🔍 Key Concepts

• Compare the internal parts shown (armature, windings, pinion gear, and solenoid) to common starting systems used on small and medium diesel engines. • Think about what usually supplies energy to a cranking motor that has an armature and field windings, as opposed to an air motor or hydraulic motor. • Recall which starting systems (air, electric, fuel, hydraulic) use rotating electrical machinery versus purely fluid pressure.

💭 Think About

• What features in the illustration tell you this is an electrical machine rather than an air or hydraulic motor (look closely at the copper windings and the cylindrical rotor)? • If this device converts electrical energy into mechanical torque, which of the listed options normally stores that electrical energy on a tug? • Which listed options would store potential energy as pressure instead of electricity, and do you see any air or hydraulic piping or reservoirs on this drawing?

✅ Before You Answer

• Identify whether the large central component is an electric armature with windings and a commutator, or a fluid-driven rotor. • Check if there is any sign of air valves, fluid pistons, or piping that would connect to a compressed air or hydraulic source. • Confirm which option in the list is specifically designed to store DC electrical energy for supplying a cranking motor.