Material Science DJJ3213

.................. is a process of metal reduction from the conditions that can be used to the conditions that cannot be used.

• Corrosion

• Vibration

• Tension

• Pollution

Which of the following is TRUE about dry corrosion

• Also known as direct oxidation corrosion

• Also known as electrochemical corrosion

• Causes metal to damage slowly but effectively

• Involves the position of metal in the electrochemical series

Wet corrosion would only occur with the presence of .................

• heat

• electricity

• moisture

• air

Listed below are non-ferrous metals EXCEPT ..............

• aluminium

• zinc

• hydrogen

• copper

Listed below are the types of cast iron EXCEPT ................

• grey cast iron

• white cast iron

• black cast iron

• nodular cast iron

The charasteristics of stainless steel are determined by ...............

• resistance

• high stress

• cobalt content

• chromium content

What is the application of cast iron?

• Car body

• Engine blocks

• Bridge

• Hammer

Commercially pure iron contains up to 0.008% C and steel up to 2% C.

What are the carbon content in Cast iron?

• More than 2% C

• Up to 4% C

• Up to 10% C

• Up to 7% C

Which of the following statement below is an example of corrosion remedial action in designs?

• Bolts and rivets should be replaced by proper welding.

• Use of corrosion resistant alloys.

• Plastic and oil are use mainly for coatings.

• Chromium is added to the steel to enhance its corrosion resistant properties.

Low alloy steel can be listed as below EXCEPT

• Medium carbon steel

• High carbon steel

• Moderate carbon steel

• Low carbon steel