You are inspecting the blower of a...

Question 1 / 2066636eef28f7522a1c51fd20

Question 1 of 2066636eef28f7522a1c51fd20

You are inspecting the blower of a Roots-blown, two-stroke cycle main propulsion engine on the ocean-going tug to which you are assigned and discover the presence of aluminum dust on the rotors and on the air duct surfaces. What would most likely be the direct cause of this?

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🔍 Key Concepts

• Roots blower construction and materials (what parts are aluminum and what parts contact each other when things go wrong) • Effects of restricted air flow on a blower versus mechanical wear or misalignment • How bearing wear vs seal wear would physically show up inside the blower

💭 Think About

• Think about which failure mode would actually cause metal-to-metal rubbing or contact between aluminum parts inside the blower, producing aluminum dust. • Ask yourself: which option would mainly change air quantity/pressure, and which options would change the physical position or support of the rotors? • Consider what would happen to the rotor clearances if one specific component became worn, and where that material would end up.

✅ Before You Answer

• Identify which components in a Roots blower are typically aluminum and which are support components (steel shafts, bearings, seals). • Decide which listed condition would cause rotor contact with housing or with each other, rather than just lowering air flow. • Verify which problems would mainly cause airflow restriction versus mechanical interference and rubbing that could generate metallic dust.

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Question 1 of 20

Restricted scavenging air intake ports

Restricted blower air intake filter

Worn blower rotor shaft seals

Worn blower rotor shaft bearings

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Question 1 / 2066636eef28f7522a1c51fd20

Question 1 of 2066636eef28f7522a1c51fd20

Back

Question 1 of 20

66636eef28f7522a1c51fd20

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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