# Analog Circuits Questions and Answers – Classification of Oscillator-2

This set of Analog Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Oscillator-2”.

1. Which of the following is not an example of non-sinusoidal oscillator?
a) Sawtooth Generators
b) Blocking oscillators
c) Multivibrator
d) Crystal oscillators

Explanation: The sawtooth generator generates an output resembling the teeth of a plain toothed saw. A blocking oscillator is a free running generator, used to produce narrow trigger pulses. A multivibrator is used to produce an output varying between 2 states- a high and low, producing square waves of a different duty cycle. A crystal oscillator is the only one of all used to produce sinusoidal signals.

2. Which of the following is not an LC oscillator?
a) Hartley Oscillator
b) Colpitts oscillator
c) Crystal oscillator
d) Clapp oscillator

Explanation: Crystal oscillator is not an LC oscillator because it does not contain any L or C.

3. The sinusoidal oscillator is also called ___________
a) LC oscillator
b) Harmonic oscillator
c) RC oscillator
d) Crystal oscillators

Explanation: Sinusoidal oscillators are called harmonic oscillators.

4. Which type of oscillators is used in timing elements?
a) RC oscillator
b) LC oscillator
c) Crystal oscillator
d) Weinbridge oscillators

Explanation: Crystal oscillators are best suitable for the use in timing elements because of its high frequency stability. We can obtain precise, high and stable frequency of operation. There is very low frequency drift over time.

5. 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

Explanation: UJT relaxation oscillator doesn’t have a feedback system for oscillation.

6. 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

Explanation: Low frequency oscillators are also called Audio frequency oscillators. It operates in low frequencies, that is from 20Hz to 100-200KHz.

7. 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

Explanation: High frequency oscillators are also called Radio frequency oscillators. It has a range of 300KHz to several megahertz.

8. 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

Explanation: Since Colpitts oscillator is an LC oscillator it cannot be used as a low frequency oscillator. Capacitor present provides a low reactance path to HF signals and thus provides excellent performance in the high frequency region, even in microwave.

9. Which of the following oscillator is will give the most stable output oscillation frequency?
a) Colpitts oscillator
b) Clapp oscillator
c) Wein bridge oscillator
d) Crystal oscillator

Explanation: Crystal oscillator gives the most stable oscillation. It is the only one not consisting of R, L, C elements and does not deteriorate over time easily. It provides high stability and precision over a range of frequencies.

10. Relaxation oscillators are also known as ___________
a) Multivibrator
b) Phase shift oscillators
c) Blocking oscillators
d) Saw tooth generator

Explanation: Relaxation oscillators are also called multivibrators.

Sanfoundry Global Education & Learning Series – Analog Circuits.

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