Question 53Motor Plants - 1st Asst/Chief

The correct answer is D) Compressed air. The compressed air starting system for internal combustion engines uses a vane-type fluid motor to start the engine. This system utilizes compressed air stored in a tank to spin the engine's flywheel and initiate the starting process. The vane-type fluid motor is an essential component that converts the compressed air into rotational motion to crank the engine. The other options are incorrect because jet flow and centrifugal systems are not commonly used for starting internal combustion engines, and electric starting systems use battery-powered electric motors, not a vane-type fluid motor.