What provisions are generally made to reduce the noise and vibration emanating from the propulsion machinery installation, especially on passenger ships?

Correct Answer: Option D — The propulsion machinery is resiliently mounted to machinery beds integral to the double- bottom structure, and power is transmitted with use of flexible couplings.

To minimize noise and vibration transmission, propulsion machinery is resiliently mounted on vibration-dampening foundations. Flexible couplings are essential in this configuration to accommodate the relative movement between the resiliently mounted engine and the rigid shafting, preventing mechanical stress and ensuring smooth power transmission to the propeller.