Oscillators MCQs with Explanations

In order for an oscillator to start and sustain oscillations, the gain around the feedback loop must meet specific criteria. The criteria for proper oscillation are as follows: The gain around the feedback loop must be equal to or greater than 1 . This means that the gain should be sufficient to compensate for the losses in the feedback loop, so the signal can build up and sustain itself in an oscillatory manner. Therefore, the correct answer is: Option B: Greater than 1

Inversely proportional to square root of is the correct answer to “In an LC oscillator, the frequency of oscillator is ___________ L or C.”. This question is standard in competitive examination syllabi for Oscillators.

It has superior electrical properties is the correct answer to “Quartz crystal is most commonly used in crystal oscillators because ___________”. This question is standard in competitive examination syllabi for Oscillators.

2 is the correct answer to “In a certain oscillator Av = 50. The attention of the feedback circuit must be ___________”. This question is standard in competitive examination syllabi for Oscillators.

Radio receivers is the correct answer to “Hartley oscillator is commonly used in ___________”. This question is standard in competitive examination syllabi for Oscillators.

High Q is the correct answer to “The crystal oscillator frequency is very stable due to ___________ of the crystal”. This question is standard in competitive examination syllabi for Oscillators.

Undamped is the correct answer to “An oscillator produces___________ oscillations”. This question is standard in competitive examination syllabi for Oscillators.

Very low is the correct answer to “An LC oscillator cannot be used to produce ___________ frequencies”. This question is standard in competitive examination syllabi for Oscillators.

Three is the correct answer to “In a phase shift oscillator, we use ___________ RC sections”. This question is standard in competitive examination syllabi for Oscillators.

Wien-bridge is the correct answer to “The signal generator generally used in the laboratories is ___________ oscillator”. This question is standard in competitive examination syllabi for Oscillators.

Positive is the correct answer to “An oscillator employs ___________ feedback”. This question is standard in competitive examination syllabi for Oscillators.

Both positive and negative is the correct answer to “A Wien bridge oscillator uses ___________ feedback”. This question is standard in competitive examination syllabi for Oscillators.

Requires no input signal is the correct answer to “An oscillator differs from an amplifier because it”. This question is standard in competitive examination syllabi for Oscillators.

A phase shift around the feedback loop of 0° is the correct answer to “One condition for oscillation is ___________”. This question is standard in competitive examination syllabi for Oscillators.

d.c. power into a.c. power is the correct answer to “An oscillator converts ___________”. This question is standard in competitive examination syllabi for Oscillators.

R and C is the correct answer to “In a phase shift oscillator, the frequency determining elements are ___________”. This question is standard in competitive examination syllabi for Oscillators.

Transistor is the correct answer to “In an LC transistor oscillator, the active device is ___________”. This question is standard in competitive examination syllabi for Oscillators.

Crystal oscillator is the correct answer to “___________ is a fixed frequency oscillator”. This question is standard in competitive examination syllabi for Oscillators.

Radio transmitter is the correct answer to “The application where one would most likely find a crystal oscillator is ___________”. This question is standard in competitive examination syllabi for Oscillators.

Its low output is the correct answer to “An important limitation of a crystal oscillator is ___________”. This question is standard in competitive examination syllabi for Oscillators.

Minimum is the correct answer to “In an LC circuit, when the capacitor is maximum, the inductor energy is ___________”. This question is standard in competitive examination syllabi for Oscillators.

From the centre of split capacitors is the correct answer to “In Colpitt's oscillator, feedback is obtained ___________”. This question is standard in competitive examination syllabi for Oscillators.

More than 10,000 is the correct answer to “The Q of the crystal is of the order of ___________”. This question is standard in competitive examination syllabi for Oscillators.

Positive is the correct answer to “If the crystal frequency changes with temperature, we say that crystal has ___________ temperature coefficient”. This question is standard in competitive examination syllabi for Oscillators.

Increases is the correct answer to “In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency ___________”. This question is standard in competitive examination syllabi for Oscillators.

A gain of 1 around the feedback loop is the correct answer to “A second condition for oscillations is ___________”. This question is standard in competitive examination syllabi for Oscillators.

Decreased 2 times is the correct answer to “In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is ___________”. This question is standard in competitive examination syllabi for Oscillators.

A voltage developed because of mechanical stress is the correct answer to “The piezoelectric effect in a crystal is ___________”. This question is standard in competitive examination syllabi for Oscillators.