materiales Senasa modulo 6 parte 2

What is a Rockwell tester used for. Hardness Testing. Tensile Testing.

What type of test involves using a weighted pendulum to strike a material until fracture?. Hardness Test. Impact Resistance Test.

Which of the folllowing are all hardness testing machines. Rockwell, Vickers and Izod. Rockwell, Brinell and Vickers.

The most suitable mixture for a salt bath operation is. 20% nitrate of soda and 80% sodium nitrate. 90% nitrate of soda and 10% sodium nitrate.

How many times can clad alloy be heat treated?. Once only. 3 times.

The symbol 'W' on a material indicates. it is for use on aircraft mainplanes only. it has been solution treated and will respond effectively to precipitation treatment.

For a particular metal material, what conditions are best to minimise creep?. Low stress, low temperature. High stress, low temperature.

What is the effect of precipitation heat treatment on aluminium?. It speeds up age hardening process. It softens the material to allow it to be worked.

Aluminium exposed to air will. oxidise and become weaker. oxidise and become electrically insulated.

What care should you take with 2024-T3?. Do not scratch or make nicks in it. Do not remove the surface of the sheet metal.

Composition of silver solder is. tin, lead and silver. tin, lead, silver and antimony.

If aluminium alloy is not quenched within the minimum time allowed after heat treatment is it will be. subject to corrosion. brittle.

Anodizing protects alloy metal from corrosion and does what else?. Seals the surface from moisture. Makes a good surface for paint to adhere to.

If caustic soda turns a material black what is it?. Aluminium alloy. Aluminium.

What chemical is used to identify aluminium alloys?. Caustic soda. Copper sulphate.

Pure aluminium is. highly resistant to corrosion. not resistant to corrosion.

Precipitation treating makes the metal. harder, stronger and less ductile. less strong and hard.

A material has the code 2024-TH6 on it. Which part of the code indicates the percentage of the alloying element?. H. 20.

Aluminium alloyed primarily with magnesium is numbered. 2025. 5025.

Non heat treatable materials. can be hardened by strain hardening or cold working. can be hardened by annealing.

Which of the following metals is an aluminium silicon alloy used mainly for casting?. Alclad. Alpax.

Aircraft skin is joggled to. provide smooth airflow at faying surfaces. make a frame lighter but stronger.

In a sheet metal store the following is marked on a sheet of aluminium alloy: L162 (sheet 1). , On a different sheet the following marking is found: L172 (sheet 2). The following is true: Sheet one is more ductile than sheet 2. Sheet two is of a thicker gauge than sheet 1.

Cold working of a material is used to reduce. wear of manufacturing tools. material hardness.

Sheet metal should be stored. above 25 degrees centigrade. on its edge in racks to prevent scratching.

Clad aluminium alloy (alclad) has a pure aluminium coating of. 5% of alloy thickness. 1% of alloy thickness.

The main metal in monel is. aluminium. nickel.

A tube complying to BS T51 is. tungum. high pressure seamless copper tube.

Why is nickel chromium used in many exhaust systems?. Lightweight and flexible. Corrosion resistant and low expansion coefficient.

Titanium alloys. are cheap to manufacture. have a high strength to weight ratio.

Clad aluminium alloys are used in aircraft because they. are harder wearing than unclad aluminium alloys. are less subject to corrosion than uncoated aluminium alloys.

Non heat treatable aluminium alloys. can be hardened by strain hardening. cannot be softened.

Solution treatment after manufacturers have performed it once can be carried out a further. 1 time. 2 times.

Following solution treatment aluminium alloy can be placed into service. after 5 days. after 24 hours.

The time between removal from heat treatment furnace and quenching must be not more than. 3 seconds. 10 seconds.

When buffing surface of Aluminium Alloy, what material are you removing?. Oxide layer. Aluminium.

Why is clad alloy preferred to pure Aluminium?. Less brittle. Tougher.

Why are aluminium alloys used on aircraft, instead of pure aluminium?. Stronger. Corrosion resistant.

The magnesium alloys used in aircraft can be recognized by. shiny surface due to chromium plated on the surface. yellowish surface due to protective treatment.

Age hardening of aluminium is. never carried out. a gradual hardening over a period of time.

Alclad is. duralumin with aluminium coating. duralumin with magnesium cladding.

The oxide film on the surface of aluminium is. hard and porous. non porous.

The process of forming a pure layer of aluminium over an aluminium alloy is. metalizing. cladding.

Titanium can be identified by placing it on a grinding wheel and looking for. White Sparks. Yellow Sparks.

The critical process of heat treatment is. temperature, method of heating and cooling. method of heating only.

Re-treatment of aluminium alloys can be performed by. alocrom treatment. brushing on phosphate treatment followed by paint.

What is generally true for titanium alloy?. It is stronger than the aluminium. It is stronger than the steel.

Malleable materials are. easy to forge. easy to cast.

If a material has to undergo deep cold forming operation. The essential property would be. ductility. malleability.

The metal which must not be heated in a salt bath is. magnesium alloy. duralumin.