Question id 292 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

The throttle controls power output as registered on the manifold pressure gauge and the propeller control regulates a constant blade angle.
The throttle controls power output as registered on the manifold pressure gauge and the propeller control regulates engine RPM.
The throttle controls engine RPM as registered on the tachometer and the mixture control regulates the power output.

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane