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Mechanical Engineering - Engineering Materials

Exercise : Engineering Materials - Section 3
31.
Duralumin contains
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
3.5 to 4.5% copper, 1.2 to 1.7% managanese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
5 to 6% tin, 2 to 3% copper and rest aluminium
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
Age hardening is related to
duralumin
brass
copper
silver
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
The addition of which of the following improves machining of copper?
Sulphur
Vanadium
Tin
Zinc
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
When a medium carbon steel is heated to coarsening temperature,
there is no change in grain size
the average grain size is a minimum
the grain size increases very rapidly
the grain size first increases and then decreases very rapidly
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Phosphorus is added in low carbon steels to raise its yield point.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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