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In which region a transistor acts as an open switch?(a) cut off region(b) inverted region(c) active region(d) saturated regionI had been asked this question during an interview for a job.Query is from Transistor as a Switch in division Transistor Characteristics of Electronic Devices & Circuits

Answer» RIGHT option is (a) cut off region

The best EXPLANATION: In this mode, both the junctions are reverse biased. The transistor has practically zero current because the emitter does not emit charge CARRIERS to the base. There is negligibility current due to minority carriers. In this mode the transistor acts as an OPEN switch.


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