MCQOPTIONS
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MCQOPTIONS
This section includes 111 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.
| 101. |
Which of the following is (are) the determining factor(s) of the stability of a feedback amplifier? |
| A. | A |
| B. | Phase shift between input and output signals |
| C. | Both A and the phase shift between input and output signals |
| D. | None of the above |
| Answer» D. None of the above | |
| 102. |
For a phase-shift oscillator, the gain of the amplifier stage must be greater than ________. |
| A. | 19 |
| B. | 29 |
| C. | 30 |
| D. | 1 |
| Answer» C. 30 | |
| 103. |
Referring to this figure, calculate the voltage gain without feedback for the following circuit values: R D = 4 k , R S = 1 k , R F = 15 k , and g m = 5000 ?S. |
| A. | –20.0 |
| B. | –21.5 |
| C. | –23.5 |
| D. | –25.5 |
| Answer» B. –21.5 | |
| 104. |
The attenuation of the three-section RC feedback phase-shift oscillator is |
| A. | 1/9. |
| B. | 1/30. |
| C. | 1/3. |
| D. | 1/29. |
| Answer» E. | |
| 105. |
Given g m = 5000 S, r d = 40 k , R = 10 k , and A = 35. Determine the value of R D for oscillator operation at 1 kHz. |
| A. | 8.05 k |
| B. | 8.48 k |
| C. | 10.8 k |
| D. | 12.3 k |
| Answer» C. 10.8 k | |
| 106. |
The feedback signal in a(n) ________ oscillator is derived from an inductive voltage divider in the LC circuit. |
| A. | Hartley |
| B. | Armstrong |
| C. | Colpitts |
| D. | - |
| Answer» B. Armstrong | |
| 107. |
This circuit is a ________ oscillator. |
| A. | phase-shift |
| B. | Wien bridge |
| C. | Colpitts |
| D. | Hartley |
| Answer» B. Wien bridge | |
| 108. |
Which of the following improvements is (are) a result of the negative feedback in a circuit? |
| A. | Lower output impedance |
| B. | Reduced noise |
| C. | More linear operation |
| D. | All of the above |
| Answer» E. | |
| 109. |
At what phase shift is the magnitude of A at its maximum in the Nyquist plot? |
| A. | 90º |
| B. | 180º |
| C. | 270º |
| D. | 0º |
| Answer» C. 270º | |
| 110. |
Only the condition A = ________ must be satisfied for self-sustained oscillations to result. |
| A. | 0 |
| B. | –1 |
| C. | 1 |
| D. | None of the above |
| Answer» D. None of the above | |
| 111. |
Calculate the value of C 1 = C 2 for the Wien bridge oscillator to operate at a frequency of 20 kHz. Assume R 1 = R 2 = 50 k and R 3 = 3R 4 = 600 ? |
| A. | 1.59 pF |
| B. | 15.9 pF |
| C. | 159 pF |
| D. | 1.59 nF |
| Answer» D. 1.59 nF | |