Electronic Devices and Circuit Theory-Oscillator Circuits
Electronic Devices and Circuit Theory-Oscillator Circuits
21. The twin-T oscillator produces a ________ response.
- low-pass
- high-pass
- band-pass
- band-stop
22. What is the typical value of quality factor for crystal oscillators?
- 20,000
- 1000
- 100
- 10
23. Which of the following improvements is (are) a result of the negative feedback in a circuit?
- Higher input impedance
- Better stabilized voltage gain
- Improved frequency response
- All of the above
24. In the Wien bridge oscillator, which of the following is (are) frequency-determining components?
- R1 and R2
- C1 and C2
- R1, R2, C1, and C2
- None of the above
25. A certain oscillator has a tap on the inductor in the tank circuit. This oscillator is probably
- a Colpitts oscillator.
- a Clapp oscillator
- a crystal oscillator.
- a Hartley oscillator.
27. Calculate the fr of a lead-lag network if R1 = R2 = 6.8 k, and C1 = C2 = 0.05 F.
- 468 Hz
- 4.68 kHz
- 46.8 kHz
- 468 kHz
28. Which of the following is (are) feedback?
- Voltage-series
- Voltage-shunt
- Current-series
- All of the above
29. What is the relationship between the series and parallel resonant frequencies of a quartz crystal?
- They are equal.
- Parallel resonant frequency is approximately 1 kHz higher than series resonant frequency.
- Series resonant frequency is approximately 1 kHz higher than parallel resonant frequency.
- none of the above
30. An op-amp integrator has a square-wave input. The output should be
- a sine wave.
- a triangle wave.
- a square wave
- pure dc.