Where a propeller shaft passes through the...

Question 1 / 2707066636eec28f7522a1c51c7e3

Question 1 of 2707066636eec28f7522a1c51c7e3

Where a propeller shaft passes through the hull, which device prevents water from entering the hull?

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Question 1 of 27070

Q

Where a propeller shaft passes through the hull, which device prevents water from entering the hull?

🔍 Key Concepts

• Know what part of the ship the propeller shaft is and how it exits the hull • Understand which fittings are used specifically to seal moving shafts versus sealing static joints in the hull • Differentiate between valves on sea inlets and sealing devices around rotating machinery

💭 Think About

• Which option is designed to allow a rotating shaft to pass through a watertight boundary while keeping water out? • Which item on the list is more likely to be found on a sea inlet or discharge line rather than around a shaft? • Think about which item is associated with propeller assemblies outside the hull rather than the hull penetration itself.

✅ Before You Answer

• Identify which device is used where a moving shaft passes through a bulkhead or hull • Eliminate any option that is mainly a valve on a pipeline rather than a shaft seal • Confirm which option is typically packed with material (like flax or synthetic packing) that can be tightened to control leakage

Question 1 of 27070

Q

Where a propeller shaft passes through the hull, which device prevents water from entering the hull?

A

Stuffing box

B

Stop-water

C

Sea cock

D

Propeller boss

Question 1 / 2707066636eec28f7522a1c51c7e3

Question 1 of 2707066636eec28f7522a1c51c7e3

Where a propeller shaft passes through the hull, which device prevents water from entering the hull?

Back

Question 1 of 27070

Q

Where a propeller shaft passes through the hull, which device prevents water from entering the hull?

🔍 Key Concepts

• Know what part of the ship the propeller shaft is and how it exits the hull • Understand which fittings are used specifically to seal moving shafts versus sealing static joints in the hull • Differentiate between valves on sea inlets and sealing devices around rotating machinery

💭 Think About

• Which option is designed to allow a rotating shaft to pass through a watertight boundary while keeping water out? • Which item on the list is more likely to be found on a sea inlet or discharge line rather than around a shaft? • Think about which item is associated with propeller assemblies outside the hull rather than the hull penetration itself.

✅ Before You Answer

• Identify which device is used where a moving shaft passes through a bulkhead or hull • Eliminate any option that is mainly a valve on a pipeline rather than a shaft seal • Confirm which option is typically packed with material (like flax or synthetic packing) that can be tightened to control leakage