Oscillators MCQ Questions and Answers for Practice

1. A Wien bridge oscillator uses .............. feedback

1. Only positive
2. Only negative
3. Both positive and negative
4. None of the above

2. An LC oscillator cannot be used to produce .............. frequencies

1. High
2. Audio
3. Very low
4. Very high

3. An oscillator converts

1. power into d.power
2. power into a.power
3. mechanical power into a.power
4. none of the above

4. An oscillator differs from an amplifier because it

1. Has more gain
2. Requires no input signal
3. Requires no d.supply
4. Always has the same input

5. An oscillator employs .............. feedback

1. Positive
2. Negative
3. Neither positive nor negative
4. Data insufficient

6. An oscillator produces .............. oscillations

1. Damped
2. Undamped
3. Modulated
4. None of the above

7. For an oscillator to properly start, the gain around the feedback loop must initially be

1. 1
2. Greater than 1
3. Less than 1
4. Equal to attenuation of feedback circuit

8. Hartley oscillator is commonly used in

1. Radio receivers
2. Radio transmitters
3. TV receivers
4. None of the above

9. In a phase shift oscillator, we use .............. RC sections

1. Two
2. Three
3. Four
4. None of the above

10. In Colpitts oscillator, feedback is obtained

1. By magnetic induction
2. By a tickler coil
3. From the centre of split capacitors
4. None of the above

11. Oscillators must employ

1. Possitive feedback
2. Negative feedback
3. Neither negative nor positive feedbacks
4. None of the above

12. Quartz crystal is most commonly used in crystal oscillators because

1. It has superior electrical properties
2. It is easily available
3. It is quite inexpensive
4. None of the above

13. The Q of the crystal is of the order of

1. 100
2. 1000
3. 50
4. More than 10,000

14. The signal generator generally used in the laboratories is .............. oscillator

1. Wien-bridge
2. Hartely
3. Crystal
4. Phase shift

15. What percentage of feedback will cause oscillations?

1. 0.20%
2. 0.50%
3. 1.50%
4. 2%