Oscillator MCQs | Oscillator Multiple Choice Questions and Answers

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Questions
1 An oscillator converts ……………..
A c. power into d.c. power
B c. power into a.c. power
C mechanical power into a.c. power
D none of the above

Answer: c. power into a.c. power
2 In an LC oscillator, the frequency of oscillator is ……………. L or C.
A Proportional to square of
B Directly proportional to
C Independent of the values of
D Inversely proportional to square root of

Answer: Inversely proportional to square root of
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3 An LC oscillator cannot be used to produce ……………….. frequencies
A High
B Audio
C Very low
D Very high

Answer: Very low
4 In a phase shift oscillator, the frequency determining elements are …………
A L and C
B R, L and C
C R and C
D None of the above

Answer: R and C
5 The piezoelectric effect in a crystal is ……………
A A voltage developed because of mechanical stress
B A change in resistance because of temperature
C A change in frequency because of temperature
D None of the above

Answer: A voltage developed because of mechanical stress
6 The application where one would most likely find a crystal oscillator is ……………..
A Radio receiver
B Radio transmitter
C AF sweep generator
D None of the above

Answer: Radio transmitter
7 For an oscillator to properly start, the gain around the feedback loop must initially be
A 1
B Greater than 1
C Less than 1
D Equal to attenuation of feedback circuit

Answer: Greater than 1
8 The Q of the crystal is of the order of …………
A 100
B 1000
C 50
D More than 10,000

Answer: More than 10,000
9 In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is …………
A Increased 2 times
B Decreased 4 times
C Increased 4 times
D Decreased 2 times

Answer: Decreased 2 times
10 Which of the following is not an example for non-sinusoidal oscillator?
A Sawtooth Generators
B Blocking oscillators
C Multivibrator
D Crystal oscillators

Answer: Crystal oscillators
11 The sinusoidal oscillator is also called ___________
A LC oscillator
B Harmonic oscillator
C RC oscillator
D Crystal oscillators

Answer: Harmonic oscillator
12 Low frequency oscillators have a frequency range of ___________
A 20 Hz-20K Hz
B 20 Hz -100k Hz
C 1 Hz -20k Hz
D 50 Hz -100k Hz

Answer: 20 Hz -100k Hz
13 High frequency oscillators have a frequency range of ___________
A 300K Hz-2G Hz
B 100k Hz-500k Hz
C 8k Hz-800K Hz
D 4K Hz-1G Hz

Answer: 300K Hz-2G Hz
14 Relaxation oscillators are also known as ___________
A Multivibrator
B Phase shift oscillators
C Blocking oscillators
D Saw tooth generator

Answer: Multivibrator
15 Which of the following oscillator cannot be used in low frequency oscillations?
A Wein bridge oscillators
B RC phase shift oscillators
C Colpitts oscillators
D RC oscillators

Answer: Colpitts oscillators
16 Which of the following oscillator is not using a feedback network for its oscillation?
A LC oscillator
B RC oscillator
C Crystal oscillator
D Relaxation oscillators

Answer: Relaxation oscillators
17 The signal generator generally used in the laboratories is ………….. oscillator
A Wien-bridge
B Hartely
C Crystal
D Phase shift

Answer: Wien-bridge
18 Quartz crystal is most commonly used in crystal oscillators because ………….
A It has superior electrical properties
B It is easily available
C It is quite inexpensive
D None of the above

Answer: It has superior electrical properties
19 In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency……….
A Remains the same
B Decreases
C Increases
D Insufficient data

Answer: Increases
20 One condition for oscillation is ………….
A A phase shift around the feedback loop of 180o
B A gain around the feedback loop of one-third
C A phase shift around the feedback loop of 0o
D A gain around the feedback loop of less than 1

Answer: A phase shift around the feedback loop of 0o
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