Whenever you have a circuit with npn transistors,you can often use the same circuit with pnp transistors and
A) a negative power supply.
B) and an ac source.
C) a positive power supply.
D) a floating ground.

Question

Quizplus · Accepted Answer

NPN and PNP transistors are complementary. When switching from an NPN to a PNP transistor in a circuit, the polarity of the power supply must be reversed, hence a negative power supply is used with PNP transistors if the original circuit with NPN transistors used a positive power supply.

Whenever You Have a Circuit with Npn Transistors,you Can Often