🔍 Key Concepts

• Compare the internal parts to what you would expect in a motor versus a compressor (look for pistons vs. armature/rotor and reduction gearing). • Notice the presence of a pinion gear and drive shaft assembly intended to engage with another piece of machinery (such as an engine flywheel). • Think about whether an air supply would be used as the power source or as the output of this device.

💭 Think About

• Which of the choices would realistically need a pinion gear and overrunning clutch to briefly engage another rotating component? • If this were an air compressor or hydraulic pump, what kind of inlet/outlet ports and pumping elements (vanes, pistons, pumping chambers) would you expect to see in the exploded view, and do you see them here? • Which option best matches a device whose primary purpose is to provide short bursts of high torque rather than continuous flow or power generation?

✅ Before You Answer

• Identify the gear train and pinion that would mesh with an engine flywheel ring gear. • Check whether you can find any commutator, field windings, or electrical terminals that would be present on a DC generator or electric motor. • Look for the absence or presence of compressor or pump stages (cylinders, vanes, pumping chambers) that would be necessary for a compressor or hydraulic pump.