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Electronic Devices and Circuits - Engineering

Q1:

In which condition does BJT behave like a closed switch?

A Cut off

B Saturation

C Forward active

D Reverse active

ANS:B - Saturation

Active Region (Amplifier)
CB: Reverse Bias.
BE: Forward Bias.

Saturation Region (Short/Closed Switch)
CB: Forward Bias.
BE: Forward Bias.

Cut-Off Region (Open Switch)
CB: Reverse Bias.
BE: Revers Bias.

Reverse Active (Impractical)
CB: Forward Bias.
BE: Reverse Bias.