Test: Introduction to Oscillator

# Test: Introduction to Oscillator

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## 10 Questions MCQ Test Analog Circuits | Test: Introduction to Oscillator

Test: Introduction to Oscillator for Electronics and Communication Engineering (ECE) 2022 is part of Analog Circuits preparation. The Test: Introduction to Oscillator questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Introduction to Oscillator MCQs are made for Electronics and Communication Engineering (ECE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Introduction to Oscillator below.
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Test: Introduction to Oscillator - Question 1

### Oscillators are used to ______ AC voltage.

Detailed Solution for Test: Introduction to Oscillator - Question 1
• Oscillators are used for generating AC voltage. They are often characterized by the frequency of the oscillations produced.
• There are two main types of electronic oscillators, linear/harmonic and nonlinear/relaxation oscillator.
Test: Introduction to Oscillator - Question 2

### Oscillator ________ an AC input for giving an AC output.

Detailed Solution for Test: Introduction to Oscillator - Question 2
• An oscillator is an amplifier with positive feedback. It usually has a noise which is an amplifier as an oscillating output.
• They do not require any type of specific input to function properly.
Test: Introduction to Oscillator - Question 3

### Negative resistance are incorporated in oscillator for _______.

Detailed Solution for Test: Introduction to Oscillator - Question 3

Negative resistance are incorporated in oscillator for sustained oscillation. Negative resistance will cancel the damping by positive (normal) resistance.

Test: Introduction to Oscillator - Question 4

For accomplishing negative resistance in oscillator we use ________.

Detailed Solution for Test: Introduction to Oscillator - Question 4
• The input or output impedance of an amplifier with positive feedback applied, can be negative.
• When loop gain is greater than 1, the input impedance is a negative value, over a linear range. These are also called active resistors.
Test: Introduction to Oscillator - Question 5

Primary trigger for oscillation is obtained from _______.

Detailed Solution for Test: Introduction to Oscillator - Question 5

The primary trigger for oscillation is obtained from noise voltage.

Test: Introduction to Oscillator - Question 6

The AC power of output signal is obtained by _______.

Detailed Solution for Test: Introduction to Oscillator - Question 6

The Ac power of output signal is obtained by DC biasing voltage of amplifier.

Test: Introduction to Oscillator - Question 7

The output of a stable oscillator has _______.

Detailed Solution for Test: Introduction to Oscillator - Question 7
• Output of a stable oscillator have constant amplitude and frequency.
• A common criteria is the Barkhausen stability criteria, wherein it states that loop gain should be unity and feedback should be positive.
Test: Introduction to Oscillator - Question 8

The output waveform of a stable oscillator have:

Detailed Solution for Test: Introduction to Oscillator - Question 8

Output of a stable oscillator have constant amplitude and frequency.

Test: Introduction to Oscillator - Question 9

In an oscillator if phase of feedback is same as that of oscillation waveform then feedback is called ________.

Detailed Solution for Test: Introduction to Oscillator - Question 9

In an oscillator if phase of feedback is same as that of oscillation waveform then feedback is called positive feedback.

Test: Introduction to Oscillator - Question 10

The output of oscillator will not depend upon ________.

Detailed Solution for Test: Introduction to Oscillator - Question 10

The output of oscillator will not depend upon input voltage. There is no input voltage for an oscillator.

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