JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 26 June 2022, Shift 2, Physics Q49

Question 49 of 90 in this shift, Physics question 19 of 30, Section A.

The positive feedback is required by an amplifier to act an oscillator. The feedback here means :

(1)External input is necessary to sustain ac signal in output.
(2)A portion of the output power is returned back to the input.Official answer
(3)Feedback can be achieved by LR network.
(4)The base-collector junction must be forward biased.

Official answer

Option 2

NTA final key.

Chapter: Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic: Transistors
Idea tested: Transistor as an Oscillator

Same topic in other shifts

All Transistors questions

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28 Jul 2022, Shift 2 · Q19An n.p.n transistor with current gain $\beta$ = 100 in common emitter configuration is shown in figure. The output voltage of the…MediumSingle correctHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.