# Electronics - Logic Gates - Discussion

### Discussion :: Logic Gates - General Questions (Q.No.3)

3.

A single transistor can be used to build which of the following digital logic gates?

 [A]. AND gates [B]. OR gates [C]. NOT gates [D]. NAND gates

Answer: Option C

Explanation:

No answer description available for this question.

 Zakaiter said: (Jan 20, 2011) Becoz it has only 1 i/p and gives 1 o/p.

 Binoy Tomy said: (Mar 29, 2011) Transistors can be PNP or NPN. PN or NP means simply PN junction diode which will act as NOT gate. Not because of the reason stated above to my knowledge.

 Swaroop said: (Sep 26, 2011) Because transistor act as a inverter.

 Ashish Singhal said: (Oct 18, 2011) NOT Gate is like an inverter it is because when we gives one to the input of not gate we get zero i.e, inverts of the input.

 Sonu said: (Aug 21, 2012) But when gate supply zero how transistor output will be one?

 Right?? said: (Mar 18, 2013) All the above answers not completely true. Answer is. A transistor can be used as a switch. That is, when base is low collector is high (input zero, output one) and base is high collector is low (input 1, output 0).

 Abhimanyu said: (Jul 16, 2013) We can use the transistor in CE configuration and use say a resistor or a diode connected BJT as load and take the output from the collector of the BJT.

 Pooja said: (Jul 31, 2013) Transistor is acts as a switch means it is used for ON and OFF. This is can be done by using NOT gate.

 A.Mohamed Imrankhan said: (Feb 23, 2014) Transistor is generally used for current amplification. Whenever, the transistor input is high(1) it produces output as low (0) and vice versa. Therefore the single transistor is enough to built NOT gate.

 M.P. Gunalan said: (Mar 5, 2015) A transistor is a simple switch so it can be employed to construct logic gates.

 Saidamacharla said: (Sep 10, 2018) The Transistor can be used as a switch. So the switch is on and off. It is an inverter. So the answer is Not gate.

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