MATERIAL SCIENCE - Practice Mode

1) What metals contained in brass alloy?

Copper and aluminium Copper and lead Copper and zinc Copper and tin

Correct Answer: Copper and zinc

2) Which cast iron cannot be welded?

Grey cast iron White cast iron Malleable cast iron Nodular cast iron

Correct Answer: White cast iron

Explanation:

Austenitic grades of stainless steels tend to be the most weldable, but they are especially susceptible to distortion due to their high coefficient of thermal expansion. Some alloys of this type are prone to cracking and reduced corrosion resistance as well. Hot cracking is possible if the amount of ferrite in the weld is not controlled—to alleviate the problem, an electrode is used that deposits a weld metal containing a small amount of ferrite. Other types of stainless steels, such as ferritic and martensitic stainless steels, are not as easily welded, and must often be preheated and welded with special electrodes.

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MATERIAL SCIENCE - Practice Mode

1) What metals contained in brass alloy?

2) Which cast iron cannot be welded?

Explanation:

3) Which metal cannot be forged?

4) Which metal is widely used for making casting of machinery parts?

5) Which furnace is used to get pig iron from iron ore?