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If the positive lead of a DMM, with the mode set to ohmmeter is connected to the base and the negative lead to the emitter and a low resistance reading is obtained, then what is the type of transistor that is being tested?(a) NPN(b) PNP(c) Faulty transistor(d) Not a transistor, it is a FETThis question was posed to me in an interview for internship.My doubt stems from Limits of Operation in portion BJT Biasing of Analog Circuits

Answer»

Right option is (a) NPN

The EXPLANATION: There are MULTIPLE ways to TEST the BJT to be npn or pnp using a DMM based upon which terminals are connected to which lead of the DMM. If positive is to base and negative to the EMITTER of the BJT, and if a low READING is obtained and not a over limit, then the transistor is NPN.



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