,fc? |
| A. | 0 V |
| B. | 7.07 V |
| C. | 15 V |
| D. | 10.6 V |
| Answer» E. | |
| 53. |
An RC high-pass filter consists of a 0.2 F capacitor and a 220 resistor. The output is taken across the resistor. The circuit's critical frequency is |
| A. | 723 Hz |
| B. | 7,234 Hz |
| C. | 362 Hz |
| D. | 3,617 Hz |
| Answer» E. | |
| 54. |
A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is |
| A. | 18 V peak-to-peak |
| B. | zero |
| C. | 9 V peak-to-peak |
| D. | 12.74 V peak-to-peak |
| Answer» C. 9 V peak-to-peak | |
| 55. |
Critical frequencies are also called –3 dB frequencies. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 56. |
A series resonant band-stop filter consists of a 68 resistor, a 110 mH coil, and a 0.02 F capacitor. The internal resistance, RW, of the coil is 4 . Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0? |
| A. | 1.1 mV |
| B. | 11.1 mV |
| C. | 111 mV |
| D. | 200 mV |
| Answer» C. 111 mV | |
| 57. |
An RC high-pass filter consists of an 820 resistor. What is the value of C so that Xc is ten times less than R at an input frequency of 12 kHz? |
| A. | 81 F |
| B. | 161 F |
| C. | 0.161 F |
| D. | 220 F |
| Answer» D. 220 F | |
| 58. |
An RL low-pass filter consists of a 5.6 mH coil and a 3.3 k resistor. The output voltage is taken across the resistor. The circuit's critical frequency is |
| A. | 93.8 kHz |
| B. | 93.8 Hz |
| C. | 861 Hz |
| D. | 86.12 kHz |
| Answer» B. 93.8 Hz | |
| 59. |
The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is |
| A. | 0 V |
| B. | 15 V |
| C. | 10.60 V |
| D. | 21.21 V |
| Answer» D. 21.21 V | |
| 60. |
An RC low-pass filter consists of a 120 resistor and a 0.002 F capacitor. The output is taken across the capacitor. The circuit's critical frequency is |
| A. | 333 kHz |
| B. | 633 kHz |
| C. | 331 kHz |
| D. | 60 kHz |
| Answer» C. 331 kHz | |
| 61. |
The roll-off rate of a basic RC or RL filter is 20 dB per decade. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 62. |
In a series resonant band-pass filter, a lower value of Q results in |
| A. | a higher resonant frequency |
| B. | a smaller bandwidth |
| C. | a higher impedance |
| D. | a larger bandwidth |
| Answer» E. | |
| 63. |
A parallel resonant band-pass filter consists of a 90 resistor in series with a parallel network made up of a 60 mH coil and a 0.02 F capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 . What is the center frequency of the filter? |
| A. | 459 Hz |
| B. | 4,591 Hz |
| C. | 999 Hz |
| D. | 2,176 Hz |
| Answer» C. 999 Hz | |
| 64. |
An RL high-pass filter consists of a 470 resistor and a 600 mH coil. The output is taken across the coil. The circuit's critical frequency is |
| A. | 125 Hz |
| B. | 1,250 Hz |
| C. | 564 Hz |
| D. | 5,644 Hz |
| Answer» B. 1,250 Hz | |
| 65. |
At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is |
| A. | 6.02 dB |
| B. | –6.02 dB |
| C. | 12.04 dB |
| D. | –12.04 dB |
| Answer» C. 12.04 dB | |
| 66. |
In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency |
| A. | is 7 kHz |
| B. | is 10 kHz |
| C. | is 12 kHz |
| D. | cannot be determined |
| Answer» D. cannot be determined | |