Which of the following is not a valid type of BJT?(a) PNP(b) NPN(c) PPN(d) NNPThis question was addressed to me during an interview.I'd like to ask this question from BJT Construction and Operation in section BJT Biasing of Analog Circuits

Which of the following is not a valid type of BJT?(a) PNP(b) NPN(c) PP

1.	Which of the following is not a valid type of BJT?(a) PNP(b) NPN(c) PPN(d) NNPThis question was addressed to me during an interview.I'd like to ask this question from BJT Construction and Operation in section BJT Biasing of Analog Circuits
Answer» The correct choice is (C) PPN Easy explanation: A BJT is a DEVICE with a layer of semiconductor sandwiched between 2 unlike types of semiconductors and hence, PPN is not a VALID type of a BJT.

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