PASGT Final Req

What is the primary function of a stern tube seal?

• To cool the propeller shaft

• To prevent seawater ingress and contain lubricant

• To provide propulsion for the ship

• To align the engine with the shaft

Which of the following is a key component of a lip seal system?

• Dual mechanical seals

• Water supply system

• Flexible rubber or elastomeric lip

• Oil reservoir

In which environment are lip seals most effective?

• High-pressure environments

• Low-pressure and low-risk environments

• Harsh operating conditions

• Environments with high temperatures

What is a common problem with lip seals?

• Overheating of the seals

• Water leakage due to wear and tear

• Inadequate lubrication system

• Vibration due to misalignment

What is a primary advantage of the double-acting mechanical seal?

• Low cost and easy maintenance

• Excellent performance under extreme conditions

• Environmentally friendly design

• Low risk of contamination

What causes heat buildup in a double-acting mechanical seal system?

• Inadequate lubrication

• Water ingress

• Shaft misalignment

• Low pressure

Which stern tube system eliminates the need for oil-based lubricants?

• Lip seal system

• Double-acting mechanical seal

• Water-lubricated system

• Oil-lubricated system

Which of the following is a disadvantage of water-lubricated stern tube seals?

• High environmental risk

• Vulnerability to contamination

• High maintenance cost

• Excessive heat buildup

What is the primary advantage of an oil-lubricated stern tube seal system?

• Reduced wear and friction on shaft bearings

• Lower environmental impact

• Simplicity and low cost

• Low maintenance requirements

What is a common problem with oil-lubricated stern tube seals?

• Oil leakage

• Shaft misalignment

• Seal face wear

• Inadequate water flow