🔍 Key Concepts

• Think about how pneumatic (air-driven) motors produce rotation from compressed air. • Recall the simplest, most rugged type of air motor commonly used in marine applications for starting engines. • Consider which motor types (plunger, gear, vane, accumulator) are normally associated with hydraulic systems, fuel systems, or energy storage, not air starting.

💭 Think About

• Which of these motor types can easily start and stop quickly, tolerate moisture and dirt in the air, and still be reliable for emergency starting? • Which option describes a motor where moving surfaces are pushed around by air pressure inside a chamber, rather than using gears or pistons in cylinders? • Which choice is more commonly seen in air tools and air-driven equipment that require smooth, continuous rotation from compressed air?

✅ Before You Answer

• Eliminate any option that is more commonly related to hydraulic pumps or fuel injection systems rather than air motors. • Ask yourself: which design has few moving parts and good starting torque – a key requirement for air starting diesels? • Verify which of these motor types is widely used in industrial pneumatic tools, as that same principle is used for air-start motors.