Electronic Devices and Circuit Theory-Oscillator Circuits Questions and Answers
Electronic Devices and Circuit Theory – Oscillator Circuits Questions with Answers cover one of the most fundamental areas in electronics. Oscillator circuits are used to generate periodic waveforms without any input signal. Understanding how these circuits work is essential for exams like GATE, ISRO, DRDO, and ECIL. This topic focuses on the design, analysis, and operation of oscillators including RC, LC, and crystal oscillators. Practicing these electronics MCQs and programming questions with answers helps learners strengthen their conceptual knowledge and prepare effectively for technical interviews and competitive exams.
Electronic Devices and Circuit Theory-Oscillator Circuits
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40 questions
11. In order to start up, a feedback oscillator requires
- negative feedback less than 1.
- positive feedback greater than 1.
- unity feedback equal to 1.
- no feedback.
12. The amplifier is unstable if the Nyquist curve plotted encloses (encircles) the –1 point, and it is stable otherwise.
- TRUE
- FALSE
13. Which of the following oscillators is (are) tuned oscillators?
- Colpitts
- Hartley
- Crystal
- All of the above
14. The Nyquist plot combines the two Bode plots of gain versus frequency and phase shift versus frequency on a single plot.
- TRUE
- FALSE
16. The lead-lag circuit in the Wien-bridge oscillator has a resonant frequency at which the attenuation is
- 1/2
- 1/4.
- 1/3.
- 1/5.
17. The start-up gain of an oscillator must be ________ one.
- equal to
- less than
- greater than
18. In the IC phase-shift oscillator, what should the ratio of feedback resistor Rf to R1 be?
- Zero
- Greater than –29
- Less than 29
- Any value
19. At series resonance, the impedance of a crystal is
- minimum.
- maximum.
- equal.
- zero.
20. For frequencies up to 1 MHz, the ________ is the most widely used type of sinusoidal RC oscillator.
- Wien-bridge
- phase-shift
- twin-T
- [NIL]