Aux 1 Unit 11 Q14

Correct Answer: B) To ensure that the shaft runs smoothly without causing excessive wear or vibration, which could lead to damage to the bearings and other components

Explanation: Checking the alignment of the propeller transmission shaft system ensures that the shaft runs smoothly, minimizing wear and vibration. Proper alignment is crucial to prevent damage to the bearings and other components, ensuring the longevity of the system.

Correct Answer: B) A dial gauge or laser alignment tool

Explanation: A dial gauge or laser alignment tool is commonly used to measure the alignment of a propeller shaft. These tools provide precise measurements of the shaft's position relative to the bearings and other reference points, helping to identify any misalignment.

Correct Answer: B) By rotating the shaft and measuring the runout at different points along its length

Explanation: The alignment of a propeller shaft is typically checked by rotating the shaft and measuring the runout (deviation from the true center) at different points along its length using a dial gauge. This method helps identify any areas where the shaft may be misaligned.

Correct Answer: A) To ensure that the shaft is centered and evenly supported by the bearings, preventing uneven wear and potential bearing failure

Explanation: Checking the alignment of the propeller shaft with the bearings ensures that the shaft is centered and evenly supported. Proper alignment prevents uneven wear on the bearings and reduces the risk of bearing failure.

Correct Answer: B) To ensure that the shaft and associated components are properly aligned and that any potential misalignment introduced during installation or maintenance is corrected

Explanation: After installation or major maintenance, it's important to check the alignment to ensure that the shaft and components are correctly aligned. This helps prevent issues related to misalignment, such as excessive vibration, wear, and potential damage to the system.

Correct Answer: B) Comparing the measurements against manufacturer’s specifications or alignment tolerances

Explanation: Once alignment measurements are taken, they are compared against the manufacturer's specifications or alignment tolerances. This comparison ensures that the shaft alignment is within acceptable limits, preventing operational issues.

Correct Answer: B) It provides precise and quick measurements with minimal human error, making it more efficient and reliable.

Explanation: Laser alignment tools provide precise and quick measurements, reducing the potential for human error. This method is more efficient and reliable compared to traditional methods, especially for complex alignment tasks.

Correct Answer: B) Excessive vibration, bearing wear, and potential failure of the shaft or connected components

Explanation: Failure to properly align a propeller shaft can result in excessive vibration, bearing wear, and potentially catastrophic failure of the shaft or connected components. Proper alignment is critical to the safe and efficient operation of the propulsion system.

Correct Answer: B) Excessive vibration or noise coming from the bearing area

Explanation: Excessive vibration or noise coming from the bearing area is a primary indication of a high bearing. These symptoms suggest that the bearing is experiencing excessive load or misalignment, which could lead to failure if not addressed.

Correct Answer: B) Elevated bearing temperature, indicating that the bearing is under more stress than normal

Explanation: An elevated bearing temperature is another key indication that a bearing is running high. High temperatures can indicate that the bearing is under more stress than normal, possibly due to misalignment or excessive loading.