Assuming at least a 500 rpm for the input...

Question 1 / 2066636eed28f7522a1c51de28

Question 1 of 2066636eed28f7522a1c51de28

Assuming at least a 500 rpm for the input shaft speed from the power turbine, as shown in the illustration, the synchronous self-shifting (SSS) clutch used on marine gas turbine main propulsion gears, requires which of the following inputs or conditions to make engagement possible? Illustration GT-0018

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Question 1 of 20

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🔍 Key Concepts

• Operation of a synchronous self‑shifting (SSS) clutch and why it is called “synchronous” and “self‑shifting”. • Difference between mechanical clutches and air-operated or hydraulically-operated clutches in marine propulsion gears. • Relationship between input shaft speed and output shaft speed needed for torque to be transmitted without shock loading.

💭 Think About

• Look closely at the illustration: do you see any obvious air chambers, air hoses, or inflation bladders that would be needed for an air clutch? What does that suggest about how this clutch is actuated? • Why would a synchronous clutch care about the relative speeds of the input and output shafts? What happens inside the clutch if one is significantly faster or slower than the other? • For smooth engagement and to avoid gear damage, should the driving member be trying to take hold when it is much faster, much slower, or very close in speed to the driven member?

✅ Before You Answer

• Verify whether an SSS clutch is normally purely mechanical or requires external air pressure for engagement. • Check which options describe a condition where input and output speeds are closely matched, allowing dogs or teeth to mesh without shock. • Eliminate any choices that would obviously cause severe shock or reverse loading on the gear train when the clutch tries to engage.

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Question 1 of 20

Availability of low-pressure air to provide control air pressure for engagement.

Availability of high-pressure air to provide clutch air inflation pressure.

When the input shaft speed from the power turbine falls below the output shaft speed.

When the input shaft speed from the power turbine rises to the output shaft speed.

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Question 1 / 2066636eed28f7522a1c51de28

Question 1 of 2066636eed28f7522a1c51de28

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Question 1 of 20

66636eed28f7522a1c51de28

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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