Junction Transistor
The above figure shows the circuit symbol of a transistor. Select the correct statements given below:
(A) The transistor has two segments of p-type semiconductor separated by a segment of n-type semiconductor.
(B) The emitter is of moderate size and heavily doped.
(C) The central segment is thin and lightly doped.
(D) The emitter base junction is reverse biased in common emitter amplifier circuit.
Show answer and solution
Answer: (d)
- The arrow on the emitter points outward, so the symbol is of an n-p-n transistor.
- (A) False: two p-regions separated by n is a p-n-p transistor.
- (B) True: emitter is of moderate size and heavily doped.
- (C) True: base is very thin and lightly doped.
- (D) False: in a CE amplifier the emitter-base junction is forward biased.
- So the answer is (d) (B) and (C).