Q.1
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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