As shown in the illustrated electric...

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Question 1 of 2066636eed28f7522a1c51db12

As shown in the illustrated electric propulsion control scheme for a twin screw vessel, when the two shaft speeds are within 5% of each other, the bridge may select "shaft synchro-phasing mode". What statement is true regarding the purpose of this operating mode? Illustration EL-0168

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Question 1 of 20

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🔍 Key Concepts

• Study the dashed feedback lines in the diagram and note which sensors/signals are actually shown for each shaft. • Think about what synchro-phasing means in a twin-screw arrangement: it involves both shaft speed and the angular position of the propellers relative to each other. • Consider how matching both speed and angular position of the shafts can affect vibration and noise in the hull.

💭 Think About

• From the illustration, identify which specific sensor signals go back to the control systems. Do you see cavitation or vibration sensors drawn anywhere? • Ask yourself: Is the goal of synchro-phasing mainly to make power output exactly equal, or to reduce mechanical effects like torsional vibration and hull noise? • Compare the choices: which one best matches both the type of sensors actually shown and the realistic purpose of keeping two shafts synchronized in phase?

✅ Before You Answer

• Verify which feedback signals are explicitly labeled in the figure: shaft speed signal and shaft position signal are they present? • Confirm whether any cavitation or vibration sensors are indicated anywhere in the schematic. • Make sure the statement you pick matches both: (1) the sensors that are really in the drawing, and (2) the logical purpose of synchro-phasing on twin shafts (what problem it is trying to minimize?).

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