Multiple Choice Questions and Answers on Oscillators
Multiple Choice Questions and Answers on Oscillators
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- Question Bank in Electronics & Communication Engineering by Prem R Chadha
- A Handbook on Electronics Engineering – Illustrated Formulae & Key Theory Concepts
Q1. An oscillator converts ……………..
- c. power into d.c. power
- c. power into a.c. power
- mechanical power into a.c. power
- none of the above
Answer : 2
Q2. In an LC transistor oscillator, the active device is ……………
- LC tank circuit
- Biasing circuit
- Transistor
- None of the above
Answer : 3
Q3. In an LC circuit, when the capacitor is maximum, the inductor energy is ……….
- Minimum
- Maximum
- Half-way between maximum and minimum
- None of the above
Answer : 1
Q4. In an LC oscillator, the frequency of oscillator is ……………. L or C.
- Proportional to square of
- Directly proportional to
- Independent of the values of
- Inversely proportional to square root of
Answer : 4
Q5. An oscillator produces……………. oscillations
- Damped
- Undamped
- Modulated
- None of the above
Answer : 2
Q6. An oscillator employs ……………… feedback
- Positive
- Negative
- Neither positive nor negative
- Data insufficient
Answer : 1
Q7. An LC oscillator cannot be used to produce ……………….. frequencies
- High
- Audio
- Very low
- Very high
Answer : 3
Q8. Hartley oscillator is commonly used in ………………
- Radio receivers
- Radio transmitters
- TV receivers
- None of the above
Answer : 1
Q9. In a phase shift oscillator, we use …………. RC sections
- Two
- Three
- Four
- None of the above
Answer : 2
Q10. In a phase shift oscillator, the frequency determining elements are …………
- L and C
- R, L and C
- R and C
- None of the above
Answer : 3
Q11. A Wien bridge oscillator uses ……………. feedback
- Only positive
- Only negative
- Both positive and negative
- None of the above
Answer : 3
Q12. The piezoelectric effect in a crystal is ……………
- A voltage developed because of mechanical stress
- A change in resistance because of temperature
- A change in frequency because of temperature
- None of the above
Answer : 1
Q13. If the crystal frequency changes with temperature, we say that crystal has ………….. temperature coefficient
- Positive
- Zero
- Negative
- None of the above
Answer : 1
Q14. The crystal oscillator frequency is very stable due to ………………. of the crystal
- Rigidity
- Vibrations
- Low Q
- High Q
Answer : 4
Q15. The application where one would most likely find a crystal oscillator is ……………..
- Radio receiver
- Radio transmitter
- AF sweep generator
- None of the above
Answer : 2
Q16. 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
Answer : 2
Q17. One condition for oscillation is ………….
- A phase shift around the feedback loop of 180o
- A gain around the feedback loop of one-third
- A phase shift around the feedback loop of 0o
- A gain around the feedback loop of less than 1
Answer : 3
Q18. 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
Answer : 1
Q19. In a certain oscillator Av = 50. The attention of the feedback circuit must be …………
- 1
- 01
- 10
- 02
Answer : 4
Q20. For an oscillator to properly start, the gain around the feedback loop must initially be
- 1
- Greater than 1
- Less than 1
- Equal to attenuation of feedback circuit
Answer : 2
Q21. In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency……….
- Remains the same
- Decreases
- Increases
- Insufficient data
Answer : 3
Q22. In Colpitt’s oscillator, feedback is obtained …………….
- By magnetic induction
- By a tickler coil
- From the centre of split capacitors
- None of the above
Answer : 3
Q23. The Q of the crystal is of the order of …………
- 100
- 1000
- 50
- More than 10,000
Answer : 4
Q24. Quartz crystal is most commonly used in crystal oscillators because ………….
- It has superior electrical properties
- It is easily available
- It is quite inexpensive
- None of the above
Answer : 1
Q25. This question will be available soon
Q26. This question will be available soon
Q27. ………….. is a fixed frequency oscillator
- Phase-shift oscillator
- Hartely-oscillator
- Colpitt’s oscillator
- Crystal oscillator
Answer : 4
Q28. In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is …………
- Increased 2 times
- Decreased 4 times
- Increased 4 times
- Decreased 2 times
Answer : 4
Q29. An important limitation of a crystal oscillator is ……………
- Its low output
- Its high Q
- Less availability of quartz crystal
- Its high output
Answer : 1
Q30. The signal generator generally used in the laboratories is ………….. oscillator
- Wien-bridge
- Hartely
- Crystal
- Phase shift
Answer : 1
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