As shown in the illustrated electric...

Question 1 / 2066636eed28f7522a1c51db12

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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🔍 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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Question 1 of 20

The respective shaft speed sensors alone are used to achieve identical shaft speeds without regard to propeller position to achieve even power development.

The respective shaft speed and shaft position sensors are used to achieve identical shaft speeds and propeller synchronization to minimize shaft vibration.

Cavitation sensors are used to achieve identical shaft speeds and propeller synchronization to minimize vibration.

Question 1 / 2066636eed28f7522a1c51db12

Question 1 of 2066636eed28f7522a1c51db12

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Question 1 of 20

66636eed28f7522a1c51db12

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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