Under normaI use of transistors, the emitter is forwerd biased whiIe the coIIector is reverse biased. Can either of these biasing be changed? ExpIain.

Explanation

No, it cannot be changed.
(i) If the emitter is reversed biased no majority charge carrier would reach the base. So, if both the emitter and collector are reverse biased there would be no current through the transistor.
(ii) When both the emitter and collector are forward biased, majority carriers would enter the base from both of these. So two separate circuits i.e one emitter-base and the other collector-base circuit will be formed and the purpose of the transistor will not be served.
(iii) If the emitter is reverse biased and the collector is forward biased, then the transistor will perform in the opposite direction i.e the emitter will become the collector and collector will becomes the emitter.