The two-stroke cycle main propulsion engines...

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Question 1 of 2066636eef28f7522a1c520410

The two-stroke cycle main propulsion engines on the supply boat to which you are assigned are fitted with Roots-type blowers for scavenging purposes. Upon inspection of the air boxes, what condition would indicate a need to replace the Roots-type blower immediately?

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Question 1 of 20

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🔍 Key Concepts

• Roots-type blower construction (what are the rotors and housing usually made of?) • Air box inspection findings (what types of deposits are normal vs. dangerous?) • Evidence of blower internal wear or rubbing (what residue tells you parts are grinding on each other?)

💭 Think About

• Think about which type of accumulation or residue would most clearly show that moving parts inside the blower are physically contacting and wearing each other away. • Consider what metals are commonly used in Roots blower casings and rotors on main propulsion engines, and what color/texture residue they would leave. • Ask yourself: which option would suggest a serious, ongoing mechanical failure rather than just contamination from the engine or environment?

✅ Before You Answer

• Verify which material (iron vs. aluminum) is typically used in Roots blower casings and rotors on marine diesel engines. • Check which deposits (water, oil) might be relatively common in an engine air system versus those that directly signal internal metal-to-metal contact. • Before choosing, be sure your option points to a condition that would require immediate replacement, not just cleaning or maintenance.

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