Exam Question
Describe materials used for following equipments with composition and qualities required.
(a) Propeller (4)
(b) Propeller Shaft. (4)
(c) Engine Gears. (4)
(d) Bearings. (4)
Class 4 (4th Engineer)
MEP
📅 Jul 2023
Reference Answer
### (a) Propeller
**1. Materials and Composition:**
Marine propellers are primarily constructed from high-strength alloys designed to withstand the harsh marine environment. The most common material is a Nickel-Aluminium Bronze (NAB) alloy, with other materials like Manganese Bronze and stainless steel also being used.
* **Nickel-Aluminium Bronze (NAB):** This is the industry standard for most commercial vessels.
**1. Materials and Composition:**
Marine propellers are primarily constructed from high-strength alloys designed to withstand the harsh marine environment. The most common material is a Nickel-Aluminium Bronze (NAB) alloy, with other materials like Manganese Bronze and stainless steel also being used.
* **Nickel-Aluminium Bronze (NAB):** This is the industry standard for most commercial vessels.
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