🔍 Key Concepts

• Operation of an auxiliary boiler return flow fuel oil system • Purpose and design of whirling chambers in sprayer or atomizer plates • How tangential flow creates a swirling or whirling fuel pattern

💭 Think About

• Which part of the sprayer/atomizer is specifically designed to give the fuel spin before it leaves the nozzle? • Look at each option and ask: does this feature mainly direct fuel to the chamber, or does it mainly support/hold/shape other parts? • In a whirling chamber design, how is the fuel introduced so that it forms a vortex or cone-shaped spray as it exits?

✅ Before You Answer

• Identify which option refers to a feature that introduces fuel sideways into the chamber rather than straight through it • Confirm which component is directly associated with the swirling or spinning action inside the whirling chamber • Eliminate any options that describe parts which mainly act as supports, passages, or flow restrictors rather than swirl inducers