🔍 Key Concepts

• Duplex filter design and how many filter chambers it has • What is meant by continuous operation for a diesel engine • How oil flow can be maintained while changing filter elements

💭 Think About

• Think about what happens to oil flow if you have only one filter and you need to change its element while the engine is running. • Consider the actual internal piping of a duplex filter: how does the selector (or changeover) valve affect which filter is in use? • Which options describe something that can be guaranteed by design, and which sound unrealistic in real-world operation?

✅ Before You Answer

• Verify how many filters are in a duplex unit and whether they can be isolated individually. • Check whether any design can eliminate clogging entirely, or only manage it. • Consider which choice directly supports uninterrupted engine operation during maintenance.