AME Unit 1 Alloys, Metals, Stainless Steel, Materials of Components Flashcards

AME Unit 1 Alloys, Metals, Stainless Steel, Materials of Components

Question: With reference to solder, what is the approximate percentage composition and a common application on board a marine vessel?

C. 63% tin, 37% lead; used for electrical connections  

Question: Which of the following pairs correctly match a stainless steel grade (304 or 316) with two typical applications found on a modern marine vessel?

B. 304: Interior fittings, railings; 316: Hull components, bilge pumps

Question: What is one common use of martensitic stainless steel?

B. Surgical instruments

Question: Which material is most suitable for a 300mm diameter seawater cooling pipe on a marine vessel and why?

B. Copper-nickel alloy: Due to its excellent corrosion resistance and heat transfer properties.

Question: What is the main difference between stainless steel grades 304 and 316, and how is it achieved?

C. 316 has added molybdenum, enhancing corrosion resistance.

Question: With reference to duralumin, what is the approximate percentage composition and a common application on board a marine vessel?

C. 93% aluminum, 4% copper, 3% magnesium; used for superstructure components

Question: What is an alloy and why are they used?

B. An alloy is a mixture of two or more metals or a metal and other elements. Alloys are used to create materials with specific properties not found in pure metals.

Question: How do the mechanical properties of steel change with increasing carbon content?

B. Strength increases while ductility decreases with increasing carbon content.

With reference to ship’s side valves:

state, with reasons, THREE suitable materials.

B. Bronze, stainless steel, and ductile iron: Due to their combination of strength, corrosion resistance, and durability.

Question: Which material is most suitable for a centrifugal pump impeller in marine applications and why?

C. Stainless steel: Due to its high strength and corrosion resistance.

Question: Which of the following are common alloying elements used in steel production?

A. Carbon, silicon, manganese, chromium, nickel, and molybdenum.

Question: What is one common use of ferritic stainless steel?

B. Kitchen sinks  

Question: What is stainless steel and what are its two main constituents and their approximate percentages?

A. Stainless steel is an iron alloy containing at least 10% chromium and 8% nickel.

Question: Which material is most suitable for a seawater-cooled heat exchanger on a marine vessel and why?

B. Copper-nickel alloy: Due to its excellent corrosion resistance and heat transfer properties.

Question: Which material is most suitable for a cylinder head of a small auxiliary engine on a marine vessel?

A. Cast iron: Due to its high strength and heat resistance.  

Question: With reference to cupro-nickel, what is the approximate percentage composition and a common application on board a marine vessel?

B. 90% copper, 10% nickel; used for heat exchanger tubes  

Question: What are the three main constituents of austenitic stainless steel and their approximate percentage compositions?

A. Iron (60-70%), Chromium (16-18%), Nickel (8-10%)

Question: With reference to admiralty brass, what is the approximate percentage composition and a common application on board a marine vessel?

B. 70% copper, 29% zinc, 1% tin; used for heat exchanger tubes

Question: What is one common use of austenitic stainless steel?

B. Kitchen cutlery

Question: Why is grey cast iron generally unsuitable for ship's side valves?

D. Grey cast iron is brittle and susceptible to fracture under marine conditions.

Question: Which material is most suitable for a large motor marine vessel propeller and why?

B. Bronze: Due to its corrosion resistance and good bearing properties.

Question: With reference to aluminium bronze, what is the approximate percentage composition and a common application on board a marine vessel?

A. 90% copper, 10% aluminum; used for propeller blades
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