The main propulsion main engines on the...

Question 1 / 2066636eef28f7522a1c51fee4

Question 1 of 2066636eef28f7522a1c51fee4

The main propulsion main engines on the ship-docking tug to which you are assigned are fitted with turbochargers as shown in the illustration. What statement is true concerning the over-running clutch and gear-drive train as fitted to this turbocharger type? Illustration MP-CA-08

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🔍 Key Concepts

• How an over-running clutch works in general (what happens when the driven shaft starts turning faster than the drive shaft) • Why a diesel engine may need mechanical assistance for turbocharger speed at low load and while starting • Under what condition a turbocharger can be entirely exhaust-gas driven without help from gears

💭 Think About

• Look at the gear train and over-running clutch in the illustration: when the engine is just starting and exhaust flow is low, would the turbo reach operating speed on its own, or need help? • Once the engine is at high load and exhaust flow is strong, will the turbo shaft tend to turn slower than, the same as, or faster than the gear drive from the engine? What does that do to an over-running clutch? • For each answer choice, ask yourself: is the mechanical drive the main drive all the time, only at low load, only at high load, or almost never?

✅ Before You Answer

• Be sure you understand that an over-running clutch transmits torque only when the drive side is faster than the driven side; when the driven side is faster, it free-wheels. • Verify which operating range (low load vs. high load) has insufficient exhaust energy to spin the turbo without help. • Eliminate any options that contradict the basic function of a turbocharger, which is to be primarily exhaust-gas driven once the engine is producing enough exhaust.

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Question 1 of 20

The turbocharger is gear-driven under all engine load and starting conditions, and as such is considered both exhaust gas and mechanically driven.

The turbocharger is free-wheeling and exhaust gas driven under all engine load and starting conditions, and mechanical drive arrangements are for emergency use only.

The turbocharger is gear-driven from the engine under low load and starting conditions only. Under high load conditions, the turbocharger is free-wheeling and exhaust gas driven.

Question 1 / 2066636eef28f7522a1c51fee4

Question 1 of 2066636eef28f7522a1c51fee4

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Question 1 of 20

66636eef28f7522a1c51fee4

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💭 Think About

✅ Before You Answer

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