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. 

Q 1. An oscillator converts ……………..

    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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