Oscillators MCQs

1.What type of oscillations does an ideal oscillator generate?

Oscillations that gradually decrease in amplitudeOscillations that maintain constant amplitudeOscillations with varying frequencyNo oscillations at allOscillations that increase over time

2.When the frequency of a crystal varies as the temperature changes, what type of temperature coefficient does the crystal exhibit?

3.Which type of frequency is unsuitable for generation using an LC oscillator?

4.In an LC transistor oscillator, which component acts as the active device?

5.What type of feedback is used in an oscillator circuit?

6.How many RC sections are typically employed in a phase shift oscillator circuit?

7.In which device is a crystal oscillator most commonly utilized?

A radio signal receiverA radio signal transmitterAn audio frequency sweep generatorNone of these

8.An oscillator has an amplifier gain (Av) of 50. What should be the attenuation factor of the feedback network?

9.Which type of oscillator operates at a constant, fixed frequency?

Oscillator using phase shift networkOscillator based on Hartley circuitOscillator utilizing Colpitts configurationOscillator employing a crystal resonator

10.What is a significant drawback of using a crystal oscillator?

It produces a low output signalIt has a very high quality factor (Q)Quartz crystals are not widely accessibleIt generates a high output signalNone of the above

11.What is the typical quality factor (Q) value for a crystal?

12.In a Wien-bridge oscillator, what happens to the oscillation frequency if the resistors in the positive feedback network are reduced?

13.What is the second essential condition required for sustained oscillations in a feedback system?

The loop gain must be exactly equal to oneThere should be zero gain in the feedback loopThe feedback factor needs to be one-thirdThe feedback network has to be capacitive

14.What distinguishes an oscillator from an amplifier?

Possesses higher gainOperates without an input signalDoes not need a direct current power sourceMaintains a constant input

15.What describes the piezoelectric effect observed in crystals?

An electric voltage generated due to applied mechanical pressureA variation in electrical resistance caused by temperature changesA shift in frequency resulting from temperature fluctuationsNone of the listed options

16.In an LC circuit, what is the energy stored in the inductor when the capacitor's energy reaches its peak?

At its lowest pointAt its highest pointExactly midway between highest and lowestDoes not correspond to any of these

17.What type of feedback is utilized in a Wien bridge oscillator?

18.Why is quartz crystal the preferred choice in crystal oscillators?

It possesses excellent electrical characteristicsIt is widely accessibleIt is very cost-effectiveNone of these