A propulsion diesel engine, having a maximum...

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Question 1 of 205eccefa1bacbc34ba4d4774e

A propulsion diesel engine, having a maximum continuous output of over 300 HP, and driving a controllable pitch propeller, must be fitted with a separate over speed device, in addition to the normal governor. This second device is to prevent the engine from exceeding the rated speed by more than __________.

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🔍 Key Concepts

• Engine overspeed protection requirements for marine diesel engines over 300 HP • Relationship between governor (normal speed control) and independent overspeed trip (safety backup) • Typical safe percentage of maximum rated speed allowed before automatic shutdown or fuel cut-off

💭 Think About

• Think about what would happen mechanically to a large diesel engine and controllable pitch propeller if speed were allowed to rise too much above the rated value. • Which choice looks like a realistic percentage margin for a safety shutdown device, rather than normal speed variation? • Compare the answer choices: some look like percentages, some look like decimal fractions. How are engine overspeed limits usually expressed in marine regulations and manufacturer manuals?

✅ Before You Answer

• Identify which options are clearly percentage ranges and which might represent fractions that are unrealistically small or large for overspeed protection. • Consider what overspeed limit would both protect the engine and still allow for brief transient speed increases without nuisance trips. • Before choosing, ask: “Would this value be commonly used in class rules or engine maker specs for overspeed trip settings on large marine diesels?”

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