Basic principles of Sine Wave Oscillator – 2 MCQ’s

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This set of Linear Integrated Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Basic principles of Sine Wave Oscillator – 2″.

1. How many RC stages are used in the RC phase shift oscillator?
a) Six
b) Two
c) Four
d) Three

2. Calculate the frequency of oscillation for RC phase shift oscillator having the value of R and C as 35Ω and 3.7µF respectively.
a) 1230 Hz
b) 204 Hz
c) 502Hz
d) 673 Hz

3. What will be the phase shift of feedback circuit in RC phase shift oscillator?
a) 360o phase shift
b) 180o phase shift
c) 90o phase shift
d) 60o phase shift

4. What must be done to ensure that oscillation will not die out in RC phase shift oscillator?
a) Gain of amplifier is kept greater than 29
b) Gain of amplifier is kept greater than 1
c) Gain of amplifier is kept less than 29
d) Gain of amplifier is kept less than 1

5. Which type of op-amp is avoided for high frequencies?
a) LM318
b) Op-amp 741
c) LF 351
d) None of the mentioned

6. A phase shift oscillator is designed to oscillate at 155Hz. Determine the value of Rf. (Take C=0.30µF)
a) 399Ω
b) 3.98MΩ
c) 13.9kΩ
d) 403kΩ

7. Calculate the feedback voltage from phase shit network.

Calculate the feedback voltage from phase shit network

a) Vf = ( VoR3S3C3) / (1+ 6SRC+5S2C2R2+S3R3C3)
b) Vf = ( VoR3S3C3) / (1+ 5SRC+6S2C2R2+S3R3C3)
c) Vf = ( VoR3S3C3) / (1+ 5SRC+5S2C2R2+S3R3C3)
d) Vf = ( VoR2S3C3) / (1+ 6SRC+5S2C2R2+S3R3C3)

8. Find out the constant values of α and ß in phase shift oscillator.
a) α = √6, ß = -1/29
b) α = 6, ß = -1/29
c) α = √6, ß = 1/29
d) α = 6, ß = -1/29

9. The value of feedback resistor in phase shift oscillator is 180kΩ. Find its input resistance?
a) 52kΩ
b) 151kΩ
c) 209kΩ
d) 6.2kΩ

10. The condition for zero phase shift in wein bridge oscillator is achieved by
a) Connecting feedback to non-inverting input terminal of op-amp
b) Balancing the bridge
c) Applying parallel combination of RC to the feedback network
d) All of the mentioned

11. Determine the frequency of oscillation (fo) in phase shift oscillator?
a) fo = √6/ωRC
b) fo = 0.56/ωRC
c) fo = 0.065/ωRC
d) fo = 6/ωRC

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