Electronic Devices and Circuit Theory Oscillator Circuits Questions with Answers

Electronic Devices and Circuit Theory – Oscillator Circuits Questions with Answers cover one of the most fundamental areas in electronics. Oscillator circuits are used to generate periodic waveforms without any input signal. Understanding how these circuits work is essential for exams like GATE, ISRO, DRDO, and ECIL. This topic focuses on the design, analysis, and operation of oscillators including RC, LC, and crystal oscillators. Practicing these electronics MCQs and programming questions with answers helps learners strengthen their conceptual knowledge and prepare effectively for technical interviews and competitive exams.

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Which of the following improvements is (are) a result of the negative feedback in a circuit?

A Lower output impedance
B Reduced noise
C More linear operation
D All of the above

Answer: Option D

The feedback signal in a(n) ________ oscillator is derived from an inductive voltage divider in the LC circuit.

A Hartley
B Armstrong
C Colpitts
D [NIL]

Answer: Option A

The attenuation of the three-section RC feedback phase-shift oscillator is

A 1/9.
B 1/30.
C 1/3.
D 1/29.

Answer: Option D

For a phase-shift oscillator, the gain of the amplifier stage must be greater than ________.

A 19
B 29
C 30
D 1

Answer: Option B

Which of the following is (are) the determining factor(s) of the stability of a feedback amplifier?

A A
B Phase shift between input and output signals
C Both A and the phase shift between input and output signals
D None of the above

Answer: Option C

What is the minimum frequency at which a crystal will oscillate?

A seventh harmonic
B third harmonic
C fundamental
D second harmonic

Answer: Option C

An amplifier with a gain of –500 and a feedback of = –0.1 has a gain change of 15% due to temperature. Calculate the change in gain of the feedback amplifier.

A 0.2%
B 0.3%
C 0.4%
D 0.5%

Answer: Option B

The feedback signal in a(n) ________ oscillator is derived from a capacitive voltage divider in the LC circuit.

A Hartley
B Armstrong
C Colpitts

Answer: Option C

Sinusoidal oscillators operate with ________ feedback.

A positive
B negative

Answer: Option A

Q10

A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called

A a voltage-controlled oscillator.
B a crystal oscillator.
C a Hartley oscillator.
D an astable multivibrator.

Answer: Option A

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Electronic Devices and Circuit Theory-Oscillator Circuits Questions and Answers

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Electronic Devices and Circuit Theory-Oscillator Circuits Questions and Answers

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