What is a BJT amplifier?
Bilpolar Juntion transistor , this fuction is control the current
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Description : How can BJT be used as an amplifier?

Answer : Active region of BJT act as amplifier.

Description : What is the difference between BJT and FET?

Answer : BJT  is  a  current  opperated   transistor  while  FET   is  a  field   opperated  transistor.

Description :  If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be A) 0.98 B) 0.41 C) 59 D) 55  

Answer :  If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be 0.98 

Description : What is a BJT?

Answer : Bipolar Junction Transistor (BJT): BJT is a Bipolar device. (Uses both electrons and holes charge carrier for current conduction) Two Junctions (Emitter junction & collector ... mode (Current amplification) Cutoff mode (Open switch) Saturation mode (Close switch)