You are assigned to an anchor handling...

Question 1 of 31048fy_heal_CREATE_q680_2022

You are assigned to an anchor handling vessel fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. What combustion cycle event has a duration of 103°? Illustration MO-0206

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Question 1 of 31048

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🔍 Key Concepts

• Four-stroke diesel engine cycle and how many crankshaft degrees occur in one full cycle • How to read a polar timing diagram for valve and combustion events • Relationship between intake, compression, power, and exhaust strokes and crank angle duration

💭 Think About

• First, determine how many crankshaft degrees make up one complete engine cycle for this type of diesel engine, then how many degrees each main stroke would ideally occupy • Look closely at the polar timing diagram: where is the 103° arc located in relation to top dead center (TDC) and bottom dead center (BDC)? • Ask yourself whether the 103° segment matches a full stroke, or a part of a stroke such as valve opening/closing or fuel injection

✅ Before You Answer

• Verify from the diagram which colored/marked arc is labeled 103° and what event name is directly associated with that arc • Confirm whether the engine shown is a four-stroke or two-stroke diesel, as this changes the degrees per stroke • Check if the 103° duration is centered around TDC/BDC or offset, which will tell you whether it is more likely intake, compression, power, or exhaust related