Q.1.
The twin-T oscillator produces a ________ response.
Q.2.
For frequencies up to 1 MHz, the ________ is the most widely used type of sinusoidal RC oscillator.
Q.3.
The start-up gain of an oscillator must be ________ one.
Q.4.
In the IC phase-shift oscillator, what should the ratio of feedback resistor Rf to R1 be?
Q.5.
At series resonance, the impedance of a crystal is
Q.6.
The lead-lag circuit in the Wien-bridge oscillator has a resonant frequency at which the attenuation is
Q.7.
An input signal is needed for an oscillator to start.
Q.8.
What is the total phase shift requirement, around the feedback loop, for a phase-shift oscillator?
Q.9.
The Nyquist plot combines the two Bode plots of gain versus frequency and phase shift versus frequency on a single plot.
Q.10.
One condition for positive feedback is that the phase shift around the feedback loop must be ________°.
Q.11.
The amplifier is unstable if the Nyquist curve plotted encloses (encircles) the –1 point, and it is stable otherwise.
Q.12.
Which of the following oscillators is (are) tuned oscillators?
Q.13.
What is the ratio of the output impedance with series feedback to that without feedback?
Q.14.
What is the ratio of the input impedance with series feedback to that without feedback?
Q.15.
In order to start up, a feedback oscillator requires
Q.16.
Which of the following is required for oscillation?
Q.17.
A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called
Q.18.
The feedback signal in a(n) ________ oscillator is derived from a capacitive voltage divider in the LC circuit.
Q.19.
Sinusoidal oscillators operate with ________ feedback.
Q.20.
For a phase-shift oscillator, the gain of the amplifier stage must be greater than ________.