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Electrical Engineering
Oscillators
Quiz 3
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Q.1
The twin-T oscillator produces a ________ response.
low-pass
high-pass
band-pass
band-stop
Q.2
For frequencies up to 1 MHz, the ________ is the most widely used type of sinusoidal RC oscillator.
Wien-bridge
phase-shift
twin-T
None of these
Q.3
The start-up gain of an oscillator must be ________ one.
equal to
less than
greater than
All of above
Q.4
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
Q.5
At series resonance, the impedance of a crystal is
minimum.
maximum.
equal.
zero.
Q.6
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.
Q.7
An input signal is needed for an oscillator to start.
True
False
Q.8
What is the total phase shift requirement, around the feedback loop, for a phase-shift oscillator?
90°
180°
270°
360°
Q.9
The Nyquist plot combines the two Bode plots of gain versus frequency and phase shift versus frequency on a single plot.
True
False
Q.10
One condition for positive feedback is that the phase shift around the feedback loop must be ________°.
0
90
180
45
Q.11
The amplifier is unstable if the Nyquist curve plotted encloses (encircles) the –1 point, and it is stable otherwise.
True
False
Q.12
Which of the following oscillators is (are) tuned oscillators?
Colpitts
Hartley
Crystal
All of the above
Q.13
What is the ratio of the output impedance with series feedback to that without feedback?
1
1 + A
A
A
Q.14
What is the ratio of the input impedance with series feedback to that without feedback?
1 + A
A
1
All of above
Q.15
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.
Q.16
Which of the following is required for oscillation?
A > 1
The phase shift around the feedback network must be 180º.
Both A > 1 and the phase shift around the feedback network must be 180º.
None of the above
Q.17
A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called
a voltage-controlled oscillator.
a crystal oscillator.
a Hartley oscillator.
an astable multivibrator.
Q.18
The feedback signal in a(n) ________ oscillator is derived from a capacitive voltage divider in the LC circuit.
Hartley
Armstrong
Colpitts
None of these
Q.19
Sinusoidal oscillators operate with ________ feedback.
positive
negative
Q.20
For a phase-shift oscillator, the gain of the amplifier stage must be greater than ________.
19
29
30
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