Oscillator Basics

An oscillator converts ……………

• a. c. power into d.c.power

• d.c. power into a.c. power

• mechanical power into a.c. power

• none of the above

An oscillator produces……………. oscillations

• Damped

• Undamped

• Modulated

• None of the above

An oscillator employs ……………… feedback

• Positive

• Negative

• Neither positive nor negative

• Data insufficient

An oscillator differs from an amplifier because it ………

• Has more gain

• Requires no input signal

• Requires no d.c. supply

• Always has the same input

One condition for oscillation is ………….

• A phase shift around the feedback loop of 180

• A gain around the feedback loop of one-third

• A phase shift around the feedback loop of 0

• A gain around the feedback loop of less than 1

A second condition for oscillations is ……………….

• A gain of 1 around the feedback loop

• No gain around the feedback loop

• The attention of the feedback circuit must be one-third

• The feedback circuit must be capacitive

Which among the below-mentioned oscillators does not adopt any kind of feedback mechanism?

• Wein bridge oscillator

• UJT relaxation oscillator

• Phase-shift oscillator

• All of the above

Which of the following is the main advantage of using oscillators?

• Suitability for low voltages

• High output voltage

• Constant frequency of oscillations

• High frequency

In oscillator circuits the energy feedback to its input terminal from output is

• Always in phase with the input signal

• 270⁰ out of phase with the input signal

• 180⁰ out of phase with the input signal

• 90⁰ out of phase with the input signal

Oscillations occur with

• Positive feedback having unity loop

• Positive feedback having unity loop gain

• Negative feedback having unity loop gain

• None of the above