In a phase shift oscillator, we use ___________ RC sections
Q.2.
The signal generator generally used in the laboratories is ___________ oscillator
Q.3.
An oscillator employs ___________ feedback
Q.4.
One condition for oscillation is ___________
A phase shift around the feedback loop of 180°
A gain around the feedback loop of one-third
A phase shift around the feedback loop of 0°
A gain around the feedback loop of less than 1
Q.5.
An oscillator produces___________ oscillations
Damped
Undamped
Modulated
None of the above
Q.6.
For an oscillator to properly start, the gain around the feedback loop must initially be
1
Greater than 1
Less than 1
Equal to attenuation of feedback circuit
Q.7.
A Wien bridge oscillator uses ___________ feedback
Only positive
Only negative
Both positive and negative
None of the above
Q.8.
An oscillator employs ___________ feedback
Positive
Negative
Neither positive nor negative
Data insufficient
Q.9.
In a phase shift oscillator, we use ___________ RC sections
Two
Three
Four
None of the above
Q.10.
An oscillator differs from an amplifier because it
Has more gain
Requires no input signal
Requires no d.c. supply
Always has the same input
Q.11.
A second condition for oscillations is ___________
A gain of 1 around the feedback loop
No gain around the feedback loop
The attention of the feedback circuit must be one-third
The feedback circuit must be capacitive
Q.12.
In an LC transistor oscillator, the active device is ___________
LC tank circuit
Biasing circuit
Transistor
None of the above
Q.13.
An op-amp integrator has a square-wave input. The output should be
a sine wave.
a triangle wave.
a square wave.
pure dc.
Q.14.
The frequency distortion arising because of varying amplifier gain with frequency is considerably reduced in a negative-voltage feedback amplifier circuit.
True
False
Q.15.
Which of the following is (are) feedback?
Voltage-series
Voltage-shunt
Current-series
All of the above
Q.16.
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
Q.17.
At parallel resonance, the impedance of a crystal is
minimum.
maximum.
equal.
zero.
Q.18.
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.
Q.19.
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
Q.20.
What is the typical value of quality factor for crystal oscillators?
20,000
1000
100
10
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