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Free download in PDF Oscillator Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, NEET, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
(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
(3)
An LC oscillator cannot be used to produce ……………….. frequencies
[A]
High
[B]
Audio
[C]
Very low
[D]
Very high
(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
(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
(8)
The Q of the crystal is of the order of …………
[A]
100
[B]
1000
[C]
50
[D]
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
(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
(14)
Relaxation oscillators are also known as ___________
[A]
Multivibrator
[B]
Phase shift oscillators
[C]
Blocking oscillators
[D]
Saw tooth generator
(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
(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
(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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