The multi-purpose supply vessel to which you...

Question 1 / 2066636eef28f7522a1c51ff5a

Question 1 of 2066636eef28f7522a1c51ff5a

The multi-purpose supply vessel to which you are assigned is fitted with main propulsion reduction gears as shown in the illustration. What statement is true concerning this type of reduction gear? Illustration MO-0142

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🔍 Key Concepts

• Fixed pitch vs controllable pitch propellers and how direction of thrust is changed for each type • Reversing vs non-reversing engines and what additional gearing/clutches are needed • Role of forward and reverse clutches in a reduction gear, as shown in the illustration

💭 Think About

• Look at the engine rotation arrows in both views A and B. Does the engine ever change direction, or does only the gear train change which way the shaft turns? • If the gear has separate forward and reverse clutches and pinions, what does that tell you about how the vessel goes astern? Through changing shaft direction, or changing blade pitch? • Ask yourself: if propeller pitch could be changed to get astern thrust, would you still need a full reverse gear train like the one shown?

✅ Before You Answer

• Verify whether the engine rotation direction is the same in both forward and reverse diagrams • Note that the propulsion shaft flange actually changes rotation direction between A and B, and ask what kind of propeller needs the shaft to reverse to go astern • Confirm whether there is any sign of a pitch-control mechanism in the illustration, or only clutches and gears for ahead/astern selection

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Question 1 of 20

This type of reduction gear is used with a fixed pitch propeller and a reversing engine.

This type of reduction gear is used with a fixed pitch propeller and a non-reversing engine.

This type of reduction gear is used with a controllable pitch propeller and a non-reversing engine.

This type of reduction gear is used with a controllable pitch propeller and a reversing engine.

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Question 1 / 2066636eef28f7522a1c51ff5a

Question 1 of 2066636eef28f7522a1c51ff5a

Back

Question 1 of 20

66636eef28f7522a1c51ff5a

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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