[Top 100] Simple Oscillator Circuit MCQs with Answers: Following are the questions quiz from Chapter 1 Oscillator (Oscillator MCQs)
Oscillator MCQs
1. Which of the following is an essential component of an oscillator circuit?
a. Diode
b. Transistor
c. Capacitor
d. Resistor
Answer: c. Capacitor
2. The frequency of an LC oscillator can be changed by adjusting:
a. The inductance of the coil
b. The capacitance of the capacitor
c. The resistance of the resistor
d. Both a and b
Answer: d. Both a and b
3. Which type of oscillator uses a quartz crystal to maintain its frequency?
a. RC oscillator
b. LC oscillator
c. Crystal oscillator
d. Colpitts oscillator
Answer: c. Crystal oscillator
4. In an LC oscillator circuit, what component provides the feedback needed for oscillation?
a. Inductor
b. Capacitor
c. Resistor
d. Transistor
Answer: a. Inductor
5. Which oscillator circuit is commonly used in radio transmitters and receivers?
a. Hartley oscillator
b. Colpitts oscillator
c. Wien bridge oscillator
d. Astable multivibrator
Answer: a. Hartley oscillator
6. The output waveform of a square wave oscillator is:
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: c. Square wave
7. The phase shift oscillator circuit consists of:
a. Only resistors
b. Only capacitors
c. Only inductors
d. Both resistors and capacitors
Answer: d. Both resistors and capacitors
8. The frequency stability of a crystal oscillator is:
a. Low
b. Medium
c. High
d. Very high
Answer: d. Very high
9. Which oscillator circuit is commonly used in audio oscillators and tone generators?
a. Hartley oscillator
b. Colpitts oscillator
c. Wien bridge oscillator
d. Phase shift oscillator
Answer: c. Wien bridge oscillator
10. Which oscillator circuit is commonly used in frequency synthesizers and frequency modulators?
a. Hartley oscillator
b. Colpitts oscillator
c. Pierce oscillator
d. Crystal oscillator
Answer: c. Pierce oscillator
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11. What is the condition for oscillation in a negative feedback oscillator?
a. Phase shift is 0 degrees
b. Phase shift is 180 degrees
c. Phase shift is between 0 and 180 degrees
d. Phase shift is greater than 180 degrees
Answer: c. Phase shift is between 0 and 180 degrees
12. Which of the following is an example of a relaxation oscillator?
a. Astable multivibrator
b. Colpitts oscillator
c. Hartley oscillator
d. Crystal oscillator
Answer: a. Astable multivibrator
13. The frequency of a crystal oscillator is determined by:
a. The value of the inductor
b. The value of the capacitor
c. The physical dimensions of the crystal
d. The value of the resistor
Answer: c. The physical dimensions of the crystal
14. Which of the following is a disadvantage of the Wien bridge oscillator?
a. It is difficult to design and construct
b. It has poor frequency stability
c. It has low output amplitude
d. It requires a large number of components
Answer: b. It has poor frequency stability
15. In a Colpitts oscillator, the feedback is provided by:
a. An inductor and two capacitors
b. A resistor and a capacitor
c. Two resistors and a capacitor
d. A transformer and a capacitor
Answer: a. An inductor and two capacitors
16. The output waveform of a sine wave oscillator is:
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: a. Sine wave
17. Which oscillator circuit is commonly used in audio power amplifiers?
a. Hartley oscillator
b. Colpitts oscillator
c. Phase shift oscillator
d. Wien bridge oscillator
Answer: c. Phase shift oscillator
18. What is the frequency range of an LC oscillator?
a. Low frequency
b. Medium frequency
c. High frequency
d. Very high frequency
Answer: d. Very high frequency
19. The frequency stability of an RC oscillator is:
a. Low
b. Medium
c. High
d. Very high
Answer: a. Low
20. The output waveform of a triangle wave oscillator is:
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: b. Triangle wave
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21. What is the main advantage of a crystal oscillator over other types of oscillators?
a. High frequency stability
b. Low power consumption
c. Low cost
d. High output power
Answer: a. High frequency stability
22. The frequency of an RC oscillator is determined by:
a. The value of the resistor
b. The value of the capacitor
c. Both a and b
d. The type of transistor used
Answer: c. Both a and b
23. In a Wien bridge oscillator, the feedback network consists of:
a. Two resistors and a capacitor
b. Two capacitors and a resistor
c. A transformer and a capacitor
d. An inductor and a capacitor
Answer: b. Two capacitors and a resistor
24. Which oscillator circuit is commonly used in voltage-controlled oscillators (VCOs)?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Phase locked loop (PLL)
Answer: a. Colpitts oscillator
25. The frequency stability of a LC oscillator is:
a. Low
b. Medium
c. High
d. Very high
Answer: c. High
26. What is the main advantage of a voltage-controlled oscillator (VCO)?
a. High frequency stability
b. Low power consumption
c. Frequency can be varied over a wide range
d. Low cost
Answer: c. Frequency can be varied over a wide range
27. In an LC oscillator, what component provides the energy for oscillation?
a. Capacitor
b. Resistor
c. Inductor
d. Transistor
Answer: c. Inductor
28. What is the condition for oscillation in a positive feedback oscillator?
a. Phase shift is 0 degrees
b. Phase shift is 180 degrees
c. Phase shift is between 0 and 180 degrees
d. Phase shift is greater than 180 degrees
Answer: d. Phase shift is greater than 180 degrees
29. Which oscillator circuit is commonly used in digital clocks and watches?
a. Colpitts oscillator
b. Pierce oscillator
c. Wien bridge oscillator
d. Astable multivibrator
Answer: b. Pierce oscillator
30. The frequency stability of a phase-locked loop (PLL) oscillator is:
a. Low
b. Medium
c. High
d. Very high
Answer: d. Very high
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31. Which of the following oscillator circuits is commonly used in radio transmitters and receivers?
a. Pierce oscillator
b. Hartley oscillator
c. Phase-locked loop (PLL) oscillator
d. Wien bridge oscillator
Answer: b. Hartley oscillator
32. The frequency stability of a crystal oscillator is affected by:
a. Temperature changes
b. Voltage fluctuations
c. Component tolerances
d. All of the above
Answer: d. All of the above
33. What is the output waveform of a square wave oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: c. Square wave
34. What is the condition for sustained oscillations in an LC oscillator?
a. The loop gain is greater than 1
b. The loop gain is less than 1
c. The loop gain is equal to 1
d. The phase shift is 180 degrees
Answer: a. The loop gain is greater than 1
35. Which of the following oscillator circuits is commonly used in frequency synthesizers?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Phase-locked loop (PLL) oscillator
Answer: d. Phase-locked loop (PLL) oscillator
36. What is the output waveform of a sawtooth wave oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: d. Sawtooth wave
37. Which of the following oscillator circuits is commonly used in audio oscillators?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase shift oscillator
d. Wien bridge oscillator
Answer: a. Colpitts oscillator
38. The frequency of a Wien bridge oscillator can be varied by changing the value of:
a. The resistor
b. The capacitor
c. Both a and b
d. None of the above
Answer: c. Both a and b
39. What is the output waveform of a pulse wave oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: c. Square wave
40. Which of the following oscillator circuits is commonly used in crystal oscillators?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Phase shift oscillator
Answer: c. Pierce oscillator
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41. The frequency stability of an RC oscillator is affected by:
a. Temperature changes
b. Voltage fluctuations
c. Component tolerances
d. All of the above
Answer: d. All of the above
42. What is the main disadvantage of a Wien bridge oscillator?
a. High frequency stability
b. Low distortion
c. Low output power
d. Difficult to design
Answer: c. Low output power
43. Which of the following oscillator circuits is commonly used in audio amplifiers?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase shift oscillator
d. Wien bridge oscillator
Answer: c. Phase shift oscillator
44. The frequency stability of an RC phase shift oscillator is affected by:
a. Temperature changes
b. Voltage fluctuations
c. Component tolerances
d. All of the above
Answer: c. Component tolerances
45. What is the output waveform of a sine wave oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: a. Sine wave
46. What is the condition for oscillation in a negative feedback oscillator?
a. Phase shift is 0 degrees
b. Phase shift is 180 degrees
c. Phase shift is between 0 and 180 degrees
d. Phase shift is greater than 180 degrees
Answer: b. Phase shift is 180 degrees
47. Which oscillator circuit is commonly used in microcontrollers and digital signal processors (DSPs)?
a. Colpitts oscillator
b. Pierce oscillator
c. Wien bridge oscillator
d. Relaxation oscillator
Answer: d. Relaxation oscillator
48. What is the main disadvantage of a LC oscillator?
a. Low frequency stability
b. High distortion
c. High output power
d. Difficult to design
Answer: a. Low frequency stability
49. Which of the following oscillator circuits is commonly used in frequency counters and sweep generators?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Voltage-controlled oscillator (VCO)
Answer: d. Voltage-controlled oscillator (VCO)
50. What is the output waveform of a triangle wave oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: b. Triangle wave
Simple Oscillator Circuit MCQs
51. Which of the following oscillator circuits is commonly used in analog-to-digital converters (ADCs)?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Ramp generator oscillator
Answer: d. Ramp generator oscillator
52. What is the main advantage of a crystal oscillator over other types of oscillators?
a. High output power
b. Low distortion
c. High frequency stability
d. Low cost
Answer: c. High frequency stability
53. What is the output waveform of a phase shift oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: a. Sine wave
54. Which of the following oscillator circuits is commonly used in synthesizers and signal generators?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase locked loop (PLL) oscillator
d. Wien bridge oscillator
Answer: c. Phase locked loop (PLL) oscillator
55. What is the main disadvantage of a relaxation oscillator?
a. Low frequency stability
b. High distortion
c. High output power
d. Difficult to design
Answer: a. Low frequency stability
56. Which of the following oscillator circuits is commonly used in voltage-controlled oscillators (VCOs)?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Phase shift oscillator
Answer: a. Colpitts oscillator
57. What is the output waveform of a sine wave oscillator based on an op-amp?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: a. Sine wave
58. Which of the following oscillator circuits is commonly used in phase-locked loop (PLL) oscillators?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Voltage-controlled oscillator (VCO)
Answer: d. Voltage-controlled oscillator (VCO)
59. The frequency stability of a voltage-controlled oscillator (VCO) is affected by:
a. Temperature changes
b. Voltage fluctuations
c. Component tolerances
d. Control voltage variations
Answer: d. Control voltage variations
60. Which of the following oscillator circuits is commonly used in LC tank circuits?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Phase shift oscillator
Answer: b. Hartley oscillator
61. Which of the following oscillator circuits is commonly used in radio frequency (RF) oscillators?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Phase shift oscillator
Answer: a. Colpitts oscillator
62. What is the output waveform of a square wave oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: c. Square wave
63. Which of the following oscillator circuits is commonly used in clocks and timers?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Relaxation oscillator
Answer: d. Relaxation oscillator
64. What is the main disadvantage of a Pierce oscillator?
a. Low frequency stability
b. High distortion
c. Low output power
d. Difficult to design
Answer: d. Difficult to design
65. Which of the following oscillator circuits is commonly used in crystal oscillators?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Phase shift oscillator
Answer: c. Pierce oscillator
66. What is the output waveform of a sawtooth wave oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: d. Sawtooth wave
67. What is the main advantage of a LC oscillator over other types of oscillators?
a. High output power
b. Low distortion
c. High frequency stability
d. Low cost
Answer: b. Low distortion
68. Which of the following oscillator circuits is commonly used in crystal oscillators for microcontrollers and microprocessors?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Relaxation oscillator
Answer: c. Pierce oscillator
69. What is the main disadvantage of a phase shift oscillator?
a. Low frequency stability
b. High distortion
c. Low output power
d. Difficult to design
Answer: a. Low frequency stability
70. Which of the following oscillator circuits is commonly used in frequency synthesizers?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase locked loop (PLL) oscillator
d. Wien bridge oscillator
Answer: c. Phase locked loop (PLL) oscillator
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71. The frequency stability of a crystal oscillator is affected by:
a. Temperature changes
b. Voltage fluctuations
c. Component tolerances
d. All of the above
Answer: a. Temperature changes
72. What is the output waveform of a relaxation oscillator based on a transistor?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: c. Square wave
73. Which of the following oscillator circuits is commonly used in sweep generators?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase shift oscillator
d. Wien bridge oscillator
Answer: c. Phase shift oscillator
74. What is the main disadvantage of a voltage-controlled oscillator (VCO)?
a. Low frequency stability
b. High distortion
c. Low output power
d. Difficult to design
Answer: a. Low frequency stability
75. Which of the following oscillator circuits is commonly used in audio oscillators?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase shift oscillator
d. Wien bridge oscillator
Answer: a. Colpitts oscillator
76. What is the output waveform of a ramp generator oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: b. Triangle wave
77. Which of the following oscillator circuits is commonly used in radio transmitters?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase shift oscillator
d. Wien bridge oscillator
Answer: b. Hartley oscillator
78. What is the main disadvantage of a Wien bridge oscillator?
a. Low frequency stability
b. High distortion
c. Low output power
d. Difficult to design
Answer: b. High distortion
79. Which of the following oscillator circuits is commonly used in function generators?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase shift oscillator
d. Wien bridge oscillator
Answer: d. Wien bridge oscillator
80. What is the output waveform of a sine wave oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: a. Sine wave
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81. Which of the following oscillator circuits is commonly used in audio frequency (AF) oscillators?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase shift oscillator
d. Wien bridge oscillator
Answer: a. Colpitts oscillator
82. What is the main advantage of a relaxation oscillator?
a. High frequency stability
b. Low distortion
c. High output power
d. Easy to design
Answer: d. Easy to design
83. Which of the following oscillator circuits is commonly used in signal generators?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase shift oscillator
d. Wien bridge oscillator
Answer: a. Colpitts oscillator
84. What is the main disadvantage of a LC tank oscillator?
a. Low output power
b. High distortion
c. Low frequency stability
d. Difficult to design
Answer: c. Low frequency stability
85. Which of the following oscillator circuits is commonly used in voltage-controlled oscillators (VCOs)?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase locked loop (PLL) oscillator
d. Wien bridge oscillator
Answer: a. Colpitts oscillator
86. What is the output waveform of a function generator oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: a. Sine wave
87. Which of the following oscillator circuits is commonly used in frequency counters?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase locked loop (PLL) oscillator
d. Wien bridge oscillator
Answer: c. Phase locked loop (PLL) oscillator
88. What is the main advantage of a Wien bridge oscillator?
a. High frequency stability
b. Low distortion
c. High output power
d. Easy to design
Answer: d. Easy to design
89. Which of the following oscillator circuits is commonly used in crystal oscillators for frequency synthesis?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Relaxation oscillator
Answer: c. Pierce oscillator
90. What is the output waveform of a phase shift oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: a. Sine wave
91. Which of the following oscillator circuits is commonly used in microcontrollers?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Relaxation oscillator
Answer: c. Pierce oscillator
92. What is the main disadvantage of a crystal oscillator?
a. Low frequency stability
b. High distortion
c. Low output power
d. Limited frequency range
Answer: d. Limited frequency range
93. Which of the following oscillator circuits is commonly used in frequency modulation (FM) transmitters?
a. Colpitts oscillator
b. Hartley oscillator
c. Phase locked loop (PLL) oscillator
d. Varactor-tuned LC oscillator
Answer: d. Varactor-tuned LC oscillator
94. What is the main advantage of a voltage-controlled oscillator (VCO)?
a. High frequency stability
b. Low distortion
c. High output power
d. Frequency tunability
Answer: d. Frequency tunability
95. Which of the following oscillator circuits is commonly used in temperature-compensated crystal oscillators (TCXOs)?
a. Colpitts oscillator
b. Pierce oscillator
c. Wien bridge oscillator
d. Relaxation oscillator
Answer: b. Pierce oscillator
96. What is the output waveform of a ring oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: c. Square wave
97. Which of the following oscillator circuits is commonly used in voltage-controlled crystal oscillators (VCXOs)?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Wien bridge oscillator
Answer: c. Pierce oscillator
98. What is the main disadvantage of a relaxation oscillator?
a. Low frequency stability
b. High distortion
c. Low output power
d. Limited frequency range
Answer: a. Low frequency stability
99. Which of the following oscillator circuits is commonly used in phase-locked loops (PLLs)?
a. Colpitts oscillator
b. Hartley oscillator
c. Pierce oscillator
d. Wien bridge oscillator
Answer: c. Pierce oscillator
100. What is the output waveform of a crystal oscillator?
a. Sine wave
b. Triangle wave
c. Square wave
d. Sawtooth wave
Answer: a. Sine wave
