AIIMS 2019 Physics Feedback in Oscillators Assertion Reason Question
Assertion: Positive feedback is essential for converting a transistor into an oscillator. Reason: Positive feedback works between cut-off and saturation region.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is true because positive feedback is indeed crucial for a transistor to function as an oscillator, as it reinforces the oscillation process. However, the reason is misleading; while positive feedback is necessary, it does not specifically operate between the cut-off and saturation regions, which are simply the extremes of a transistor's operation. Option A is incorrect because the reason does not correctly explain the assertion. Option C is incorrect since the assertion is true, and option D is incorrect as both statements are not false. Understanding the role of feedback in oscillator circuits is vital for grasping how transistors can be utilized in various electronic applications.
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