In n-p-n transistor, the p-type crystal act as
base only
collector only
emitter only
either emitter or collector
n-p-n transistor has three leads A, B and C. Connecting B and C by moist fingers, A to the positive lead of an ammeter, and C to the negative lead of the ammeter, one finds large deflection. Then, A, B and C refer respectively to : (1) Emitter, base and collector (2) Base, emitter and collector (3) Base, collector and emitter (4) Collector, emitter and base.