Oscillators Objective Questions:
Oscillator Definition:
An oscillator is a mechanical or electronic device that operates according to the oscillation principle, which describes oscillation as a regular fluctuation between two objects caused by changes in energy.
Among the various gadgets that use oscillators are computers, clocks, watches, radios, and metal detectors.
An oscillator is a circuit that generates an uninterrupted, repetitive, alternating waveform without of any input.
In essence, oscillators change the unidirectional flow of current from a DC source into an alternating waveform that is of the desired frequency, as determined by its circuit components.
1. A.C. power into D.C. power
2. D.C. power into A.C. power
3. mechanical power into a.c. power
4. none of the above
Ans : 2
Q2. In an LC transistor oscillator, the active device is ……………
1. LC tank circuit
2. Biasing circuit
3. Transistor
4. None of the above
Ans : 3
Q3. An oscillator of the LC type that has a split capacitor in the circuit is
1. Hartly oscillator
2. Colpitts oscillator
3. Weinbridge oscillator
4. R-C phase shift oscillator
Ans: 2
Q4. An oscillator produces……………. oscillations
1. Damped
2. Undamped
3. Modulated
4. None of the above
Ans : 2
Q5. Multivibrators belong to the category of _____________
1. Square wave oscillators
2. Triangular wave oscillators
3. Ramp wave oscillators
4. Sinusoidal oscillators
Ans: 1
Q6. Which among the following does not belong to the category of LC oscillators?
1. Hartley oscillator
2. Colpitt's oscillator
3. Clapp oscillator
4. Wein bridge oscillator
Ans: 4
Q7.Which among the following oscillators are specifically preferred at high frequencies?
1. LC oscillators
2. RC oscillator
3. Both a and b
4. None of the above
Ans: 1
Q8.Which among the below mentioned oscillators does not adopt any kind of feedback mechanism?
1. Phase-shift oscillator
2. Wein bridge oscillator
3. UJT relaxation oscillator
4. All of the above
Ans: 3
Q9. Which is the necessary condition of gain while designing RC phase shift oscillator in order to ensure the sustained oscillations?
1. A ≥ 29
2. A ≤ 29
3. A ≠ 29
4. None of the above
Ans: 1
Q10. Hartley oscillator is commonly used in ………………
1. Radio receivers
2. Radio transmitters
3. TV receivers
4. None of the above
Ans : 1
Q11. A Wien bridge oscillator uses ……………. feedback
1. Only positive
2. Only negative
3. Both positive and negative
4. None of the above
Ans : 3
Q12. ………….. is a fixed frequency oscillator
1. Phase-shift oscillator
2. Hartely-oscillator
3. Colpitt’s oscillator
4. Crystal oscillator
Ans : 4
Q13. In Colpitt’s 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
Ans : 3
Q14. The Q of the crystal is of the order of …………
1. 100
2. 1000
3. 50
4. More than 10,000
Ans : 4
Q15. The Hartley oscillator uses
1. Negative feedback
2. Two inductors
3. A tungsten lamp
4. A tickler coil
Ans : 2
Q16. The most widely used LC oscillator is the
1. Armstrong
2. Clapp
3. Colpitts
4. Hartley
Ans : 3
Q17. The Wien-bridge oscillator is useful
1. At low frequencies
2. At high frequencies
3. With LC tank circuits
4. At small input signals
Ans : 1
Q18. A coupling circuit is a
1. Lag circuit
2. Lead circuit
3. Lead-lag circuit
4. Resonant circuit
Ans : 2
Q19. A Wien bridge is sometimes called a
1. Notch filter
2. Twin-T oscillator
3. Phase shifter
4. Wheatstone bridge
Ans : 1
Q20. To vary the frequency of a Wien bridge, you can vary
1. One resistor
2. Two resistors
3. Three resistors
4. One capacitor
Ans : 2
Q21. The phase-shift oscillator usually has
1. Two lead or lag circuits
2. Three lead or lag circuits
3. A lead-lag circuit
4. A twin-T filter
Ans : 2
Q22. Wien bridge oscillator can typically generate frequencies in the range of
1. 1kHz - 1 Mhz
2. 1 Mhz - 10MHz
3. 10MHz - 100MHz
4. 100MHz - 150MHz
Ans : 1
Q23. An important limitation of a crystal oscillator is ……………
1. Its low output
2. Its high Q
3. Less availability of quartz crystal
4. Its high output
Ans : 1
Q24. A Wien bridge oscillator uses ……………. feedback
1. Radio receivers
2. Radio transmitters
3. TV receivers
4. None of the above
Ans : 1
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