Two different types of transmission shaft and coupling and two kinds of brake and clutch that can be found in engineering systems?

Two types of transmission shafts commonly used in engineering systems are the propeller shaft, which transfers power from the engine to the wheels in vehicles, and the cardan shaft, often used in heavy machinery for transmitting torque at varying angles. For couplings, flexible couplings are used to connect shafts while accommodating misalignment, and rigid couplings provide a more fixed connection. In terms of brakes, disc brakes are widely used in vehicles for their effective stopping power, while drum brakes are often found in older vehicles and some industrial applications. As for clutches, friction clutches are commonly used in manual transmissions to engage and disengage power, while electromagnetic clutches provide a quick and reliable means to engage and disengage loads in various machinery.