Which of the following pneumatic motor type has a swash plate?

The correct answer is a piston type pneumatic motor, which incorporates a swash plate design. In this type of motor, the swash plate converts the rotary motion of the input shaft into linear motion, causing the pistons to move in and out of their cylinders. As the swash plate tilts, it varies the angle at which the pistons are driven, allowing for efficient conversion of compressed air energy into mechanical work. This design is particularly advantageous because it can provide high torque at various speeds by adjusting the angle of the swash plate, making it versatile for different applications.

Other types of pneumatic motors, such as sliding valve, gear, and turbine, do not utilize a swash plate mechanism. Sliding valve motors focus on directing airflow but do not involve the swash plate's angle adjustments. Gear motors rely on meshing gears for motion without the need for a swash plate. Turbine motors use blades to harness airflow and convert it into rotational motion, again without the swash plate configuration. Thus, the presence of the swash plate in piston-type pneumatic motors is what sets them apart as the correct choice for this question.